AVSS PRS-M350 Parachute Recovery System User Manual

: June 15, 2024
: AVSS

PRS-M350 for DJI M350 RTK
Version 1.1

PRS-M350 Parachute Recovery System

PRS-M350(EX) USER MANUAL FOR DJI M350 RTK
Using this Manual

1. Revision Notes

Revision #	Date	Revision Description
1.0	October 4, 2023	– Initial Internal Release
1.1	October 19, 2023	– Added Firmware Update Procedure in Appendix C.3

for PRS-M300 Compatibility

2. Legends
Warning
Important
Tips
FOR THE MOST RECENT VERSION OF THE USER MANUAL, PLEASE GO TO: https://www.avss.co/products/prs-for-dji-M350-rtk/

Disclaimer

You must read the ENTIRE user manual to become familiar with the features of this product before operation. Failure to operate the product as instructed by the user manual may result in damage to the product or personal property and can cause serious injury. Failure to operate the product as instructed may also void your warranty.
This is product has been designed for and should only be used by qualified professionals only.1
This product is designed to increase the safety of both people and property on the ground during DJI M350 RTK operations while potentially helping DJI M350 RTK operators meet compliance requirements. However, this product is not a replacement for safe operating practices and should serve only as a last resort in the event of an emergency.
Before use, you shall refer to the DJI M350 RTK manufacturers’ documentation to determine if this product complies with specific operating requirements and warranty conditions of the DJI M350 RTK. Failure to comply with the operating requirements of this product and/or DJI M350 RTK manufacturer product may result in damage to the DJI M350 RTK, damage to nearby property, harm to bystanders, and/or cause serious injury.
Always use proper judgment when attempting to mitigate risks and/or danger in emergencies. Do not make or attempt any alterations or adjustments to this product or its use as it could result in serious injury, or damage to the product or other property and it will void the warranty.
AVSS – Aerial Vehicle Safety Solutions Inc. (AVSS) assumes no liability and/or ownership of any failure event that may occur while the system is attached to a DJI M350 RTK. The use of AVSS products is at the risk of the user.
Do not store the PRS-M350 and/or any of the associated parts and accessories in any extreme cold, hot or humid environments.
- Less than 3 months: -20° to +45° C
- More than 3 months: +22° to +28° C
This document and the information contained herein are proprietary and commercially confidential to AVSS. It is prohibited to use, disclose, reproduce, distribute, or use this user manual other than persons for which purchased the product.

**** THIS USER MANUAL MAY BE UPDATED AT ANY POINT AND WITHOUT NOTIFICATION. BEFORE USE, READ, IN ITS ENTIRETY, THE MOST RECENT VERSION OF THIS USER MANUAL TO UNDERSTAND ALL PROCEDURES, RISKS, AND RESTRICTIONS ASSOCIATED WITH THIS PRODUCT BEFORE OPERATING.

Terms, Acronyms, & Abbreviations

| Terms & Definitions
---|---
AGL| Above Ground Level.
ATS| Autonomous Triggering System that is independent of any flight critical system of the DJI M350 RTK that will detect and initiate parachute deployment upon detection of a critical failure of the DJI M350 RTK during flight.
Authorized Dealer| An AVSS approved distribution partner who sells the PRS-M350.
Drone| When referring to a DJI M350 RTK, other relevant terms include Aircraft, RPAS, sUAS, UAS, and UAV.
End-User| The owner of the PRS-M350 who had purchased the system from an AVSS Authorized Dealer.
FTS| Flight Termination System is a device that will disable the propulsion system of the DJI M350 RTK.
IP Rating| Ingress Protection Rating.
LiPo| Lithium-Polymer (Chemistry of battery).
Manual Triggering Device| The manual triggering device, initiated by pressing the triggering button, initiates the deployment of the parachute recovery system at the discretion of the pilot in command.
Minimum Deployable Altitude| The lowest altitude at which the PRS-M350 is rated to deploy successfully.
Parachute Pod™| This refers to the replaceable Parachute Pod™ that contains the parachute of the AVSS PRS-M350.
Position Mode| The PRS-M350 shall be used only in N-mode (Normal): N-mode works best when the GPS signal is strong. The DJI M350 RTK utilizes GPS and Forward and Downward Vision Systems to locate itself, automatically stabilize, and navigate between obstacles. Complete details can be found at www.DJI.com .
PRS| Parachute Recovery System.
Shall| “shall” versus “should” versus “may”, v—use of the word “shall” implies that a procedure or statement is mandatory and shall be followed to comply with this specification, “should” implies recommended, and “may” implies optional at the discretion of the supplier, manufacturer, or operator.

Safety Instructions

Eye Protection| As with any system designed to launch a mass at high velocity, precautions shall be taken to prevent potential injury.
---|---
Never point the Parachute Pod™ towards anyone or
anything| While the PRS-M350 includes features to prevent unintentional deployments, users shall be aware that the Parachute Pod™ is launched vertically. It is recommended that the operator maintains a clear area of at least 5 meters after the system has been powered.
Disarming Manual Trigger Device| Always disarm the Manual Trigger Device before approaching the DJI M350 RTK after a landing or in the event of an aborted takeoff.
Ensure PRS-M350 is DISARMED before moving it| Do not pick up the PRS-M350 when it is armed because the sensors may interpret the movements as an in-flight failure. Wait five to ten seconds for the Autonomous Trigger System to disarm.
Error Status| The system should not be used unless it is indicated that no errors are present. The system will not arm itself nor deploy in a failure scenario unless it has initialized successfully.
Low Battery| The PRS-M350 requires enough battery power to operate. Although the PRSM350 can draw power from the DJI M350 RTK as a backup if the battery becomes low during a flight, this feature is not to be used as a substitute for
charging the battery prior to flight.
Parachute Pod™ Repacking| Only parachutes packed by AVSS are compliant. The Parachute Pod™ shall be repacked or replaced annually only by AVSS. You will no longer be compliant and will void the warranty if you attempt or repack the Parachute Pod™.
Payload Configuration| Always follow DJI’s maximum specified takeoff weight when adding payloads to the DJI M350 RTK (See Compatibility & Payloads sub- section for a list of compatible payload configurations).
Position Mode and Flight Mode Changes| The Autonomous Triggering System is designed to automatically detect abnormal flight behaviors. Flying in a controlled manner and avoiding erratic maneuvers ensures that the PRS-M350 can more accurately distinguish
between pilot commands and loss of control. Do not change the flight mode mid- flight as the DJI M350 RTK can have a hard/abrupt braking maneuver that can exceed the maximum “30°-degree pitch angle (N-mode, Forward Vision System enabled: 25°)”2.
Rules and Regulations| Pilots shall follow the rules and regulations put in place by civil aviation or government bodies in their operating regions.
Li-Po Battery Warning| The PRS-M350 utilizes Li-Po batteries. Li-Po batteries are volatile and can cause fires. The user must take the necessary precautions when charging the PRSM350.

