QUECTEL LC79H Series GNSS Module User Guide
- June 16, 2024
- QUECTEL
Table of Contents
- LC79H Series GNSS Module
- Introduction
- General Overview
- EVB Interfaces
- Testing and Firmware Upgrading via QGNSS Tool
- EVB and Antenna Installation
- Measuring Power Consumption
- EVB Framework
- Common Problems and Troubleshooting
- Cautions
- Appendix References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
LC79H (AL)
EVB User Guide
GNSS Module Series
Version: 1.1
Date: 2023-05-10
Status: Released
LC79H Series GNSS Module
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Copyright © Quectel Wireless Solutions Co., Ltd. 2023. All rights reserved.
Safety Information
The following safety precautions must be observed during all phases of operation, such as usage, service or repair of any terminal incorporating Quectel LC79H (AL) module. Manufacturers of the terminal should distribute the following safety precautions to users and operating personnel, and incorporate them into all manuals supplied with the product. Otherwise, Quectel assumes no liability for customers’ failure to comply with these precautions.
| Ensure that the product may be used in the country and the required
environment, as well as that it conforms to the local safety and environmental
regulations.
---|---
| Keep away from explosive and flammable materials. The use of electronic
products in extreme power supply conditions and locations with potentially
explosive atmospheres may cause fire and explosion accidents.
| The product must be powered by a stable voltage source, while the wiring
must conform to security precautions and fire prevention regulations.
| Proper ESD handling procedures must be followed throughout the mounting,
handling and operation of any devices and equipment incorporating the module
to avoid ESD damages.
About the Document
Document Information
Title| LC79H (AL) EVB User Guide
Subtitle| GNSS Module Series
Document Type| EVB User Guide
Document Status| Released
Revision History
Version | Date | Description |
---|---|---|
– | 3/14/2022 | Creation of the document |
1 | 7/20/2022 | First official release |
1.1 | 5/10/2023 | 1. Added the model information of GNSS antenna, deleted the |
description of USB flash drive and instruction sheet (Chapter 2.1).
2. Added the description of SAM connector for 1PPS (Figure 3 and Table 2).
3. Added the information of test points (U410) (Figure 3 and Table 4).
4. Deleted the communication via QCOM tool.
5. Updated the firmware upgrade tool as QGNSS (Chapter 4).
6. Added the installation of EVB and antenna (Chapter 5).
7. Added power consumption measurement for the module (Chapter 6).
8. Added the EVB framework (Chapter 7).
9. Added the common problems and troubleshooting (Chapter 8).
10. Added the cautions (Chapter 9).
Introduction
This document provides information on the steps needed to evaluate the Quectel
LC79H (AL) module using the Evaluation Board (EVB). The EVB is a convenient
tool that allows you to become familiar with the LC79H (AL) module.
Specifically, the document is divided into several sections:
- Chapter 2 provides the general overview of EVB kit.
- Chapter 3 describes the EVB user interfaces.
- Chapter 4 describes how to test the module and upgrade the firmware via QGNSS tool.
- Chapter 5 describes the installation of EVB and antenna.
- Chapter 6 describes how to measure power consumption for the module.
- Chapter 7 provides the EVB framework.
- Chapter 8 describes the common problems and troubleshooting.
- Chapter 9 describes the cautions.
- Chapter 10 is an appendix, which summarizes the relevant documents and terms and abbreviations appearing herein.
NOTE
Request QGNSS software tool from Quectel Technical Support
(support@quectel.com).
General Overview
2.1. EVB Kit
The EVB kit includes: Evaluation Board (EVB), active GNSS antenna, Type-B USB
cables, bolts and coupling nuts.
The EVB kit components are shown in the figure below. Check Table 1: List of
Kit Components for details.
Table 1: List of Kit Components
Items | Description | Quantity |
---|---|---|
EVB | Evaluation Board | |
Size: 80 mm × 120 mm | 1 | |
USB Cable | Type-B USB Cable | 2 |
Active GNSS Antenna | Active GNSS Antenna (Model: YB0017AA) |
Antenna Size: 61.5 mm × 56.5 × 23 mm
Cable Length: 3000 mm
The antenna in the kit supports:
• GPS L1 C/A and L5
• GLONASS L1
• Galileo E1 and E5a
• BDS B1I and B2a
• QZSS L1 C/A and L5
• SBAS L1| 1
Others| Bolts and Coupling Nuts| 4 pairs
NOTE
Request Quectel Technical Support
(support@quectel.com) for details about Quectel
Active GNSS Antenna.
2.2. Connect Cable and Antenna to EVB
The connection between the EVB and its components is shown in the figure
below.
NOTE
- It is optional to connect PC and the “POWER” (J204) on the EVB via a Type-B USB cable. For more information, see Chapter 3.2 EVB Interfaces.
