Quectel LG77L EVB User manual

LG77L EVB User Guide
GNSS Module Series
Version: 1.0
Date: 2021-03-23
Status: Released

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Copyright
The information contained here is proprietary technical information of Quectel. Transmitting, reproducing,
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Copyright © Quectel Wireless Solutions Co., Ltd. 2021. All rights reserved.

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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 LG77L module. Manufacturers of the terminal should send
the following safety information to users and operating personnel, and incorporate these guidelines 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 explosiveand 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 that incorporate the module
to avoid ESD damages.

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About the Document
Revision History
Document Information
Title
LG77L EVB User Guide
Subtitle
GNSS Module Series
Document Type
EVB User Guide
Document Status
Released
Version
Date
Description
-
2021-03-23
Creation of the document
1.0
2021-03-23
First official release

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Contents
Safety Information...................................................................................................................................... 3
About the Document.................................................................................................................................. 4
Contents...................................................................................................................................................... 5
Table Index.................................................................................................................................................. 6
Figure Index................................................................................................................................................ 7
1Introduction......................................................................................................................................... 8
2General Overview................................................................................................................................ 9
2.1. EVB KitAccessories .................................................................................................................. 9
2.2. Connecting Cables and Antenna to EVB................................................................................. 10
3Board User Interfaces....................................................................................................................... 11
3.1. EVB Top View............................................................................................................................11
3.2. Board User Interfaces...............................................................................................................11
4Using QCOM Tool to Communicate................................................................................................ 14
4.1. Communication via the Micro-USB Interface........................................................................... 14
5Using PowerGPS Tool to Test......................................................................................................... 15
5.1. COM Port and Baud Rate Setting............................................................................................ 15
5.1.1. Interface Explained ....................................................................................................... 16
5.2. PMTK Command Sending....................................................................................................... 17
5.3. Automatic TTFF Testing........................................................................................................... 18
6Firmware upgrade............................................................................................................................. 23
7Appendix A Reference...................................................................................................................... 27

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Table Index
Table 1: List of Accessories........................................................................................................................10
Table 2: Detailed EVB Interfaces............................................................................................................... 12
Table 3: J401 Pin Detailed Description......................................................................................................13
Table 4: PowerGPS Interface Explained.................................................................................................... 16
Table 5: Related Document........................................................................................................................ 27
Table 6: Terms and Abbreviations..............................................................................................................27

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Figure Index
Figure 1: EVB Kit Accessories .....................................................................................................................9
Figure 2: EVB and Accessories Assembly................................................................................................. 10
Figure 3: EVB Top View ..............................................................................................................................11
Figure 4: USB Ports ...................................................................................................................................14
Figure 5: COM Port Setting Interface of QCOM........................................................................................14
Figure 6: PowerGPS Main Interface (Not Connected) ..............................................................................15
Figure 7: PowerGPS Interface (Connected)..............................................................................................16
Figure 8: PMTK Command Sending via PowerGPS.................................................................................18
Figure 9: Disable These Options................................................................................................................19
Figure 10: Static TTFF Testing via PowerGPS.......................................................................................... 19
Figure 11: Select Reference Location........................................................................................................ 20
Figure 12: Click Use Mean Position...........................................................................................................20
Figure 13: Click Configuration.................................................................................................................... 21
Figure 14: Set TTFF Time-out (Sec)..........................................................................................................21
Figure 15: Click Run/Stop Button............................................................................................................... 22
Figure 16: Firmware Upgrade –Step 1......................................................................................................23
Figure 17: Firmware Upgrade –Step 2......................................................................................................24
Figure 18: Firmware Upgrade –Step 3......................................................................................................24
Figure 19: Firmware Upgrade –Step 4 and 5........................................................................................... 25
Figure 20: Firmware Upgrade –Step 6......................................................................................................25
Figure 21: Successful Firmware Upgrade .................................................................................................26

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1Introduction
This document provides information on how to develop and test the Quectel LG77L module using the
Evaluation Board (EVB). The EVB is a convenient tool that allows you to become familiar with the LG77L
module.
This document describes the interfaces on the EVB; how to test the module with the software tool
(PowerGPS); and how to upgrade the firmware.
The user guide is divided into several sections:
Chapter 2 provides the general overview of EVB Kit accessories;
Chapter 3 describes the EVB user interfaces;
Chapter 4 describes how to communicate with a module by using the QCOM tool;
Chapter 5 describes how to test the module by using the PowerGPS tool;
Chapter 6 describes how to upgrade the module;
Chapter 7 is an appendix, which summarizes the relevant documents, terms and abbreviations
appearing herein.

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2General Overview
2.1. EVB Kit Accessories
The EVB Kit includes: Evaluation Board (EVB),Active GNSS Antenna, Micro-USB Cable, USB Flash Drive,
Bolts and Coupling Nuts. The software tools are placed in the USB flash drive.
The EVB Kit accessories are shown in the figure below, and check Table 1 for details.
USB Cable
USB Flash Drive
Bolts and
Coupling Nuts
GNSS Antenna
EVB
Figure 1: EVB Kit Accessories