Limitations

1. Operational & Environmental Conditions
– DJI M350 RTK Flight Mode = N Mode
– DJI M350 RTK Maximum Tilt Angle = 30° Degrees
– Maximum Take Off Weight = 9.20 kg (20.28 lbs)
– Minimum Deployable Altitude at 7.70 kg = 44.6 m (146.33 ft)
– Minimum Deployable Altitude at 9.20 kg = 50.8 m (166.67 ft)
– Autonomous Triggering System Arming Height = 43 m (141.08 ft)
– Manual Triggering Device Range = <2 km (<1.24 mi)
– Temperature Range = -20°C to +45°C (-4°F to 113°F)
– Maximum Wind Limit for EASA M2 Mitigation = 9.35 m/s (18.1 knots)
– Maximum Wind Resistance = 12 m/s (39.3 fps)

ONLY FLY THE PRS-M350 IN NORMAL (N) MODE.
DO NOT CHANGE / SWITCH FLIGHT MODES FROM NORMAL MODE TO AUTOMATED FLIGHT MODES OR AUTOMATED FLIGHT MODES TO NORMAL MODE MID FLIGHT AS THE DJI M350 RTK MAY MAKE AN ABRUPT STOP OR MANEUVER AND EXCEED THE “30°-DEGREE PITCH ANGLE (N-MODE, FORWARD VISION SYSTEM ENABLED: 25°)”.
IF YOU UPDATE THE FIRMWARE ON THE DJI M350 RTK, ALL EXISTING PRSM350 PSDK SETTINGS WILL BE REMOVED. THEREFORE, AFTER COMPLETING A FIRMWARE UPDATE, YOU MUST PERFORM THE FIRST TIME & AFTER FIRMWARE UPDATES PROCEDURES (SEE “FIRST TIME USE & AFTER FIRMWARE CONFIGURATION” SECTION)
IF THE PARACHUTE IS DEPLOYED IN HIGH WINDS, THE PARACHUTE CAN DRIFT. THE PILOT MUST CONSIDER DRIFT ZONES AND THE CONSEQUENCES IN THEIR RISK ASSESSMENT.
LEAVING THE PRS-M350 ON FOR A PROLONGED PERIOD BEFORE TAKING OFF CAN CAUSE IT TO ARM IF ENVIRONMENTAL CONDITIONS ARE CHANGING (E.G., BAROMETER DRIFT).
IF THE PRS-M350 IS INVOLVED IN A MAJOR CRASH, DO NOT REUSE THE PRSM350 WITHOUT CONTACTING AVSS’S CUSTOMER SUPPORT AND SPEAKING WITH A REPRESENTATIVE BEFORE THE NEXT FLIGHT.

PRS-M350 Overview

The PRS-M350 is composed of five (5) main components:

The Electronics Module, which houses the battery, sensors, radio, and controller. These electronics also control the autonomous triggering system that will deploy the parachute.
The swappable Parachute Pod™, which contains a compressed spring and a folded parachute.
The Flight Termination System Module, a cable adapter and module that enables the Electronics Module to communicate with the DJI M350 RTK’s PSDK for motor shutoff.
The Bracket, which attaches the PRS-M350 to the DJI M350 RTK and allows for easy removal.
The Manual Triggering Device, which allows the user to manually initiate a parachute deployment when desired by pressing on the red triggering button.

1. First Time Setup
When the user receives the product, the Electronics module comes mounted to the top plate of the bracket with a Parachute Pod™ already attached. For a first-time installation, the user must remove the landing gear brackets on the DJI M350 RTK, place an aluminum spacer block in between and remount the landing gear bracket with the longer bolts that are provided by AVSS. This spacer block can stay permanently attached to the aircraft and ensures that the DJI M350 RTK can still fit in the official DJI M350 RTK supplied hard case. The user must then enable the PSDK on the DJI M350 RTK to allow the FTS to work, which is done using DJI Assistant software.
2. General Use
To use the PRS-M350 for a flight, the DJI M350 RTK can be unpacked from its case and set up according to DJI’s user manual. Once the aircraft is in its flight configuration, the AVSS bracket can be mounted to the DJI M350 RTK. The bracket side plates connect and lock into the spacer blocks. The bracket top plate which already has the electronics module and Parachute PodTM attached can then be mounted and locked in place using a combination of a sliding motion and quarter turn fasteners. The provided FTS Module can then be plugged into the PSDK port on the DJI M350 RTK and connects to the electronics module using the provided cable that features locking connectors. The PRS-M350 is now fully installed. The PRS-M350 will turn on automatically when the DJI M350 RTK is turned on. The manual triggering device is turned on by the user to ensure that it is communicating with the PRS-M350. The manual triggering device has a secondary arm button that must be held down for two (2) seconds to arm the manual triggering device before the parachute can be manually deployed. Any error with the PRS-M350 will be communicated to the user via the manual triggering device in the form of verbal warnings and a status LED. During the flight, the PRS-M350 Autonomous Triggering System will arm itself only once it has reached the minimum deployable barometric altitude. Afterward, if the DJI M350 RTK experiences a failure, using a combination of accelerometer, gyro, and barometer data, the Autonomous Triggering System detects the failure, forces the motors to shutoff, and deploys the parachute without the need for pilot input. If the DJI M350 RTK experiences a flyaway, loss of communication, or other undesirable behavior, the pilot can manually trigger the parachute deployment to safely recover the aircraft.

Features, Specifications, Testing, & Compatibility

The PRS-M350 has been designed to easily integrate with DJI Matrice 350 RTK (DJI M350 RTK). The attachment bracket secures the PRS-M350 without interfering with onboard sensors and can be easily removed for transport. The system includes an electronic module to power the Parachute Pod™ and flight termination system. The flight termination system is initiated when either the pilot instigates a deployment through the manual triggering device or when the Autonomous triggering system, using the onboard sensors located in the electronic module, determine that the DJI M350 RTK has breached the safe flying parameters. Once the flight termination system is initiated and stops the motors from spinning, the Parachute Pod™ is deployed and will result in the DJI M350 RTK descending under a fully inflated parachute.
1. Features

Attachment Bracket| The custom mounting bracket allows the PRS-M350 to be easily installed with minimal effort.
---|---
Independent Power Source| The PRS-M350 is equipped with an independent power source that allows the system to deploy if the DJI M350 RTK loses power.
Spring-Based Ejection| A high-energy spring is used to eject the parachute. This non-pyrotechnic system is safe for travel on commercial airlines.
Autonomous Trigger System| The Autonomous Triggering System (ATS) automatically detects failures and triggers the parachute release.
Manual Triggering Device| The manual triggering device can initiate deployment of the parachute recovery system at the discretion of the remote pilot in command.
Flight Termination System| Plug-and-play system that cuts power to the motors in the event of a failure and to ensure that the parachute does not become entangled in the DJI M350 RTK’s propellers.
Audible Buzzer| An audible buzzer on the DJI M350 RTK will attempt to notify bystanders that the PRS-M350 has deployed and the DJI M350 RTK is descending.
Low Descent Rate| The parachute is designed to greatly reduce the descent velocity of the DJI M350 RTK in the event of a failure.
Flight Data Logging| Flight data logging to a dedicated microSD Card that is integrated in the PRS- M350.
Parachute Pods™| Easily replaceable Parachute Pod™.