- Make sure that the active GNSS antenna is placed with a clear line of sight to the sky.
EVB Interfaces
3.1. EVB Top View
EVB top view is shown in the figure below.
3.2. EVB Interfaces
The EVB interfaces are detailed in the table below.
Table 2: Detailed EVB Interfaces
Function | Interfaces | Description |
---|---|---|
J204 POWER | J204: Only used to supply power to avoid the insufficient supply |
of J509.
Power Supply
Communication Interface
SAM Connector
D514
Indication LEDs| J509
USB| J509: Used to communicate and supply
power.
Power supply input:
•DC power supply: 4.5-5.5 V, typ. 5.0 V
•Current capability should be > 100 mA
.1509
USB
J103 Antenna
connector
U512
1PPS connector POWER
(Green)
VCC (Red)| Supports RTCM and standard NMEA
message, PAIR/PQTM message, binary data and firmware upgrade.
Used for connecting the GNSS antenna.
Used for testing 1PPS signal.
Bright: The EVB is powered well. Extinct: The EVB is not powered. Bright: The
module is powered well. Extinct: The module is not powered.
Signal Indication
D520
Indication LEDs
Switch and Buttons| TXD (Red)
1PPS (Green)
S201
Power switch S503
RESET
S502 WAKEUP| Flashing: Data are being output from UART TXD pin.
Extinct or Bright: No data are output from UART TXD pin.
Flashing: Successful position fix.
Frequency: 1 Hz.
Extinct: No position fix.
Powers the EVB on/off.
Short press on the button to reset the module.
Short press on the button to wake up the module from Backup mode.
The U409 and U410 test points of LC79H (AL) are shown below:
Table 3: U409 Pin Description
Test Point No.| Test Point Label| Test Point Function|
I/O| Description
---|---|---|---|---
1| PIN1| U103: Pin 1| –| Ground
2| PIN2| U103: Pin 2| DO| TXD: Transmits data
3| No label| U103: Pin 3| DI| RXD: Receives data
4| No label| U103: Pin 4| DO| 1PPS: 1 pulse per second
5| No label| –| –| Reserved
6| No label| U103: Pin 6| PI| V_BCKP: Backup power supply
for backup domain of module
7| No label| –| –| Reserved
8| No label| U103: Pin 8| PI| VCC: Main power supply
9| No label| U103: Pin 9| DI| RESET_N: Reset the module
10| No label| –| –| Ground
11| No label| –| –| NC (Not Connected)
12| No label| U103: Pin 12| –| Ground
| | | | ANT_ON: Power control for
13| No label| U103: Pin 13| DI| external LNA or active antenna in
| | | | power saving mode
14| No label| VDD_RF| PO| VDD_RF: Power supply for
external RF components
15| PIN15| U103: Pin 15| –| Reserved
16| PIN16| U103: Pin 16| DIO| I2C_SDA: I2C serial data
Table 4: U410 Pin Description
Test Point No.| Test Point Label| Test Point Function|
I/O| Description
---|---|---|---|---
1| PIN17| U103: Pin 17| DI| I2C_SCL: I2C serial clock
2| PIN18| U103: Pin 18
DI WAKEUP: Wake up the module from the
Backup mode.
3| No label| –
– Reserved
4| No label| –
– Reserved
5| No label| U103: Pin 21| DO| GEOFENCE: Indicates geofence status
6| No label| U103: Pin 22| DO| JAM_IND: Jamming indication
7| No label| U103: Pin 23| DO| 3D_FIX: 3D position fix indication
8| No label| –| –| Reserved
9| No label| –| –| Reserved
10| No label| –| –| Reserved
11| PIN27| U103: Pin 27| –| Reserved
12| PIN28| U103: Pin 28| –| Ground
13| No label| –| –| NC
14| No label| –| –| NC
15| No label| –| –| NC
16| No label| –| –| NC
NOTE
- The serial numbers of U409 and U410 test points are shown in red text in Figure 3: EVB Top View.
- The U409 and U410 test points refer to the module’s corresponding function. For detailed descriptions, see document [1] hardware design.
Testing and Firmware Upgrading via QGNSS Tool
This chapter explains how to use the QGNSS software tool for verifying the status of GNSS module and for firmware upgrade. For more information about QGNSS use, see document [2] QGNSS user guide.
4.1. Testing via QGNSS
Step 1 : Assemble the EVB components.
Step 2 : Connect the EVB and the PC with two Type-B USB cables via
“POWER” and “USB” interfaces or connect the EVB to the PC with a Type-B USB
cable via “USB” interface. Then flip the power switch (S201) to ON position to
power on the EVB.
Step 3 : Start the QGNSS and click “Device” and “Serial Device
Information” (default baud rate: 115200 bps 1 ).
Step 4: Click the Connect or disconnect” button. The interface shown in the figure below appears once the module is connected.
