Quectel LC79D (A) EVB User manual

LC79D (A) EVB User Guide
GNSS Module Series
Rev. LC79D(A)_EVB_User_Guide_V1.0
Date: 2019-11-14
Status: Released
www.quectel.com

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About the Document
History
Revision
Date
Author
Description
1.0
2019-11-14
Brooke WANG
Initial

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Contents
About the Document.................................................................................................................................. 1
Contents...................................................................................................................................................... 2
Table Index.................................................................................................................................................. 3
Figure Index................................................................................................................................................ 4
1Introduction ......................................................................................................................................... 5
1.1. Safety Information...................................................................................................................... 5
2General Overview................................................................................................................................ 6
2.1. Top View of the EVB .................................................................................................................. 6
2.2. EVB KitAccessories .................................................................................................................. 7
2.3. EVB and Accessories Assembly................................................................................................ 8
3Interface Applications ........................................................................................................................ 9
3.1. Micro USB Interface................................................................................................................... 9
3.2. Antenna Interface....................................................................................................................... 9
3.3. Switches and Buttons .............................................................................................................. 10
3.4. Operation Status Indication LEDs.............................................................................................11
3.5. Test Points................................................................................................................................ 12
4EVB Operation Procedures.............................................................................................................. 14
4.1. Firmware Download................................................................................................................. 14
4.1.1. Firmware Download in Normal Working Mode............................................................. 14
4.1.2. Firmware Download in Host Mode................................................................................ 15
4.2. Communication via Micro USB Interface................................................................................. 15
5Usage of QGNSS............................................................................................................................... 17
5.1. COM and Baud Rate Setting................................................................................................... 17
5.2. PQ Command Sending............................................................................................................ 18
5.3. Automatic TTFF Testing........................................................................................................... 19
6Appendix A References.................................................................................................................... 20

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Table Index
TABLE 1: INTERFACES OF LC79D (A) EVB...................................................................................................... 6
TABLE 2: LIST OF ACCESSORIES.................................................................................................................... 8
TABLE 3: SWITCHES AND BUTTONS............................................................................................................. 10
TABLE 4: OPERATION STATUS INDICATION LEDS........................................................................................11
TABLE 5: PIN DESCRIPTION OF J104............................................................................................................ 12
TABLE 6: PIN DESCRIPTION OF J105............................................................................................................ 13
TABLE 7: RELATED DOCUMENTS.................................................................................................................. 20
TABLE 8: TERMS AND ABBREVIATIONS........................................................................................................ 20

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Figure Index
FIGURE 1: TOP VIEW OF LC79D (A) EVB ........................................................................................................ 6
FIGURE 2: EVB KIT ACCESSORIES ................................................................................................................. 7
FIGURE 3: LC79D (A) EVB AND ACCESSORIES ASSEMBLY ......................................................................... 8
FIGURE 4: MICRO USB CONNECTOR ............................................................................................................. 9
FIGURE 5: ANTENNA CONNECTOR............................................................................................................... 10
FIGURE 6: SWITCHES AND BUTTONS .......................................................................................................... 10
FIGURE 7: OPERATION STATUS INDICATION LEDS .....................................................................................11
FIGURE 8: J104 TEST POINTS........................................................................................................................ 12
FIGURE 9: J105 TEST POINTS........................................................................................................................ 13
FIGURE 10: GNSSFLASHTOOL CONFIGURATIONS FOR FIRMWARE UPGRADE..................................... 14
FIGURE 11: GNSSFLASHTOOL CONFIGURATIONS FOR HOST MODE DOWNLOAD ............................... 15
FIGURE 12: USB PORTS ................................................................................................................................. 15
FIGURE 13: COM PORT SETTING INTERFACE OF QCOM .......................................................................... 16
FIGURE 14: COM PORTAND BAUD RATE SELECTION ............................................................................... 17
FIGURE 15: QGNSS INTERFACE.................................................................................................................... 18
FIGURE 16: PQ COMMAND SENDING VIA QGNSS....................................................................................... 18
FIGURE 17: STATIC TTFF TESTING VIA QGNSS........................................................................................... 19