2. Specifications

OVERVIEW 3|
---|---
Total Weight| 922 grams (2.03 lbs)
  Average Descent Rate (7.70 kg)| 3.24 m/s (10.62 fps)
Average Descent Rate (9.20 kg)| 3.54 m/s (11.61 fps)
  Average Impact Energy (7.70 kg)| 40.30 Joules (29.80 ft-lb)
Average Impact Energy (9.20 kg)| 57.60 Joules (42.50 ft-lb)
  Minimum Deployable Altitude (7.70 kg)| 44.60 meters (146.33 ft)
Minimum Deployable Altitude (9.20 kg)| 50.80 meters (166.67 ft)
  Parachute Reuse Method| Prepacked Pods
Deployment Technology| Spring
Deployment Trigger| Manual and/or Autonomous
PARACHUTE RECOVERY SYSTEM
Main System Weight| 650 grams (1.43 lbs)
  Deployment Release Time| 20 ms
Time to Inflation| 0.57s to 1.30s
Battery Life| 6 hours
Operating Temperature| -20˚C to +45˚C (-4°F to 113°F)*
PARACHUTE POD™
Parachute Size| 5.5m²
  Risers/Attachment Location| Internal
FLIGHT TERMINATION SYSTEM
FTS Method| PSDK
Integration Process| PSDK Port
ATTACHMENT BRACKET
Attachment Bracket Weight| 272 grams (0.60 lbs)
Material| Carbon Fibre
Attachment Location| Top Mounted
MANUAL TRIGGERING DEVICE (REMOTE)
Range| <2 km (<1.24 mi)
Frequency| 915MHz (North America) / 868MHz (Europe)

*Recommended ambient temperature for operation only. See Battery & Charging and Maintenance and Care sections for more information.
3 Subject to change without warning based on supply chain material availability, payload selection, ongoing testing results, and environmental conditions.
3. Payloads
AVSS’s PRS-M350 typically works with the various DJI M350 RTK payload options that are provided by DJI and that have been developed to integrate through the DJI PSDK Port. As of 2020-10-01, the following payload combinations, if using the user manual data located on DJI’s and payload partners’ website 4, are within the 9.0kg Maximum Take-Off Weight criteria. Be aware, due to the potential unannounced changes by the supporting DJI M350 RTK and payload manufacturers, these charts are subject to change without any notification. The user is solely responsible for verifying the weight inaccuracies and calculating the weight of additional items attached to the DJI M350 RTK.
Single Payload Configuration Chart

Single Payload (KG)

Drone| Battery| H20| H20T| Z30| XT S| XT2| U10 Methane| Z15
0.686| 0.833| 0.556| 0.387| 0.629| 0.534| .500
DJI M350 RTK| TB60/TB65| 7.908| 8.055| 7.778| 7.609| 7.851| 7.756| 7.722
Available Weight (MaxTOW 9kg)| 1.092| 0.945| 1.222| 1.391| 1.149| 1.244| 1.278

Dual Payload Configuration Chart

Dual Payload (KG)

Drone| __Battery| H20T + Z30| H20T + XT S| H20T + XT2| H20T + U10 Methane| H20T + Z15
1.389| 1.220| 1.462| 1.367| 1.333
DJI M350 RTK| TB60/TB65| 8.611| 8.442| 8.684| 8.589| 8.555
Available Weight (MaxTOW 9kg)| 0.389| 0.558| 0.316| 0.411| 0.445

Warranty

AVSS warrants that the PRS-M350 and its accessories are free from defects and fit for the operational purpose intended.
The warranty period for the PRS-M350 is, the earliest of, twelve (12) months after purchase, or after three Parachute Pod™ deployments, which starts on the date listed as per the user’s invoice from an Authorized Dealer.
This warranty requires the PRS-M350 to be shipped to AVSS’s location for analysis and may either be fixed, replaced and/or deemed voided of warranty at the sole discretion of AVSS.
If the customer believes the PRS-M350 did not properly function or deployed the Parachute Pod™ in a non-failure event (False-Positive), the customer must send AVSS the following files:
PRS-M350 Data
DJI M350 RTK DAT data
DJI M350 RTK Text File
If the PRS-M350 is deemed void, the cost of analysis and shipping shall be the responsibility of the end-user. Nothing herein contained shall be construed to exclude or limit any warranty, express or implied by law.
AVSS hereby declares that the warranty shall be deemed void if the PRS-M350 is not used for the intended operational uses and/or if alterations, tampering, or any actions deemed comprising by AVSS, directly or indirectly, of the PRS-M350 This includes, but not limited to, non-standard use, the use of potentially disabling anti-operations technology, and/or unintended damage by the end-user.
The manual triggering device for the parachute is warrantied against any manufacturing defect.
The product warranty does not cover water damage.
If the product is used or handled in any way otherwise described within this user manual, the warranty shall be void.
The PRS-M350 purpose is to assist in decreasing the ground impact energy caused by the DJI M350 RTK mid-flight failure. The end-user cannot in any circumstances from AVSS pursue any compensation or allowance if their DJI M350 RTK is damaged.
It is the responsibility of the purchaser to contact AVSS to obtain additional or updated copies of the user manual.

