Quectel MC20 GNSS AT Commands Manual V1.1

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MC20 GNSS
AT Commands Manual
GSM/GPRS/GNSS Module Series
Rev. MC20_GNSS_AT_Commands_Manual_V1.1
Date: 2016-07-30
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Copyright © Quectel Wireless Solutions Co., Ltd. 2016. All rights reserved.
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About the Document
History
Revision
Date
Author
Description
1.0
2016-06-24
Hyman DING
Initial
1.1
2016-07-30
Hyman DING
Added the following new AT commands:
AT+QGNSSTS/AT+QGNSSEPO/
AT+QGREFLOC/AT+QGEPOAID
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Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 4
1 Introduction .......................................................................................................................................... 5
2 AT Commands for MC20 GNSS .......................................................................................................... 6
2.1. Overview of AT Commands for MC20 GNSS ............................................................................. 6
2.1.1. AT+QGNSSC Control Power Supply of GNSS Module ................................................ 6
2.1.2. AT+QGNSSRD Read GNSS Navigation Information ................................................... 7
2.1.3. AT+QGNSSCMD Send Commands to GNSS Module ................................................. 8
2.1.4. AT+QGNSSTS Get Time Synchronization Status for GNSS Module ........................... 8
2.1.5. AT+QGNSSEPO Enable/Disable EPOTM Function ....................................................... 9
2.1.6. AT+QGREFLOC Set Reference Location Information for QuecFastFix Online ......... 10
2.1.7. AT+QGEPOAID Trigger EPOTM Function ................................................................... 11
3 Examples ............................................................................................................................................ 12
3.1. AT+QGNSSC ............................................................................................................................ 12
3.2. AT+QGNSSRD .......................................................................................................................... 12
3.3. AT+QGNSSCMD....................................................................................................................... 13
3.4. AT+QGNSSTS .......................................................................................................................... 13
3.5. AT+QGNSSEPO ....................................................................................................................... 13
3.6. AT+QGREFLOC ........................................................................................................................ 14
3.7. AT+QGEPOAID ......................................................................................................................... 14
3.8. Complete Example for Operating EPOTM and QuecFastFix Online ......................................... 15
4 Appendix ............................................................................................................................................. 17
4.1. Related Documents ................................................................................................................... 17
4.2. Terms and Abbreviations ........................................................................................................... 17
4.3. Summary of CME ERROR Codes Related to GNSS ............................................................... 18
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Table Index
TABLE 1: OVERVIEW OF AT COMMANDS FOR MC20 GNSS ................................................................. 6
TABLE 2: RELATED DOCUMENTS .......................................................................................................... 17
TABLE 3: TERMS AND ABBREVIATIONS ................................................................................................ 17
TABLE 4: DIFFERENT CODING SCHEMES OF +CME ERROR RELATED TO GNSS: <ERR> ............ 18
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1 Introduction
GNSS, a featured function embedded in Quectel MC20 module, can help customers get the current
accurate coordinates, high precision time, etc.
MC20 integrates both GNSS and GSM engines which can work as a whole (all-in-one solution) unit or
work independently (stand-alone solution) according to customer demands. In all-in-one solution, the
internal GNSS module can be regarded as a peripheral of the whole unit, and is completely controlled by
the GSM module, including power supply, UART communication, etc. In stand-alone solution, the internal
GNSS module and the GSM module work independently, and the GNSS has to be controlled separately.
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2 AT Commands for MC20 GNSS
2.1. Overview of AT Commands for MC20 GNSS
The commands below are effective only in all-in-one solution.
Table 1: Overview of AT Commands for MC20 GNSS
2.1.1. AT+QGNSSC Control Power Supply of GNSS Module
The command is used to control the power supply of GNSS module.
Command
AT+QGNSSC
AT+QGNSSRD
AT+QGNSSCMD
AT+QGNSSETS
AT+QGNSSEPO
AT+QGREFLOC
AT+QGEPOAID
AT+QGNSSC Control Power Supply of GNSS Module
Test Command
AT+QGNSSC=?
