L26 EVB User Guide
GNSS Module Series
Rev. L26_EVB_User_Guide_V1.0
Date: 2013-04-26
www.quectel.com
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About the document
History
Revision
Date
Author
Description
1.0
2013-04-22
Ada LI
Initial
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Contents
About the document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 4
Figure Index ................................................................................................................................................. 5
1 Introduction .......................................................................................................................................... 6
2 Introduction to EVB Kit ....................................................................................................................... 7
2.1. EVB Top and Bottom View .......................................................................................................... 7
2.2. EVB Accessories ......................................................................................................................... 9
3 Interface Application ......................................................................................................................... 10
3.1. USB Interface ............................................................................................................................ 10
3.2. UART Interface.......................................................................................................................... 11
3.3. Antenna Interface ...................................................................................................................... 12
3.4. Switches and Buttons ............................................................................................................... 12
3.5. Operating Status LEDs ............................................................................................................. 14
3.6. Test Points ................................................................................................................................. 15
4 EVB and Accessories ........................................................................................................................ 17
5 Install Device Driver ........................................................................................................................... 18
6 Starting PowerGPS ............................................................................................................................ 19
7 Appendix A Reference ....................................................................................................................... 22
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Table Index
TABLE 1: PINS OF UART PORT ....................................................................................................................... 11
TABLE 2: SWITCHES AND BUTTONS ............................................................................................................. 13
TABLE 3: OPERATING STATUS LEDS ............................................................................................................ 14
TABLE 4: PINS OF J106 ................................................................................................................................... 15
TABLE 5: EXPLANATIONS OF POWERGPS WINDOW .................................................................................. 20
TABLE 6: REFERENCE .................................................................................................................................... 22
TABLE 7: ABBREVIATIONS .............................................................................................................................. 22
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Figure Index
FIGURE 1: EVB TOP VIEW ................................................................................................................................ 7
FIGURE 2: EVB BOTTOM VIEW ........................................................................................................................ 8
FIGURE 3: EVB ACCESSORIES ........................................................................................................................ 9
FIGURE 4: MICRO-USB INTERFACE .............................................................................................................. 10
FIGURE 5: UART INTERFACE .......................................................................................................................... 11
FIGURE 6: ANTENNA INTERFACE .................................................................................................................. 12
FIGURE 7: LNA LAYOUT .................................................................................................................................. 12
FIGURE 8: SWITCHES AND BUTTONS .......................................................................................................... 13
FIGURE 9: OPERATING STATUS LEDS .......................................................................................................... 14
FIGURE 10: TEST POINTS J106 ...................................................................................................................... 15
FIGURE 11: EVB AND ACCESSORY EQUIPMENTS ...................................................................................... 17
FIGURE 12: POWERGPS TOOL ...................................................................................................................... 19
FIGURE 13: MTK COMMAND .......................................................................................................................... 21
FIGURE 14: STATIC TTFF TESTING ............................................................................................................... 21
FIGURE 15: STATIC TTFF TESTING CONFIGURATION OPTIONS ............................................................... 21
FIGURE 16: STATIC TTFF TESTING CONFIGURATION ................................................................................ 21
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1 Introduction
This document defines and specifies the usage of L26 EVB (Evaluation Board). You can get useful
information about L26 EVB and GNSS demo tool from this document.
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2 Introduction to EVB Kit
2.1. EVB Top and Bottom View
Figure 1: EVB Top View
H
I
G
F
E
A
B
C
D
J
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Figure 2: EVB Bottom View
A: UART port
B: Serial port alternation switch
C: RESET button
D: FORCE_ON button
E: POWER switch
F: Micro-USB port
G: Indication LEDs
H: Antenna interface
I: L26 Module
J: Test points
H
A
F
G
J
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2.2. EVB Accessories
Figure 3: EVB Accessories
A: USB cable
B: GNSS active antenna (3.3V)
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3 Interface Application
3.1. USB Interface
Figure 4: Micro-USB Interface
The main power is supplied via Micro-USB interface. We provide two ways for data communication:
Micro-USB and UART interface which are controlled by alternation switch (S2). Both of RS232 and
Micro-USB cable are necessary, if you want to use UART to output NEMA. So the easy way is to use
Micro-USB cable which both supplies the power and outputs NEMA. You can makes alternation
between UART port and Micro-USB interfaces via switch (S2).
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3.2. UART Interface
Figure 5: UART Interface
Table 1: Pins of UART port
Pin
Signal
I/O
Description
2
RXD
I
Receive data
3
TXD
O
Transmit data
5
GND
GND
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3.3. Antenna Interface
Figure 6: Antenna Interface
3.4. Switches and Buttons
Antenna
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Figure 7: Switches and Buttons
Table 2: Switches and Buttons
Part
Name
I/O
Description
S1
POWER
I
Control power supply from Micro-USB.