What’s in the Box:

1. Parts Included A. Parachute Pod™
B. FTS Connector
C. Electronic Module
D. Top Plate
E. Side Brackets (2)
F. Bracket Leg Connectors (2)
G. FTS PSDK Module
H. HR30 FTS Cable
I. Manual Trigger Device with Battery
J. Allen Keys
K. USB-C to USB-A Cable
L. M6 Bolt and Washer (2)

System Overview

1. Parachute Recovery System
A. Parachute Pod™
B. Electronic Module
C. MicroSD Dust Cap for the USB/microSD Card Slot
D. Status LED
E. Power Button
F. Firing Pin Receptacles
G. Orientation Key
H. Battery Door
I. Electrical Contacts
J. Continuity LED
K. HR30 FTS Connector
2. Attachment Bracket A. Top Plate
B. Quarter Turns (2)
C. Side Plates (2)
D. Landing Gear Screws (8)
E. Bracket Leg Connectors
3. Flight Termination System – Through PSDK
A. FTS PPSDK Module
B. HR30 FTS Cable Female Connector
C. USB-C Connector to DJI M350 RTK PSDK Port
D. HR30 FTS Cable to Electronic Module Connector
E. HR30 FTS Cable to FTS Connector
4. Manual Triggering Device A. Triggering Button
B. Antenna
C. Lanyard Attachment
D. Belt Clip
E. Arm Button
F. Status LED
G. Power Button
H. Sync Button
I. USB-C Charging Port

Installation

**** ENSURE BOTH THE PRS-M350 AND DJI M350 RTK ARE OFF DURING INSTALLATION UNLESS REQUIRED FOR COMPLETING THE STEP.
1. Electronic Module

Turning on the PRS-M350

Step 1| Turn on System| To turn on PRS-M350, press on the ON/OFF switch.|

Synchronization on PRS-M350

Step 1|

Press and Hold Sync Button

| To synchronize the PRS-M350, ensure the PRS-M350 is OFF. Next, pull the tab on the microSD dust cap cover to open it. Then, press and hold the small blue synchronization button in the top corner.|
Step 2| Turn On PRS| While holding the button, turn ON the PRS. The Main status LED should turn white after a moment.|
Step 3| Turn On Remote| Turn on the manual remote while holding the sync button that is located next to the power button. The LED on the remote will turn white.|

Step 4| Syncing| Once both the PRS and remote are on and in the sync mode (white LED), they will pair. The remote will indicate that the pair is connected and the status LED on both the PRS and the remote will green. The PRS and remote are now bound. They can now be turned off.

2. Parachute Pod™

****ONLY REMOVE THE PARACHUTE POD IF THE PARACHUTE HAS BEEN DEPLOYED.
ENSURE THAT THE PRS-M350 IS OFF BEFORE REPLACING THE POD.

Attaching and changing the Parachute Pod™

Step 1| Remove Parachute PodTM from PRS- M350| Using the supplied hex key, unscrew the M6 bolt until the pod can be removed. Do not reuse the bolt and washer when attaching a new Parachute Pod™.|
Step 2| Align New Parachute PodTM| Remove the new Parachute Pod™ from its shrink wrap packaging. Align the Parachute PodTM above the electronics module such that the electrical contacts will mate properly (as shown).|
Step 3| Press Parachute PodTM Against Module| Press the Parachute PodTM against the electronics module. The two shall mesh so that they do not slide against each other.|
Step 4| Slide Washer onto M6 Bolt| Take a new M6 bolt and slide on a new washer. The washer is slightly cone shaped. Ensure that the narrow end is towards the head of the bolt.|
Step 5| Tighten Bolt| Using the M5 hex key, tighten the bolt.|
Step 6| Power On| Place the PRS-M350 on a flat surface and turn on.|
Step 7| Check Continuity| Check that the continuity light on the side of the PRS- M350 is lit. This indicates that the electrical contacts are properly connected to the pod.|
Step 8| Power Off| Power off the module. The new Parachute PodTM is now successfully installed.|

3. Attachment Bracket
First Time Use

Bracket Leg Connectors for the DJI M350 RTK

Step 1| Attachment Bracket Leg Connectors| Unscrew and remove the M350 landing gear. Then, align the landing gear spacers to the bottom of the side brackets. Ensure the flat side of the spacers are attached to the side brackets and that the hollow middle is directed towards the M350 landing gear attachment point.|
Step 2| Screw in Landing Leg Connectors| Align the side brackets to the landing leg connectors and attach the landing gear to the outside of the side brackets. Then, screw in the provided landing gear bolts so that, in the following order, the screw is attached to the M350 landing gear, side brackets, spacers, and M350.

** THE BRACKET SYSTEM SHALL BE FIRMLY ATTACHED. WHEN THE PARACHUTE DEPLOYS, THE PARACHUTE WILL TRANSFER THE ENTIREWEIGHT OF THE DJI M350 RTK TO THE ATTACHMENT BRACKET.
Ongoing Use**

Installing the Attachment Bracket Before Use

Step 1| Spacers Prepared| After completing the first time install steps, the DJI M350 RTK and PRS-M350 are ready to be attached for flight.|
Step 2| Rear Side Plate Alignment| Standing behind the drone, take the rear side plate as shown and ensure that the foam is on the inside, orientated towards the DJI M350 RTK.|
Step 3| Rear Side Plate Insertion| Align the heel of the bracket with the slot in the spacer block.|
Step 4| Rear Side Plates| Seat the heel into the slot to form a hinge.|
Step 5| Rear Side Plates| Rotate the plate towards the back of the DJI M350 RTK until the hook latches into the block. A click should be felt/heard.|
---|---|---|---
Step 6| Front Side Plates| Take the front side plate and ensure the quarter turn twist tab is facing away from the drone as shown.|
Step 7| Front Side Plates| Align the tab at the bottom of the bracket with the slot located at the front of the spacer block.|
Step 8| Front Side Plates| Slide the tab into the slot. A click should be felt/heard when it is fully seated.|
Step 9| Front Sides Plates| The Side Plates are not installed. Repeat steps 1-9 for the other side.|
Step 10| Top Plate| Ensure that both side brackets are fully inserted. The flat surface on which the top plate will rest should be flat.|
---|---|---|---
Step 11| Top Plate| Bend the front side plates outwards as shown.|
Step 12| Top Plate| Align the slots in the top plate with the side plate tabs.|
Step 13| Top Plate| Ensuring that the front side plates are still pushed out, lower the top plate onto the side plates.|
Step 14| Top Plate| The side plate tabs should pass through the slots in the top plate.|

Step 15

|

Top Plate

| Push the top plate towards the back of the drone such that it locks with the hooks on the side plates.|
---|---|---|---
Step 16| Top Plate| Push the front side plate inwards so that it rests against the top plate. Both side plates should be aligned.|
Step 17| Top Plate| Once the side plate is pushed in towards the top plate, push the quarter turn in and rotate clockwise to lock.|
Step 18| Top Plate| The quarter turn tab should be horizontal once it is locked.|
Step 19| Top Plate| Pull outwards on the front side plate to ensure that the quarter turn is secured.|
Step 20| Top Plate| The bracket is now installed and ready for flight.|

4. PSDK Flight Termination System Firmware Configuration
Ongoing Use

Connecting PRS-M350 FTS PSDK Module.