Response
+QGNSSC: (list of supported <mode>s)
OK
Read Command
AT+QGNSSC?
Response
+QGNSSC: <mode>
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Parameter
In stand-alone solution, the power supply of GNSS is controlled by an external circuit rather than the PIN
GPS_VCC_EN. In such case, command AT+QGNSSC cannot be used and thus can be ignored.
2.1.2. AT+QGNSSRD Read GNSS Navigation Information
The command is used to get the GNSS navigation information.
Parameter
OK
Write Command
AT+QGNSSC=<mode>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
<mode> 0 Power off GNSS module
1 Power on GNSS module
AT+QGNSSRD Read GNSS Navigation Information
Test Command
AT+QGNSSRD=?
Response
+QGNSSRD: (list of supported <item>s)
OK
Read Command
AT+QGNSSRD?
Response
+QGNSSRD: (information of all supported <item>s)
OK
Write Command
AT+QGNSSRD=<item>
Response
+QGNSSRD: (information of <item>s)
OK
If error is related to ME functionality:
+CME ERROR: <err>
<item> NMEA/GGA: Get GGA sentence
NMEA/GLL: Get GLL sentence
NOTE
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2.1.3. AT+QGNSSCMD Send Commands to GNSS Module
The command is used to send commands to GNSS module, which allows customers to optionally use
some functions to meet application demands.
Parameter
Currently only <cmdType>=0 is supported.
2.1.4. AT+QGNSSTS Get Time Synchronization Status for GNSS Module
The command is used to get time synchronization status for GNSS module. Time plays a very important
role in EPOTM function.
NMEA/GSA: Get GSA sentence
NMEA/GSV: Get GSV sentence
NMEA/RMC: Get RMC sentence
NMEA/VTG: Get VTG sentence
AT+QGNSSCMD Send Commands to GNSS Module
Test Command
AT+QGNSSCMD=?
Response
+QGNSSCMD: (0,1),cmdString
OK
Write Command
AT+QGNSSCMD=<cmdType
>,<cmdString>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
<cmdType> 0 NMEA style command
1 Hex style command
<cmdString> Command string
AT+QGNSSTS Get Time Synchronization Status for GNSS Module
Test Command
AT+QGNSSTS=?
Response
+QGNSSTS: <status>
NOTE
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Parameter
Exact time is very important to EPOTM function. So customers must ensure the time is valid before using
EPOTM function.
2.1.5. AT+QGNSSEPO Enable/Disable EPOTM Function
The command is used to enable or disable EPOTM function.
Parameter
OK
Read Command
AT+QGNSSTS?
Response
+QGNSSTS: <status>
OK
<status> 0 Time is not synchronized
1 Time is synchronized successfully
AT+QGNSSEPO Enable/Disable EPOTM Function
Test Command
AT+QGNSSEPO=?
Response
+QGNSSEPO: (list of supported <mode>s)[,<account_id>]
OK
Read Command
AT+QGNSSEPO?
Response
+QGNSSEPO: <mode>,<account_id>
OK
Write Command
AT+QGNSSEPO=<mode>[,<
account_id>]
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
<mode> 0 Disable EPOTM function
1 Enable EPOTM function
<account_id> 2 Set account ID for EPOTM function
NOTE
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The parameter <account_id> only supports 2. It can be omitted when input, and in this case, 2 will be
used as the default value.
2.1.6. AT+QGREFLOC Set Reference Location Information for QuecFastFix Online
The command is used to set reference location information for QuecFastFix Online function.
Parameter
1. The range of <ref_latitude> is -90°~90°North Latitude, and the range of <ref_longitude> is
-180°~180 East Longitude. The input format of the parameter should retain 6 decimal places, and the
unit is degree.
2. The command works for QuecFastFix Online function and should be set before executing
AT+QGNSSEPO=1.
