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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 possible
  • n=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

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 Technology
    • rat=0: M1
    • rat=1: NB1
  • operator: Operator Name
  • bandList: 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>

ValueDescription
0-113 dBM or less
1-111 dBm
2 .. 30-109 to -53 dBm
31-51 dBm or greater
99Not known or not detectable
ValueDescription
0..7RXQUAL values found in the table 3GPP TS 45.008 subclause 8.2.4
99Not known or not detectable

Example

AT+CSQ
+CSQ: 22,99

OK