Step 1| Open the DJI M350 RTK PSDK Port| Open PSDK port.|
Step 2| Orient the PRS- M350 FTS PSDK Module| Align the PRS-M350 FTS PSDK Module so the HR30 Connector is pointing up.|
Step 3| Align the PRS- M350 FTS PSDK Module| Align the PRS-M350 FTS PSDK Modules USB-C to the DJI M350 RTK PSDK port and is facing the correct orientation with the HR 30 connector closer to the front of the DJI M350 RTK.|
Step 4| Connect the PRS-M350 FTS PSDK Module| Gently, but firmly, connect the PRS- M350 FTS PSDK with the DJI M350 RTK PSDK port.|
Step 5| Plug in the PRS- M350 FTS PSDK Module to the DJI M350 RTK| Ensure the PRS-M350 FTS PSDK module is securely plugged in.|
Step 6| Connect HR30 FTS Cable to Electronic Module and FTS PSDK Module| Use the HR30 FTS cable to connect the FTS interface on the left side of the PRS-M350 (the side with no cap) and the FTS PSDK Module.|

**** VERIFY THAT THE PSDK APP HAS BEEN ACTIVATED.
VERIFY THAT ALL HARDWARE CONNECTIONS ARE SECURED.

First Time Use & After Firmware Updates
The PRS-M350 uses the DJI M350 RTK Onboard SDK (PSDK) to instigate flight termination. The flight termination system shuts off the DJI M350 RTK motors prior to the deployment of the Parachute Pod™. This installation section provides the steps to correctly configure and activate the DJI M350 RTK PSDK App using DJI Assistant 2 (Enterprise). These steps must be completed prior to first time use, and after updating the firmware on the DJI M350 RTK.

Configure the PSDK in DJI Assistant 2

Step 1| Before Starting| To complete this configuration using DJI Assistant 2 (Enterprise), an internet connection is required.
Download and install DJI Assistant 2 (Enterprise) if it is not already installed.
The PRS will need to be installed on the DJI M350 RTK. Please keep the hardware connection described on page 26. You will also need the manual remote to verify the status.
Step 2| Plug in USB- C Cable| Plug in the USB-C cable to the Assistant Port located on the right side of the drone. Connect the other end of the cable to your computer.
Step 3| Launch DJI Assistant 2| Launch DJI Assistant 2 (Enterprise). Make sure you have the latest version of DJI Assistant 2,which you can download from https://enterprise.dji.com/matrice-350-rtk/downloads
Step 4| Log in to DJI Assistant 2| Log in to your DJI Account. If you do not have an account, you will need to create one.
Step 5| Configure Settings| Open the settings tab in the top right of the window. Configure the data authorization settings to allow for data authorization of the Onboard SDK APP ID. Turn on the authorizations as shown.
Step 6| Turn on DJI M350 RTK and PRS| Turn on your DJI M350 RTK. Verify that the PRS is on. It should power on automatically when the DJI M350 RTK is turned on. If it does not turn on automatically, ensure that the FTS Module and FTS Cable are connected properly. The LED on the PRS will blink purple and blue when the FTS is plugged in but not yet configured.
Step 7| Turn on Remote| Turn on the manual trigger remote. This will allow you to verify the status of the FTS.
Step 8| Connect to Drone| Once the drone is on, the DJI Assistant 2 app will recognize that the Matrice 300 RTK is available. Click on the icon to connect to the drone.
Step 9| Configure DJI M350 RTK PSDK| Select the “Onboard SDK” tab from the left side menu. In this new window, complete the following:
• Select “Enable API Control” via checkbox on the top left.

Note: If this is not the first time completing these steps on this drone and you are simply re-configuring the FTS as a result of a firmware update to the DJI M350 RTK, the LED on the PRS may turn green at this stage. In this case, the setup is complete. If this is the first time configuring the FTS on this drone, OR the LED does not turn green, proceed to the next step.

Step 10| Turn Off PRS and Drone| Turn off the PRS. Once complete, turn off the DJI M350 RTK.
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Step 11| Close DJI Assistant 2| Once the PRS and DJI M350 RTK are off, close DJI Assistant.
Step 12| Launch DJI Assistant 2| Re-launch DJI Assistant 2.
Step 13| Turn on Drone and PRS| Turn on the DJI M350 RTK. Verify that the PRS is on. The PRS should turn on automatically.
Step 14| Reconnect to Drone in DJI Assistant 2| Once again, the DJI Assistant 2 app will recognize that the DJI M350 RTK is available. Click on the icon to connect to the drone.
Step 15| Verify Settings| Return to the Onboard SDK tab using the left side menu. Verify that the correct settings were saved.
• The “Enable API Control” checkbox on the top left should be checked.
Step 16| Cycle PRS Power| Turn the PRS OFF. Wait a moment and then turn the PRS back ON. After a moment, the LED will blink purple and blue.
Step 17| Cycle PRS Power Again| Turn the PRS OFF. Wait a moment and then turn the PRS back ON. Now the LED on the PRS should turn green once it has finished initializing. Once the LED is green, the FTS has been properly configured and is ready to use.

**** The LED will turn yellow if the manual trigger remote is not connected. __

Step 18| Process Complete| Once the LED on the PRS is green, the setup process is complete. Turn off the PRS, drone and manual remote in that order. The USB-C can now be unplugged from DJI assistant. Don’t forget to reinstall the small silicon cover to protect the Assistant Port during flight.
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MAKE SURE ALL CONNECTORS ARE PROPERLY ATTACHED TO THE FLIGHT TERMINATION SYSTEM AND PRS-M350.
DO NOT LEAVE METAL TERMINALS EXPOSED TO OPEN AIR WHEN NOT IN USE.

Battery & Charging

1. Battery Safety

The PRS-M350 EM is equipped with an independent 1S LiPO battery to supply power.
The PRS-M350 EM and manual triggering device (manual remote) shall be charged before use and only by an AVSS supplied or approved USB-C Cable.
The batteries nominal voltage is 3.7
Failure to comply may result in damage to the battery, the PRS-M350, severe overheating, and/or fire.
If left in unsuitable environments, the system and/or components may be damaged, the warranty will shall be void, and the items may not properly function.
During charging, keep watch on the charging process and react to any potential problems that may occur.
Never leave unprotected charging batteries unattended.
The EM battery should be replaced within two (2) years of purchase.

DO NOT TAKE OFF WHEN THE BATTERY INDICATOR IS RED.
RISK OF EXPLOSION IF THE BATTERY IS REPLACED BY AN INCORRECT TYPE.
2. Battery Charging
Charging

Only charge the device when it is powered off.
Insert the supplied cable to the USB-C port on the device. Only use a power source that follows USB standard for charging.
Maximum ambient temperature for charging the EM is 40˚C (104˚F).
Maximum ambient temperature for charging the Manual Triggering Device (REMOTE) is 35˚C (95˚F).