AT+QGREFLOC Set Reference Location Information for QuecFastFix Online
Test Command
AT+QGREFLOC=?
Response
+QGREFLOC: <ref_latitude>,<ref_longitude>
OK
Read Command
AT+QGREFLOC?
Response
+QGREFLOC: <ref_latitude>,<ref_longitude>
OK
Write Command
AT+QGREFLOC=<ref_latitud
e>,<ref_longitude>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
<ref_latitude> Latitude information of the reference location
<ref_longitude> Longitude information of the reference location
NOTE
NOTES
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2.1.7. AT+QGEPOAID Trigger EPOTM Function
The command is used to trigger EPOTM function.
1. If GNSS is powered on already, customers could use this command to trigger EPOTM function after
executing AT+QGNSSEPO=1.
2. If execute AT+QGNSSEPO=1 first and then power on GNSS, executing this command will not trigger
EPOTM function.
AT+QGEPOAID Trigger EPOTM Function
Test Command
AT+QGEPOAID=?
Response
OK
Active Command
AT+QEPOAID
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
NOTES
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3 Examples
3.1. AT+QGNSSC
AT+QGNSSC? // Query GNSS power status
+QGNSSC: 0 // GNSS powered off
OK
AT+QGNSSC=1 // Power on GNSS
OK
3.2. AT+QGNSSRD
AT+QGNSSRD? // Inquire GNSS NMEA sentence
+QGNSSRD: $GNRMC,033836.000,A,3150.8272,N,11711.9889,E,0.00,140.50,140716,,,D*72
$GNVTG,140.50,T,,M,0.00,N,0.00,K,D*26
$GNGGA,033836.000,3150.8272,N,11711.9889,E,2,10,0.96,166.6,M,0.0,M,,*4A
$GPGSA,A,3,28,16,09,27,08,07,30,,,,,,1.52,0.96,1.17*01
$BDGSA,A,3,04,07,10,,,,,,,,,,1.52,0.96,1.17*1F
$GPGSV,3,1,10,08,64,016,51,07,61,300,28,42,42,134,34,30,34,315,42*7E
$GPGSV,3,2,10,27,32,043,45,16,25,085,43,09,17,227,39,28,08,294,30*7D
$GPGSV,3,3,10,26,02,102,,193,,,*76
$BDGSV,3,1,09,10,76,324,44,08,76,235,,07,73,125,44,15,48,226,28*6A
$BDGSV,3,2,09,01,47,141,27,12,41,240,27,02,38,231,,04,32,119,39*69
$BDGSV,3,3,09,05,18,252,27*5D
$GNGLL,3150.8272,N,11711.9889,E,033836.000,A,D*40
OK
AT+QGNSSRD=NMEA/RMC // Inquire RMC information
+QGNSSRD: $GNRMC,033837.000,A,3150.8272,N,11711.9889,E,0.00,140.50,140716,,,D*73
OK
AT+QGNSSRD=NMEA/GSA // Inquire GSA information
+QGNSSRD: $GPGSA,A,3,28,16,09,27,08,07,30,,,,,,1.52,0.96,1.17*01
$BDGSA,A,3,04,07,10,,,,,,,,,,1.52,0.96,1.17*1F
OK
AT+QGNSSRD? // Inquire GNSS NMEA sentence
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+QGNSSRD: $GNRMC,033839.000,A,3150.8272,N,11711.9889,E,0.00,140.50,140716,,,D*7D
$GNVTG,140.50,T,,M,0.00,N,0.00,K,D*26
$GNGGA,033839.000,3150.8272,N,11711.9889,E,2,10,0.96,166.6,M,0.0,M,,*45
