EBYTE LRM-03S-D LoRa DTU Wireless Module Instruction Manual

EBYTE LRM-03S-D LoRa DTU Wireless Module

Specifications

• Model: LRM-03S-D
• Manufacturer: Dalian Jiupeng Electronic System Engineering Co.,Ltd
• Frequency Range: 903MHz – 927MHz
• Voltage Input: 8 ~ 28V (DC)
• Modulation Technology: LoRa
• Interface: RS485
• Antenna: SMA-K
• Air Rate Rating: Adjustable between 0.3 and 19.2 bps
• Cache Size: Enter a packet of 58 bytes at a time, more than subcontract

Product Usage Instructions

Product Overview
The LoRa-DTU Wireless Module is a wireless data transmission radio that uses LoRa modulation technology. It operates in the frequency band of 903MHz to 927MHz. The module provides a transparent RS485 interface and supports a voltage input of 8 ~ 28V (DC). With LoRa spread spectrum technology, this module offers longer communication distance and strong anti-interference ability.

Application Architecture Diagram
The module can be used in various applications and is compatible with webAccess. It supports multiple units with unique IDs for communication.

Product Unit Description

Technical Parameter Index

Frequency Range and Number of Channels

• Default Frequency: 922M Hz
• Band Range: 903 – 927 MHz
• Channel Spacing: 1000 Hz
• Number of Channels: 25, half duplex

Air Rate Rating

• Default Air Rate: 9.6 kbps
• Number of Levels: 6
• Air Rate Rating: Adjustable, adjust between 0.3 and 19.2 bps

Sending and Receiving Length and Subcontracting Method
Cache Size: Enter a packet of 58 bytes at a time, more than subcontract

Configuration Instructions
The LoRa-DTU(485) module can be configured using a PC display interface. The user can switch to the configuration mode through the mode key and quickly configure and read parameters on the PC.

Frequently Asked Questions (FAQ)

• Q1: What is the frequency range of the LoRa-DTU Wireless Module?
  A1: The frequency range of the module is 903MHz to 927MHz.

• Q2: Can the voltage input be higher than 28V (DC)?
  A2: No, the module only supports a voltage input of 8 ~ 28V (DC).

• Q3: How many channels does the module support?
  A3: The module supports 25 channels in half duplex mode.

Product Overview

This module is a wireless data transmission radio using LoRa modulation technology, working in (903MHz — 927MHz) frequency band, the module provides transparent RS485 interface, adopts plastic shell, guide mounting structure, support 8 ~ 28V (DC) voltage input. LoRa spread spectrum technology will bring longer communication distance, and has the advantage of strong anti- interference ability.

Application architecture diagram

Product Unit Description

Technical parameter index

Frequency range and number of channels

Model Specification| Default frequency| Band range| Channel spacing| Number of channels
---|---|---|---|---
Hz| Hz| Hz
LoRa-DTU(485)| 922M| 903– 927MHz| 1000k| 25, half duplex

Note: When multiple groups of data stations are used in the same area for one one-to -one communication at the same time, it is recommended that each group of data stations set a channel interval of more than 2MHz.

Air rate rating

Model Specifications| Default air rate| Number of levels| Air rate rating
---|---|---|---
bps| bps
LoRa-DTU(485)| 9.6 k| 6| Adjustable, adjust between 0.3 and 19.2

• Note: The higher the air rate setting, the faster the transmission rate and the closer the transmission distance; Therefore, in the case that the rate meets the requirements of use, it is recommended that the lower the air rate is the better.
• Note: It is recommended that the air speed setting in engineering applications is better than or equal to the serial port baud rate.
• Note: It is recommended that the installation position of engineering application equipment is more than 2 meters above the ground.

Sending and receiving length and subcontracting method

Configuration Instructions

LoRaDTU(485) configuration PC display interface (Figure 5.1), the user can switch to the configuration Mode through the mode key, the parameters in the PC quickly configuration and read.

• Air Rate: The higher the air rate setting, the faster the transmission rate and the closer the transmission distance; Therefore, in the case that the speed meets the requirements of use, it is recommended that the lower the air speed is better.
• RadioPower: The higher the transmit power, the greater the signal strength.

Advanced properties control the Do output according to the set logical conditions.

Working mode
LoRaDTU(485) has two working modes, the need for normal communication requires the radio to be configured as transparent mode (mode 0) by pressing the button, the radio is default set to transparent mode (mode 0) when the factory.

(factory default mode)
Mode 1| Command Mode| ON| ON| Radio stations can be configured using configuration software

Hardware DescriptionPorts

1. Type: LRM-03S-D
2. Power Supply: DC8-28V
3. Frequency Range: 903MHz — 927MHz
4. Ports:
5. One channel RS485
6. Two circuit DI: Two high and low level contact inputs, or high-speed pulse (1-2KHz) input counting: circuit isolation; Optoelectronic isolation; Input impedance ≥ 6k Ω; It is recommended to use twisted pair shielded wire to capture the rising edge count.
7. Two circuit DO: Two circuit transistor output; Contact capacity 24VDC 400mA;
8. Two channel 12 bit resolution sampling; Resolution: 5 μ A; Sampling period: ≤ 100ms; DC current 0-20mA or voltage signal 0-5V;
9. Peripheral 485 protocol address:

  * modbus station number Address 1 Set the modbus address to 40002.
  * The two DI addresses 0 to 1 modbus addresses are 10001, 10002.
  * The modbus addresses of the two DO address 0 to 1 are 00001, 00002.
  * The modbus addresses of the two AI address 0 to 1 are 30001,30002, and the unit of current type is uA. The unit of voltage type is mV.
  * When the input signal is 2V, the actual data collected is 2000mV.
  * When the input signal is 4mA, the actual data collected is 4000uA.
  * AI1 Input type address 7 modbus address is 40008, 0 is 0-20mA, and 1 is 0- 5V.
  * AI2 Input type address 8 modbus address is 40009, 0 is 0-20mA, and 1 is 0- 5V.
  * DI1 and DI2 access pulse signals
  * DI1 pulse Clear modbus address 00003,
  * DI2 Pulse Clear modbus address 00004,
  * The number of DI1 pulses is collected using modbus address 40037 and 40038. The data type is unsigned and integer 32-bit.
  * Statistics of pulse times of DI2 Statistics of pulse times using modbus address 40039 and 40040, data type unsigned shaping 32 bits,
  *  **Note:** When using high-frequency pulse signal input, it is recommended to use a twisted-shielded servo code line.

FCC

Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
NOTE: This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
FCC Statement: This equipment has been tested and found to comply with the limits for a Class B digital device, under part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used by the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

This equipment should be installed and operated with minimum distance 20cm between the radiator and your body
Note: It is recommended that the installation position of engineering application equipment is more than 2 meters above the ground.

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