Battery Indications

The battery charge status on both devices (manual triggering device and electronics module) can be checked by pressing the synchronization (“Sync”) button after the startup sequence is finished.

The battery colors are the following:

LED Color	(red)	(yellow)	(green)	(white)
Battery %	0-25	25-50	50-75	75-100

** THE PRS-M350 EM HAS A BUILT-IN CHARGING CIRCUIT FOR MAINTAINING ADEQUATE BATTERY CHARGE USING POWER SUPPLIED BY THE DJI M350 RTK PSDK PORT.
3. Changing Electronic Module Battery**

Replacing PRS-M350 Battery

Firmware & SD Card

1. MicroSD Card

Removing and/or Inserting the SD Card

Step 1| Open Door| Pull the tab on the charging port cover to open it. The tab will open with a hinged door that opens to the right, towards the power button.|
Step 2| Remove SD card| Gently press the SD card in to release the latch and then pull the card out of the slot. Use Tweezers if necessary.|

Step 3| Insert Micro SD-Card| To insert the micro SD-card, slide it into the slot with the metal contacts facing up. An audible click should be heard when it connects properly.|

2. Firmware Updates
Firmware updates should be performed when a new version is released by AVSS. Check the AVSS website regularly for firmware updates.

Updating the Firmware

Step 1| Synchronize Remote and PRS- M350| Follow the steps in Manual Triggering Device Synchronization to synchronize the remote and PRS-M350 before updating the firmware|
Step 2| Download firmware| Download the firmware from the bottom of the page on https://www.avss.co/products/prs-for-dji-M350-rtk/|
Step 3| Copy the firmware on a SD card| Extract the zip file and copy the firmware (sfb files) on an SD card and insert in the PRS-M350, there may be 3 firmware files if this is a major release (PRSM300, RMT, DBM300). Do not change the file names of the Firmware.|
Step 4| Connect FTS of PRS-M350 to the DJI M350| Ensure that the drone, PRS- M350, and Manual Remote are all turned off. Connect the FTS cable on the PRS-M350 to the DJI M350 RTK.|
Step 5| Turn on DJI M350 RTK drone| Turn on the drone, which should automatically turn on the PRS- M350, if not, turn on the PRS- M350 by clicking the main PRS- M350 button, next to the status LED.|
Step 6| Firmware LED| The PRS-M350 LED should turn white to indicate the firmware is downloading. Then the LED should be pink to indicate updating, and then the LED will turn white again to download the next firmware. Wait till the PRS-M350 LED turns yellow , indicating a successful firmware update for the PRS-M350 and daughterboard.|
Step 7| Turn on the manual remote| Keep the remote at least 3 meters away from the DJI M350 RTK, then turn on the remote. The remote firmware will now update and the LED should be white. When the firmware is successfully updated the remote will either restart or turn off. Turn on the remote and the PRS-M350 and remote LED should be green. Check the event log for the correct firmware version listed on the website.|
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Status Indications

The PRS-M350 status, also referenced as “Heartbeat” is indicated using a combination of LED color and buzzer signals. The PRS-M350 Status LED is located next to the ON/OFF switch. The LED color on PRSM350 and manual triggering device indicates the stage of the flight.The manual triggering device LED indicates its state for 2 seconds and blinks the color of the PRS-M350 when a connection is established. The buzzers indicate secondary information which can be either continuous and require action or show
a single event for user information.
1. PRS-M350 Indications

2. Manual Triggering Device Status Indication
The LED on the manual triggering device indicates its status for 2 seconds and blinks the status of the PRS-M350 so the pilot can monitor the status of the PRS-M350 in the sky conveniently. 5 Purple, Blue, Yellow, Red, Cyan, Green, Off
6 Buzzer is illustrated by lines around the color marks
7 Disconnection of the FTS after the initialization produces the same error and needs a power cycle to run diagnostic again
8 Dependent on environmental factors and number of battery charge cycles

PRS-M350 USER MANUAL FOR DJI M350 RTK
The manual triggering device status has the following colors:

3. Manual Triggering Device Synchronization

Make sure that both devices are off.
Hold the Sync button on the manual triggering device and, while turning it on, until the LED turns white.
To increase the channel, press and hold the arm button until the LED turns off then release. Repeat to increase the channel further. Number of channels depends on the local regulations.
Hold the Sync button on the PRS-M350 and while turning it on. The LED should be white.
Hold the Sync button on the manual triggering device and turn it on.
Both devices will generate a tone and Sync.
Note, the manual triggering device can also change channels. This feature can be used to potentially reduce RF interference. To change the manual triggering device channel, the user should contact customersupport@avss.co.

**** ONCE A DEVICE IS PUT TO SYNC MODE, IT WILL SYNCHRONIZE WITH THE FIRST DEVICE IT FINDS. TO PREVENT UNINTENDED SYNCHRONIZATION, SYNCHRONIZE ONLY A SINGLE PRS-M350 AND A SINGLE MANUAL TRIGGERING DEVICE AT THE SAME TIME.

Operating Procedures

1. Hangar Checklist

Make sure manual triggering device battery is fully charged
Make sure the electronic module battery is charged more than 25%
Make sure that the memory card is inserted and has enough storage space

2. Installation Checklist

Ensure that the PRS-M350 and bracket are not damaged
Ensure the foam spacers are still secure to the bracket
Insert Attachment Bracket legs, two per side, to the bracket leg connectors
Ensure that the PRS-M350 top plate and main system are securely attach
Verify that bracket is secure to the DJI M350 RTK
Check that the FTS connectors on the electronics module, FTS module and cable are clean and undamaged
Plugin HR30 FTS cable to FTS module
Plug the HR30 FTS cable into the electronics module
Ensure that the HR30 FTS cable is securely connected and cannot interfere with propellers
Check that manual triggering device antenna is oriented vertically

3. Pre-Flight Checklist

Perform DJI M350 RTK Preflight checks
Verify and note any high-power RF emitters in the operational volume
Ensure DJI M350 RTK is in position mode
Connect the HR30 FTS cable with PRS-M350 electronic module
Turn on PRS-M350 Manual Triggering Device
Turn on PRS-M350 by turning on the DJI M350 RTK
Check continuity light
Check the buzzers and lights (heartbeat)
Check battery level and ensure it is at least 50%
Wait for successful initialization
Ensure no errors are present
Move at least 5 meters away from the DJI M350 RTK
Arm the manual triggering device by holding down the “Arm” button for about 2 seconds and will provide audio feedback with the statement of “Remote Armed”
Takeoff and climb to minimum deployable altitude

** AUTO-TRIGGER WILL ONLY ARM ONCE AN ALTITUDE OF 43 METERS IS REACHED.
4. In-Flight Checklist**

Always fly in Position Mode
Fly in a safe and controlled manner
Avoid flying over people if unnecessary