$GPGSA,A,3,28,16,09,27,08,07,30,,,,,,1.52,0.96,1.17*01
$BDGSA,A,3,04,07,10,,,,,,,,,,1.52,0.96,1.17*1F
$GPGSV,3,1,10,08,64,016,51,07,61,300,26,42,42,134,34,30,34,315,42*70
$GPGSV,3,2,10,27,32,043,46,16,25,085,43,09,16,226,39,28,08,294,30*7E
$GPGSV,3,3,10,26,02,102,,193,,,*76
$BDGSV,3,1,09,10,76,324,44,08,76,235,,07,73,125,44,15,48,226,28*6A
$BDGSV,3,2,09,01,47,141,27,12,41,240,27,02,38,231,,04,32,119,39*69
$BDGSV,3,3,09,05,18,252,27*5D
$GNGLL,3150.8272,N,11711.9889,E,033839.000,A,D*4F
OK
3.3. AT+QGNSSCMD
AT+QGNSSCMD=0,"$PMTK605*31" // Inquire GNSS version information
OK
+QGNSSCMD: $PMTK705,AXN_3.82_3333_16051101,0001,MC20-GNSS,1.0*2A
3.4. AT+QGNSSTS
AT+QGNSSTS=? // Test command
+QGNSSTS: (0,1)
OK
AT+QGNSSTS? // Read time synchronization mode and status
+QGNSSTS: 1 // Time synchronized successfully
OK
3.5. AT+QGNSSEPO
AT+QGNSSEPO=? // Test command
+QGNSSEPO: (0,1)[,<account_id>]
OK
AT+CREG?;+CGREG? // Check network status
+CREG: 0,1
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+CGREG: 0,1
OK
AT+QGNSSEPO=1 // Enable EPOTM function
OK
AT+QGNSSEPO? //Read EPOTM status
+QGNSSEPO: 1,2
OK
3.6. AT+QGREFLOC
AT+QGREGLOC=? // Test command
+QGREFLOC: <ref_latitude>,<ref_longitude>
OK
AT+QGREFLOC=31.507985,117.119750
OK
3.7. AT+QGEPOAID
AT+QGNSSC=1 // Power on GNSS
OK
AT+CREG?;+CGREG? // Check network status
+CREG: 0,1
+CGREG: 0,1
OK
AT+QGNSSTS? // Inquire time synchronization status
+QGNSSTS: 1
OK
AT+QGNSSEPO=1
OK
AT+QGEPOAID
OK
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3.8. Complete Example for Operating EPOTM and QuecFastFix Online
AT+QGNSSC=1 // Power on GNSS
OK
AT+QIFGCNT=2
OK
AT+QICSGP=1,CMNET
OK
AT+QGNSSTS? // Read time synchronization status
+QGNSSTS: 0
OK
AT+CREG?;+CGREG? // Check network status
+CREG: 0,2
+CGREG: 0,2
OK
AT+CREG?;+CGREG? // Check network status
+CREG: 0,1
+CGREG: 0,1
OK
AT+QGNSSTS? // Read time synchronization status
+QGNSSTS: 1 // Time synchronization completed
OK
AT+QGREFLOC=31.507985,117.119750 // Set reference location information for QuecFastFix Online
OK
AT+QGNSSEPO=1 // Enable EPOTM function
OK
AT+QGEPOAID // Trigger EPOTM function
OK
AT+QGNSSRD?
+QGNSSRD: $GNRMC,032220.291,V,,,,,0.00,0.00,140716,,,N*5D
$GNVTG,0.00,T,,M,0.00,N,0.00,K,N*2C
$GNGGA,032220.291,,,,,0,0,,,M,,M,,*5D
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$BDGSA,A,1,,,,,,,,,,,,,,,*0F
$GPGSV,2,1,07,23,,,31,08,,,49,30,,,33,16,,,45*7E
$GPGSV,2,2,07,07,,,44,27,,,49,26,,,43*72
$BDGSV,1,1,03,10,,,47,04,,,40,07,,,48*62
$GNGLL,,,,,032220.291,V,N*6F
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OK
AT+QGNSSRD?