S2
Serial port alternation
switch
I
Quectel EVB supplies two communicative
ways: Micro-USB and UART which are
controlled by switch.
K1
FORCE_ON
Press and release the button, the module will
be waked up from backup mode.
K2
RESET
I
Press and release this button, then the
module will reset.
S2
K2
K1
S1
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3.5. Operating Status LEDs
Figure 8: Operating Status LEDs
Table 3: Operating status LEDs
Part
Name
I/O
Description
L1
TXD1
O
Flash: turn on successfully, Micro-USB or UART1
port can output messages.
Extinct: fail to turn on the module
L2
1PPS
O
Flash: fix successfully, the frequency is 1Hz
Extinct: no fix
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3.6. Test Points
Figure 9: Test Points J106
Table 4: Pins of J106
Pin
Signal
I/O
Description
1/10
GND
Ground
2
STANDBY
Reserved
3
1PPS
O
1 pulse per second
4
AADET_N
I
Active antenna open circuit detection
5
32K/DRIN
Reserved
6
FORCE_ON
Logic high will force module to be waked up from
backup mode. Keep this pin open or pulled low
1
2
4
5
6
7
8
9
10
3
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before entering into backup mode. If unused, keep
this pin open.
7
RESET
I
System reset
8
TXD1
O
Transmit data
9
RXD1
I
Receive data
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4 EVB and Accessories
The EVB and its accessories are equipped as shown in Figure 10.
Figure 7: EVB and Accessory Equipments
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5 Install Device Driver
Before using Micro-USB port, please install the driver of Micro-USB. Customer can login our FTP for
download device driver. Overseas FTP path is /d:/FTP/OC/Overseas_Technical/Overseas_Module
Official Documents/GNSS Module/Common/04 Tool Kit/ GNSS_EVB_Micro-USB_Driver_CP210x.
Domestic FTP path is /d:/FTP/CC/Domestic_Technical/Domestic_Module Official Documents/GNSS
Module/Common/04 Tool Kit/ GNSS_EVB_Micro-USB_Driver_CP210x.
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6 Start PowerGPS
The PowerGPS version is V2.2.0. The PowerGPS tool can help user to view the status of
GPS&GLONASS receiver conveniently. When the tool is opened, the following window will be displayed:
Figure 8: PowerGPS Tool
After EVB accessories are assembled, turn on the module and start up the PowerGPS. Select a correct
COM port and baud rate (L26 module supports 9600bps by default), then click the button “Create
Connection”.
From the PowerGPS window, user can view CNR message, time, position, speed, precision and so on.
Explanations are listed in Table 5.
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Table 5: Explanations of PowerGPS Window
Icon
Explanation
SV with PRN 65. If the position of SV is near to the centre of the
Sky View, the elevation angle of SV is close to 90°. Dark blue
means this satellite is in tracking.
Light blue means this satellite is not in tracking.
The CNR of PRN 25 is 31dB/Hz. Light blue column means the
navigation data of this satellite is in use.
The CNR of PRN 70 is 32dB/Hz. White column means the
navigation data of this satellite is not in use. The range of
GLONASS SVID is 65-96.
UTC time
Latitude degree
longitude degree
Positing fix
Using the number of satellites
Horizontal Dilution of Precision
Altitude based on WGS84 Datum
UTC date
Fix type: No-Fix, 3D or 2D SPS
Using satellite
Position Dilution of Precision
Vertical Dilution of Precision
Speed of receiver
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PMTK Command
You can send PMTK command by PowerGPS. The format of PMTK command is included only characters
between „$‟ and „*‟, for example: PMTK869,0.
Figure 9: MTK Command
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7 Appendix A Reference
Table 6: Reference
SN
Document name
Remark
[1]
L26_Hardware_Design
L26 Hardware Design
[2]
L26_Protocol_Specification
L26 Protocol Specification
[3]
L26_Reference_Design
L26 Reference Design
Table 7: Abbreviations
Abbreviation
Description
CNR
Carrier-to-Noise Ratio
GPS
Global Positioning System
GLONASS
Global Navigation Satellite System (The Russian GNSS)
GNSS
Global Navigation Satellite System
LED
Light Emitting Diode
PPS
Pulse Per Second
PRN
Pseudorandom Noise
SPS
Standard Positioning Service
SV
Satellite Vehicle
UART
Universal Asynchronous Receiver & Transmitter
UTC
Universal Time Coordinated
WGS84
World Geodetic System 1984
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