5. Landing Checklist

Land DJI M350 RTK gently on a level surface a safe distance from people
The ATS should disarm when the DJI M350 RTK is 5 meters from the ground. The manual remote will indicate when the ATS disarms. Do not approach the DJI M350 RTK until the ATS is disarmed. If the automatic ground detection does not disarm the ATS then it will take approximately 5 seconds after landing to disarm the ATS. Note, the pilot will be notified through a voice command on the manual triggering device
Disarm manual triggering device
Turn off the PRS-M350 once it has landed
After the PRS-M350 is off, turn off the DJI M350 RTK

6. Post-Flight Checklist (No Deployment)

Ensure PRS-M350 is disarmed before approaching the DJI M350 RTK
DO NOT STAND DIRECTLY OVER THE PRS-M350 WHEN APPROACHING THE DJI M350 RTK
Turn off PRS-M350 BEFORE handling the DJI M350 RTK
Turn off the DJI M350 RTK
Disconnect HR30 FTS cable before removing batteries
Inspect PRS-M350 for damage

7. Deployment Checklist
 If necessary, the system can be deployed using the manual triggering device
 If possible, fly over a safe area free of people, cars or obstacles
 Press and hold the trigger button on the manual triggering device
 Visually follow the DJI M350 RTK’s descent to the ground

8. Post-Flight Checklist (With Deployment)

Hold parachute by the lines and fold canopy to prevent wind from inadvertently inflating the parachute
Turn off PRS-M350
Turn off DJI M350 RTK
Disconnect PRS-M350 and bracket from the DJI M350 RTK
Verify that no components are missing

Maintenance & Care

Maintenance and inspection intervals of the AVSS PRS-M350 are required to maximize the safety of each flight and ensure proper functionality for parachute deployment whenever it may be required.
The PRS-M350’s Electronic Module is expected to reliably function for several parachute deployments so long as no damage is imparted to the module. The PRS-M350’s Parachute Pod™ is intended as a single-use item that can be quickly removed and replaced in the field; however, the PRS-M350 must be repacked in one (1) year intervals.
1. Post-Flight (Monthly)

Visually inspect the PRS-M350 to ensure there is no damage
Test the receptacles on the Electronic Module and Parachute Pod™
Test the manual triggering device

2. Transportation

Always transport in a secure storage case

3. Storage

Always ensure the power is off
Make sure the unit is clean and dry before putting in the case

4. Extended Storage Considerations

Store in a dry room, that is room temperature
Uninstall the AVSS PRS-M350 assembly down to the following separate components:
a. PRS-M350 Electronic Module
b. PRS-M350 Parachute Pod
Visually inspect the electrical connectors located on both the Electrical Module and the Parachute Pod. Check against signs of corrosion, dust/dirt buildup, wear, or any other types of abnormalities. Clean electrical contacts with rubbing alcohol and cotton swabs if necessary.
Inspect the Main Parachute and harness lines for:
a. Signs of moisture such as standing water or mold
b. Tears, rips, fraying and other signs of wear and damage
If any of the above defects are present during the annual inspection, contact AVSS for further information.

Frequently Asked Questions

1| How do I register my PRS-M350?| Go to https://www.avss.co/products /product-registration/
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2| When does the ATS Arm?| 43 meters
3| When does the Manual Triggering Device Arm?| By the pilot initializing the manual triggering devicethrough the “arm” button
4| When does the PRS-M350 return to a standby state?| The ATS disarms when the DJI M350 RTK is within 5 meters of the ground. If this sensor is not available then the ATS will disarm after landing for 5 to 10 seconds and then the user will receive audio feedback that it has returned to the standby state
5| How many files can the microSD card hold?| Erase microSD card files after 200 flights

6

| How do I check the power level on the electronic module?| Push the blue Sync button, located behind the microSD dust cap on the electronic module, on the PRS-M350 to check the power level

Parachute Pod™ Deployment Procedures

The Parachute Pod™ must be repacked annually. To return a used and/or unused Parachute Pod™, an end-user may do so by sending the Parachute Pod™ directly to AVSS or by returning the Parachute Pod™ to their Authorized Dealer.
Sending to AVSS:

Before sending the Parachute Pod™ to AVSS, contact customersupport@avss.co to request a shipping label.
If you are purchasing a new Parachute Pod™, AVSS will send you a purchase link for a replacement Parachute Pod™, plus deposit.
Once fully paid, AVSS will then send you the replacement Parachute Pod™.
To return your Parachute Pod™ and receive your deposit, utilize the same box with the provided shipping label to send the Parachute Pod™ to AVSS.
Once AVSS receives the Parachute Pod™ and completes the visual inspection, you will be notified and will receive your deposit within fourteen business days.

Sending to an Authorized Dealer:

Contact your Authorized Dealer to notify them that you will be returning and/or requesting a new Parachute Pod™
If you are purchasing a new Parachute Pod™, the Authorized Dealer will either send you a purchase link for a replacement Parachute Pod™, plus deposit, or accept payment at their physical location.
Once fully paid and your Parachute Pod™ has been returned, the Authorized Dealer will then send you or directly provide you with the replacement Parachute Pod™.

Customer Support

Email: customersupport@avss.co
Telephone: Monday to Friday, excluding holidays
10:00 am Est to 4:00 pm Est
+1-844-852-0665

Appendix A: DJI M350 RTK & Payload References

Drone / Payload

| Date|

Link

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DJI M350 RTK| 2023-10-04| https://enterprise.dji.com/matrice-350-rtk/downloads
DJI H20| 2020-09-01| https://www.dji.com/ca/zenmuse-h20-series/specs
DJI H20T| 2020-09-01| https://www.dji.com/ca/zenmuse-h20-series/specs
U10 Methane| 2019-10-09| https://terra-1- g.djicdn.com/851d20f7b9f64838a34cd02351370894/others/EN- a5_U10%20Gas%20Detector_en_format_191009.pdf
Wingsland Z15| 2019-09-16| https://terra-1- g.djicdn.com/851d20f7b9f64838a34cd02351370894/others/Z15_Spot light_en.pdf
Zenmuse XT| 2016-07-11| https://dl.djicdn.com/downloads/zenmuse_xt/en/Zenmuse_XTUser Manual_V1.2_en_0708.pdf
Zenmuse XT 2| 2018-05-11| https://dl.djicdn.com/downloads/Zenmuse%20XT%202/Zenmuse%20 XT%202%20User%20Manual%20v1.0_.pdf
Zenmuse Z30| 2018-10-08| https://dl.djicdn.com/downloads/zenmuse_z30/20180810/Z30User Manual_EN.pdf

Appendix B: IMU Calibration Instructions

A red flashing LED and a beeping sound coming from the PRS-M350 indicates that the IMU must be calibrated. There are two methods of calibrating the IMU on the PRS-M350, either by placing the PRSM350 in the travel box or keeping the PRS-M350 on the drone. The preferred method is in the box; however, if the box cannot be located, performing the calibration on the drone is acceptable.