1 UART interface default settings may vary depending on software versions.
NOTE
Ensure the CP210x driver has been installed when you use the QGNSS tool for
the first time. For more information about the driver, please contact the
Quectel Technical Support (support@quectel.com).
4.2. QGNSS Interface Explanation
You can view GNSS information, such as C/N0 message, time, position, speed,
and precision in the QGNSS interface. See the following table to find out more
about these parameters.
Table 5: QGNSS Interface Explanation
Icon | Explanation |
---|---|
This sky view interface shows the position of the satellites in use. |
- The left column icons show the satellites in use and their numbers.
• BDS: 15
• GLO (GLONASS): 6
• GPS: 13
• GAL (Galileo): 5
• QZSS: 0
| • NavIC: 0
• SBAS: 0 - The sky view on the right shows the position of the satellites in use.
| GPS satellite
BDS satellite
GLONASS satellite
Galileo satellite
QZSS satellite
NavIC satellite
| • PRN 30 C/N0 is 39 dB-Hz.
• Column in bright red means that the navigation data of the satellites are in use.
• PRN 1 C/N0 is 21 dB-Hz.
• Column in light red means that the navigation data of the satellites are not in use.
| • Longitude (unit: °)
• Latitude (unit: °)
• Altitude (MSL) (unit: m)
• Receiver speed (unit: km/h)
• Horizontal dilution of precision
• Position dilution of precision
• Fix Mode: 2D, 3D
• Quality Indicator: DGNSS, DGPS, GPS SPS, Float RTK and Fixed RTK modes
• Date: UTC date
• Time: UTC time
• Total Times
• Fixed Points
• RTK Fixed
• RTK Float
• Age of differential GPS data
• TTFF (unit: s)
• 2D accuracy (unit: m)
• 3D accuracy (unit: m)
4.3. Firmware Upgrading
Power on the EVB before upgrading the firmware, see Chapter 4.1 Testing via
QGNSS for details.
Firmware upgrading steps:
Step 1: Open QGNSS tool, and click “Tools” and select “Firmware Download”
in the drop-down box.
Step 2 : Select the “Download Baudrate” (921600 bps or 115200 bps) in the drop-down box of “Setting”.
Step 3: Click the Open Config File” button to select Config file, e.g., “flash_download.cfg”.
Step 4: Click the Run” button and the short press the RESET button after the progress bar prompts you to reset the module.
Step 5 : Upon successful firmware upgrading, the QGNSS tool’s progress bar on the screen will indicate “100 %”.
EVB and Antenna Installation
5.1. GNSS Antenna Installation
The installation environment affects antenna reception performance and
satellite visibility, which in turn affect the position quality of a GNSS
receiver. In addition, antenna’s orientation can also impact its reception
performance. Therefore, it is important to avoid obstacles and interference
when installing antenna. Place the ceramic patch antenna horizontally and make
sure it faces toward the sky.
If dynamic testing is required, make sure that the GNSS antenna is firmly
fixed to the device under test so as to avoid any movement or vibration with
respect to the device.
5.2. EVB Installation
If dynamic testing is required, make sure the EVB is fixed to the device
under test so as to avoid any movement or vibration with respect to the
device.
Measuring Power Consumption
6.1. Power Consumption at Different Stages
Module power consumption is measured in three stages: acquisition and
tracking (including almanac update), tracking (almanac update is over) and
upon entering Backup mode.
- Acquisition and Tracking (including almanac update): 0 s to 12.5 min
- Tracking (almanac update is over): > 12.5 min
- Entering Backup mode
6.2. VCC Power Consumption Measurement
Before measuring the VCC power consumption, you must connect the components
to the EVB to ensure that the module can communicate and fix normally. See
Chapter 4.1 Testing via QGNSS for details.
Detailed steps for measuring VCC power consumption with an ammeter:
Step 1 : Switch off the power supply (S201) and pull out the VCC_MODULE
jumper cap (J102). Connect the ammeter in series to the head pins of J102 as
shown below.
Step 2 : Switch on the power supply (S201) and read the ammeter.
Detailed steps for measuring VCC power consumption with a power consumption
meter:
Step 1: Switch off the power supply (S201) and pull out the VCC_MODULE
jumper cap (J102). Make sure the positive pole of the power consumption meter
is to be connected to pin 2 (without arrow silkscreen) of J102, and the
negative pole is connected to GND.
Step 2: Switch on the power supply (S201) and read the power consumption
meter.
6.3. V_BCKP Power Consumption Measurement
Before measuring the V_BCKP power consumption, you must connect the components
to EVB to ensure that the module can communicate and fix normally. See Chapter
4.1 Testing via QGNSS for details.
Detailed steps for measuring V_BCKP power consumption with an ammeter:
Step 1: Switch off the power supply (S201). Pull out the V_BCKP jumper
cap (J205). Connect the ammeter in series to the head pins of J205, as shown
below.
