AT Commands Reference (GM02S)
This page presents a curated list of AT Commands for the GM02S modem. The complete reference manual can be located here.
Set Phone Functionality: AT+CFUN
Use this command to connect and disconnect the cellular network
Command: AT+CFUN=<n>
Parameters
n=0
: Minimum Functionality (No Connection)n=1
: Full Functionality (Connection)n=4
: Disabled RF, SIM access possiblen=5
: Manufacturing Mode
Example - Connect to the Network
AT+CFUN=1
OK
+CEREG: 2
+CEREG: 5,...
Software Reset: AT^RESET
Issues a software reset to the modem
Command: AT^RESET
Example
AT^RESET
OK
+SHUTDOWN
+SYSSTART
Print Firmware Version: ATI1
Prints the current modem firmware version
Command: ATI1
Example
ATI1
UE8.0.5.10
LR8.0.5.10-55042
OK
Select LTE Frequency Bands: AT+SQNBANDSEL
The GM02S modem supports up to 19 frequency bands that will be scanned in order to make connection, this can worst case take several minutes. The subset of bands to scan is pre-set per operator, in order to reduce connection time the number of bands, this command can be used.
Command: AT+SQNBANDSEL=<rat>,<operator>,<bandList>
Parameters:
rat
: Radio Technologyrat=0
: M1rat=1
: NB1
operator
: Operator NamebandList
: List of auhtorized LTE bands, comma separated
Example
The example below shows how to configure only band 20 for operator "truphone"
AT+SQNBANDSEL=0,"truphone","20"
+SQNBANDSEL: 0,truphone,"20"
OK
Get Signal Quality: AT+CSQ
Get the current signal quality. Specifically, the signal strength indication <rssi>
and channel bit error rate <ber>
.
Command: AT+CSQ
Returns: +CSQ:<rssi>,<ber>
Value | Description |
---|---|
0 | -113 dBM or less |
1 | -111 dBm |
2 .. 30 | -109 to -53 dBm |
31 | -51 dBm or greater |
99 | Not known or not detectable |
Value | Description |
---|---|
0..7 | RXQUAL values found in the table 3GPP TS 45.008 subclause 8.2.4 |
99 | Not known or not detectable |
Example
AT+CSQ
+CSQ: 22,99
OK