PRS-M350 IMU Calibration in the box

Step 1| Remove the PRS-M350 from the brackets on the drone, but do not remove the module from the base plate.|
Step 2| Turn the PRS-M350 on and lay it on the PRS box, keeping it stationary for a couple of seconds until the LED flashes red and the PRS-M350 starts beeping.|
Step 3| Place the PRS-M350 in its position in the PRS-M350 box.|
Step 4| Close the box.|
Step 5| Rotate the box 90 degrees towards the latched end and allow the box to stand on this end for 5 seconds.|
Step 6| Rotate the box 90 degrees in the opposite direction and allow it to stand on this end for 5 seconds.|
Step 7| Bring the box back to the original position and rotate it to the right side 90 degrees and wait for 5 seconds.|
Step 8| Bring the box back to the original position and rotate it to the left side 90 degrees and wait for 5 seconds.|
Step 9| Bring the box back to the original position and leave it stationary for 20 seconds.|
Step 10| If the calibration is successful three beeps will start from the PRS-M350 and the PRS will auto shutdown in 5 seconds.| If the calibration is unsuccessful the LED will continue to flash and the beeping will sound, go back to step 2 and re-calibrate.

If the calibration is successful, the PRS LED will flash pink and blue, and the module is ready to fly.
If the travel box cannot be found and calibration is needed, then use the following method on the drone.

PRS-M350 IMU Calibration on the Drone

Step 1| Remove the props from the drone and keep it on a level surface.|
Step 2| Turn on the PRS-M350. The PRS-M350 should be beeping and flashing red|
Step 3| Tilt the drone backward 90 degrees. Hold steady for 5 seconds.|
Step 4| Bring the drone back to level and then tilt it forward 90 degrees. Hold steady for 5 seconds.|
Step 5| Bring the drone back to level and then tilt it towards the right 90 degrees. Hold steady for 5 seconds.|
Step 6| Bring the drone back to level and then tilt it towards the opposite side 90 degrees. Hold steady for 5 seconds.|
Step 7| Bring the drone back to level and leave it for 20 seconds.|
Step 10| If the calibration is successful three beeps will start from the PRS-M350 and the PRS-M350 will auto shutdown in 5 seconds.| If the calibration is unsuccessful the LED will continue to flash and the beeping will sound, go back to step 2 and re-calibrate.

Appendix C: Additional Information

1. Pre-Flight FTS Check
The PRS-M350 allows for a pre-flight FTS check on the ground for the DJI M350 RTK. This pre-flight check is only enabled on the ground with the motors initially disarmed. This PRS-M350 mode is only enabled for 1 minute, after which the PRS-M350 will auto shutdown and must be restarted.

FTS Pre-flight testing on PRS-M350

Step 1| Turn On the DJI remote and M350 RTK| Connect the FTS module to the drone and the PRS-M350 and turn on the drone remote controller and then the drone.|
Step 2| Turn on Remote| Turn on the manual remote by holding the power button. The LED on the top of the remote should turn GREEN.|
Step 3| FTS mode| Hold down the sync button and press the arm button at least 3 times quickly. Keep the sync button held. The LED on the remote and PRS should now be blue. The remote should say “FTS” repeatedly. The PRS-M350 and remote are now in “FTS mode”.|
Step 4| Turn Drone motors on| Stay clear of the propellers of the drone and, when safe to do so, start the drone’s motors.|
Step 5| FTS Test| To trigger the FTS press the ARM button on the Manual Remote once.|
Step 6| Automatic shutdown| After the motors have stopped, the PRS-M350 will automatically shut down, and the Manual Remote will reset. The parachute cannot deploy on the ground and the Red button on the Manual Remote will not be functional in FTS mode.|
Step 7| Back to Normal Operation| After the FTS test, power off the drone and turn it back on. Ensure that both the manual remote and PRS-M350 have a GREEN LED.|
Step 8| Arm the Manual Remote| Arm the Manual Remote and the PRS-M350 is now ready to fly.|

** The PRS-M350 will automatically shut down after 1 minute if the FTS is not triggered in FTS-mode. If the PRS-M350 is manually restarted before the FTS is triggered or before the timeout then the remote may still be in FTS mode. The remote will also reset after 1 minute of being in FTS mode. This is to prevent any flights in this mode.
2. Ground Risk Buffer Prescription
** The table below provides a method to calculate the ground risk buffer zone for your operation according to the Specific Operation Risk Assessment. The rows that are not highlighted are values that are specific to the operation. The DJI M350 RTK max speed in N-Mode is 15 m/s, the wind speed is based on the time and place of the operation. The max altitude is based on the operation. The descent rate should be based off the maximum takeoff weight which is 3.54 m/s.

Ground Risk Buffer

T| human latency + system latency| 3| s
V1| Drone Max Speed| 15| m/s
W| Wind Speed| 3| m/s
A| Max altitude| 120| m
DR| Descent Rate| 3.54| m/s
D1| TV1| 45| m
D2| 1.1W*A/DR| 111.9| m
GRB| Ground Risk Buffer = D1 + D2| 156.9| m

3. Firmware Update Process for Conversion From PRS-M300 to PRS-M350
To update the PRS-M350 or to make the PRS-M300 compatible with the DJI M350 RTK follow these steps:

Update the DJI M350 RTK to the latest version on DJI Assistant 2
Enable the API Control in DJI Assistant 2 under “Onboard SDK” as shown in Section 4. Of the PRS-M350 User Manual
Download the latest PRS-M350 firmware file from the AVSS website, as well as the latest PSDK firmware file (DBM300) and add extract these “sfb” files. Copy them to the SD card of the PRSM350 and place the SD card back in the PRS-M350.
Connect the PRS-M350 to the DJI M350 RTK. The connector should be on the side of the PRSM350 that does NOT have a dust cap.
Turn on the DJI M350 RTK and the PRS-M350 should automatically turn on. If it does not, then ensure that the black PSDK module is connected to the DJI M350 RTK. You may have to press down with some pressure on the PSDK module to ensure it is connected.
Once the PRS-M350 is turned on the main LED will turn white indicating that the firmware is updating. If it does not turn white, then you may have the wrong firmware frequency (915 vs 868) or the PRS-M350 may not be installed in a steady and level manner.
After updating the LED will flash pink and blue for around 2 minutes. After 2 minutes the drone and PRS-M350 should establish a connection and the LED will be either yellow (if the manual remote is turned off) or green.