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1Introduction
This document specifies the usage of LC79D (A) EVB which is an assistant tool for engineers to develop
and test Quectel LC79D (A) module.
1.1. 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 LC79D (A) module. Manufacturers of the terminal should
notify users and operating personnel of the following safety information by incorporating these guidelines
into all manuals supplied with the product. If not so, Quectel assumes no liability for customers’ failure to
comply with these precautions.
Ensure that the use of the product meets the national safety and environmental
regulations, and is allowed in the country and in the environment required.
Keep awayfrom 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 hazards.
The product has to be powered by a stabilized voltage source, and the wiring shall
conform to security and fire prevention regulations.
Proper ESD handling procedures must be applied throughout the mounting,
handling and operation of any application that incorporates the module to avoid
ESD damages.

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2General Overview
2.1. Top View of the EVB
The following figure illustrates the top view of LC79D (A) EVB.
A
B
C
D
EFGH
J
KI
Figure 1: Top View of LC79D (A) EVB
Table 1: Interfaces of LC79D (A) EVB
SN.
Reference No.
Description
A
J102
Antenna connector
B
D101
1PPS Indication LED
C
D103
Transmit Data Indication LED

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2.2. EVB Kit Accessories
GNSS
Antenna EVB
USB Flash Drive
Micro USB
Cable
Bolts and
Coupling Nuts
Figure 2: EVB Kit Accessories
D
J202
Micro USB connector
E
S201
Power Switch
F
S103
WAKE_UP Button
G
S101
NSTANDBY Button
H
S102
BOOT Button
I
J104
Test Points
J
U102
LC79D (A) Module
K
J105
Test Points

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Table 2: List of Accessories
2.3. EVB and Accessories Assembly
The following figure shows the assembly of LC79D (A) EVB and its accessories.
Figure 3: LC79D (A) EVB and Accessories Assembly
Items
Description
Quantity
USB Cable
Micro USB Cable
1
EVB
LC79D (A) evaluation board
1
Antenna
GNSS antenna (Active)
1
USB Flash Drive
USB Flash Drive (including LC79D related
documents, tools, drivers, etc.)
1
Instruction Sheet
A sheet of paper giving instructions for EVB
connection, details of EVB accessories, etc.
1
Other
Bolts and coupling nuts
4 for each

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3Interface Applications
3.1. Micro USB Interface
The EVB is mounted with a micro USB connector to support power supply input and data transmission.
Micro-USB connector
Figure 4: Micro USB Connector
Before using the EVB, please run the USB flash drive on PC to install the USB driver.
3.2. Antenna Interface
The EVB is mounted with an antenna connector for connection of an external passive or active GNSS
antenna.
NOTE

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Antenna connector
Figure 5: Antenna Connector
3.3. Switches and Buttons
The following figure illustrates the switches and buttons of the EVB.
S201 S101 S102
S103
Figure 6: Switches and Buttons
Table 3: Switches and Buttons
Part No.
Name
I/O
Description
S101
NSTANDBY
DI
1. Long press (press and hold) the NSTANDBY button to enter
standbymode, and release the buttonto exit from standbymode.
2. Short press (press and then release) the NSTANDBY button to
reset the module.
S102
BOOT
DI
Press and hold the BOOT button during EVB power-on to make the
module enter host mode.
S103
WAKE_UP
DI
On the EVB, the module will enter sleep mode after sending

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3.4. Operation Status Indication LEDs
D101
D103
Figure 7: Operation Status Indication LEDs
Table 4: Operation Status Indication LEDs
$PQSETSLEEP,1 command.
Long press WAKE_UP button to exit from sleep mode, and then
send $PQSTARTGNSS to start the GNSS engine.
S201
POWER
PI
EVB power on/off switch
Part No.
Name
I/O
Description
D101
1PPS
DO
Flash: successful fix. The frequency is 1Hz.
Extinct: no fix.
D103
TXD
DO
Flash: the module is turned on successfully, and the micro USB port can
output NMEAmessages.
Extinct: failed to turn on the module.