+QGNSSRD: $GNRMC,032221.301,V,,,,,0.00,0.00,140716,,,N*54
$GNVTG,0.00,T,,M,0.00,N,0.00,K,N*2C
$GNGGA,032221.301,,,,,0,0,,,M,,M,,*54
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$BDGSA,A,1,,,,,,,,,,,,,,,*0F
$GPGSV,2,1,07,23,,,31,08,,,49,30,,,33,16,,,45*7E
$GPGSV,2,2,07,07,,,44,27,,,49,26,,,43*72
$BDGSV,1,1,03,10,,,47,04,,,40,07,,,48*62
$GNGLL,,,,,032221.301,V,N*66
OK
AT+QGNSSRD?
+QGNSSRD: $GNRMC,032225.306,A,3150.7859,N,11711.9215,E,0.06,204.08,140716,,,A*70
$GNVTG,204.08,T,,M,0.06,N,0.11,K,A*2B
$GNGGA,032225.306,3150.7859,N,11711.9215,E,1,9,1.54,35.0,M,0.0,M,,*40
$GPGSA,A,3,08,30,16,07,27,26,,,,,,,1.75,1.54,0.83*00
$BDGSA,A,3,10,04,07,,,,,,,,,,1.75,1.54,0.83*19
$GPGSV,3,1,09,08,70,004,49,07,55,309,44,42,45,141,,27,38,040,49*7D
$GPGSV,3,2,09,16,28,079,45,30,28,317,31,26,06,096,43,193,,,*7C
$GPGSV,3,3,09,23,,,28*7B
$BDGSV,1,1,03,07,74,113,48,10,74,329,47,04,32,119,40*51
$GNGLL,3150.7859,N,11711.9215,E,032225.306,A,A*4A
OK
AT+QGNSSRD?
+QGNSSRD: $GNRMC,032225.306,A,3150.7859,N,11711.9215,E,0.06,204.08,140716,,,A*70
$GNVTG,204.08,T,,M,0.06,N,0.11,K,A*2B
$GNGGA,032225.306,3150.7859,N,11711.9215,E,1,9,1.54,35.0,M,0.0,M,,*40
$GPGSA,A,3,08,30,16,07,27,26,,,,,,,1.75,1.54,0.83*00
$BDGSA,A,3,10,04,07,,,,,,,,,,1.75,1.54,0.83*19
$GPGSV,3,1,09,08,70,004,49,07,55,309,44,42,45,141,,27,38,040,49*7D
$GPGSV,3,2,09,16,28,079,45,30,28,317,31,26,06,096,43,193,,,*7C
$GPGSV,3,3,09,23,,,28*7B
$BDGSV,1,1,03,07,74,113,48,10,74,329,47,04,32,119,40*51
$GNGLL,3150.7859,N,11711.9215,E,032225.306,A,A*4A
OK
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4 Appendix
4.1. Related Documents
Table 2: Related Documents
SN
Document Name
Remark
[1]
NMEA 0183 Version 3.01
Standard for Interfacing Marine Electronic
Devices
[2]
Quectel_MC20_Hardware_Design
MC20 Hardware Design
4.2. Terms and Abbreviations
Table 3: Terms and Abbreviations
Abbreviation
Description
GGA
Global Positioning System Fixed Data
GLL
Geographic Position Latitude/Longitude
GNSS
Global Navigation Satellite System
GPS
Global Positioning System
GSA
GNSS DOP and Active Satellites
GSM
Global System for Mobile Communication
GSV
GNSS Satellites in View
ME
Mobile Equipment
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4.3. Summary of CME ERROR Codes Related to GNSS
Table 4: Different Coding Schemes of +CME ERROR Related to GNSS: <err>
NMEA
National Marine Electronics Association
RMC
Recommended Minimum Specific GNSS Data
VTG
Course Over Ground and Ground Speed
Code of <err>
Meaning
7101
Invalid parameter
7102
Not supported
7103
Operation failed
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