Step 2: Switch on the power supply (S201) and read the ammeter.
Detailed steps for measuring V_BCKP power consumption with a power consumption
meter:
Step 1 : Switch off the power supply (S201). Pull out the VCC_MODULE
jumper cap (J102) and the
V_BCKP jumper cap (J205). Then, ensure the positive pole of the power
consumption meter is connected to pin 1 (with arrow silkscreen) of J205, and
the negative pole is connected to GND.
Step 2: Switch on the module power supply (S201) and read the power
consumption meter.
NOTE
- Adjust the current resolution when using the power consumption meter.
- The power value can be calculated according to the following formula: P = VSupply × ITest.
- When measuring the V_BCKP power consumption in Backup mode, ensure that the module has entered Backup mode, and then remove the jumper cap of VCC_MODULE (J102) to cut off the power supply of VCC. For more information about the way to enter/exit Backup mode, see document [1] hardware design.
EVB Framework
The power is supplied to EVB via Type-B, and then to GNSS module via a low dropout regulator (LDO). GNSS module outputs the signals from communication interface on EVB via USB to UART Bridge Chip (CP2102N). There are an antenna interface and a control button on EVB. All functions of the module are available, including debugging.
Common Problems and Troubleshooting
-
Unable to find COM port in the Device Manager when EVB is connected to PC with a USB cable.
• Check that the EVB communication interface is properly connected to the PC.
• Verify that CP210x Driver has been installed successfully. -
Communication interface not outputting any messages or commands.
• Check that the power supply indication LED on the EVB is illuminated.
• Verify that the jumper cap(s) is(/are) connected correctly, as shown in Figure 1: EVB and Components.
• Ensure that the module’s power supply is normal. -
Module unable to search for satellite signals.
• If there is no transponder indoors, test the module in an open-sky environment. -
Module unable to upgrade.
• Verify whether the module is in normal operating mode.
• Check that the downloaded firmware is correct.
• Confirm that the correct COM port has been selected.
NOTE
For the problem(s) that cannot be solved, please contact Quectel Technical
Support (support@quectel.com).
Cautions
- Make sure to conduct tests under the same environment when comparing different parameters of GNSS modules.
- Note that parameters, such as cold start, acquisition and tracking, may be defined differently by chip suppliers.
- Ensure that the measurement method is correct. If there are significant differences between parameters tested via EVB and those provided by Quectel, please contact Quectel Technical Support.
- Note that momentary data obtained from measurement cannot always be regarded as reference data, because it may be affected by various factors, such as satellite positions at different times, environmental conditions, temperature, humidity and altitude.
- Keep in mind that the QGNSS Tool may updated periodically to fix bugs or improve performance. Please make sure that you are using the latest version of the tool.
Appendix References
Table 6: Related Documents
Document Name
[1] Quectel_LC79H(AL)_Hardware_Design
[2] Quectel_QGNSS_User_Guide
Table 7: Terms and Abbreviations
Abbreviation | Description |
---|---|
1PPS | One Pulse Per Second |
2D | 2 Dimension |
3D | 3 Dimension |
BDS | BeiDou Navigation Satellite System |
C/N0 | Carrier-to-Noise Ratio |
CEP | Circular Error Probable |
COM Port | Communication Port |
DC | Direct Current |
DI | Digital Input |
DO | Digital Output |
ECEF | Earth-Centered, Earth-Fixed |
ESD | Electrostatic Discharge |
EVB | Evaluation Board |
Galileo | Galileo Satellite Navigation System (EU) |
GLONASS | Global Navigation Satellite System (Russia) |
GND | Ground |
GNSS | Global Navigation Satellite System |
GPS | Global Positioning System |
HDOP | Horizontal Dilution of Precision |
I2C | Inter-Integrated Circuit |
I/O | Input/Output |
LED | Light Emitting Diode |
LLA | Longitude, Latitude, and Altitude |
MSL | Mean Sea Level |
NavIC | Indian Regional Navigation Satellite System |
NMEA | NMEA (National Marine Electronics Association) 0183 Interface Standard |
PC | Personal Computer |
PCB | Printed Circuit Board |
PDOP | Position Dilution of Precision |
PI | Power Input |
PO | Power Output |
PRN | Pseudo Random Noise |
QZSS | Quasi-Zenith Satellite System |
RF | Radio Frequency |
RTK | Real Time Kinematic |
RXD | Receive Data (Pin) |
SBAS | Satellite-Based Augmentation System |
SDA | I2C Serial Data |
SPS | Standard Positioning Service |
TTFF | Time to First Fix |
TXD | Transmit Data (Pin) |
UART | Universal Asynchronous Receiver/Transmitter |
USB | Universal Serial Bus |
UTC | Coordinated Universal Time |
WGS84 | World Geodetic System 1984 |
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