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3.5. Test Points
The following figure illustrates the test points of the EVB.
1
2
3
4
5
6
7
8
9
10
Figure 8: J104 test points
Table 5: Pin Description of J104
Pin No.
Signal
I/O
Description
1
CTS
DI
Clear to send
2
RTS
DO
Request to send
3
REQ
DO
Data availability indication, used to indicate
whether there is data available for reading
4
RXD
DI
Receive data
5
1PPS
DO
One pulse per second
6
TXD
DO
Transmit data
7
AP_REQ
DI
AP request to send
8
STDBY
DI
Standby mode control
9
RDY
DO
Reserved
10
GND
-
Ground

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1234 5
Figure 9: J105 Test Points
Table 6: Pin Description of J105
Pin No.
Signal
I/O
Description
1
SDA
OD
I2C serial clock
2
SCL
OD
I2C serial data
3
INT
DI
Interrupt
4
GND
-
Ground
5
VCC_1.8V
PO
1.8V output power supply

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4EVB Operation Procedures
This chapter mainly illustrates the operation procedures of LC79D (A) EVB.
4.1. Firmware Download
The module supports firmware download in both normal working mode and host mode.
4.1.1. Firmware Download in Normal Working Mode
Step 1: Connect the EVB to a PC with a micro USB cable.
Step 2: Turn on the POWER switch (S201) to power on the EVB.
Step 3: Run the GNSSFlashTool and then configure the tool as shown below.
Figure 10: GNSSFlashTool Configurations for Firmware Upgrade

Please make sure the module is in full on mode before downloading firmware in normal working mode.
NOTE

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4.1.2. Firmware Download in Host Mode
Step 1: Connect the EVB to a PC with a micro USB cable.
Step 2: Press and hold the BOOT button during EVB power-on to make the module enter host mode.
After the module enters host mode successfully, release the BOOT button.
Step 3: Run the GNSSFlashTool and then configure the tool as shown below.
Figure 11: GNSSFlashTool Configurations for Host Mode Download
4.2. Communication via Micro USB Interface
Step 1: Connect the EVB to a PC with a micro USB cable through the micro USB interface, and then turn
on the POWER switch (S201) to power on the EVB.
Step 2: Run the USB flash drive on PC to install the USB driver. The USB port numbers can be viewed
through the PC Device Manager, as shown below.
Figure 12: USB Ports
Step 3: Install and then use the QCOM tool provided by Quectel to realize the communication between
the module and the PC.
The following figure shows the COM Port Setting interface of QCOM: select the correct “COM
Port” (USB port number shown in the above figure) and set the correct “Baudrate” (the default
value: 115200bps). For more details of the usage of QCOM, please refer to document [4].

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Figure 13: COM Port Setting Interface of QCOM

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5Usage of QGNSS
QGNSS tool is used to check the status of GPS, GLONASS, BeiDou, Galileo and IRNSS receivers. This
chapter mainly introduces how to use the tool while operating the EVB. For more details of the usage of
QGNSS, please refer to document [5].
5.1. COM and Baud Rate Setting
After successful EVB connection, turn on the module and start up the QGNSS.
Click “Connect UART”, select correct COM port and baud rate (115200bps by default), and then click
“OK”.
Figure 14: COM Port and Baud Rate Selection
After the tool is opened, the following interface in default layout will be shown:

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Figure 15: QGNSS Interface
Through the QGNSS interface, users will be able to check GNSS receiver information such as CNR
message, time, position, satellite information, precision and so on.
5.2. PQ Command Sending
PQ commands can be sent through QGNSS. For more details about PQ commands, please refer to
document [2].
Figure 16: PQ Command Sending via QGNSS