Specifications

AT Command Set Reference
Ver. 1.00
GSM1308AT001 Page 433 Ver. 1.00 – 10/29/2008
AT$VGT Speaker Transmit Gain
Default Value: 12
Default Value Meaning: Coarse transmit speaker gain is +6 dB.
AT$VLVL Speaker Volume
Default Value: 4
Default Value Meaning: Speaker volume is set to –6 dB.
AT$VST Sidetone Volume
Default Value: 4
Default Value Meaning: Side tone volume set to –14 dB.
AT$IOCFG GPIO Configuration
Default Value: 11111111 11111111
Default Value Meaning: All I/O set to input, current status: all input.
AT$IOGP(x) GPIO Bit Control
Default Value: 1
Default Value Meaning: I/O bit enabled.
AT$IOGPA GPIO Byte Control
Default Value: 11111111 11111111
Default Value Meaning: All I/O pins enabled, current status: all enabled.
AT$GATEWAY Gateway IP
Default Value: 0.0.0.0
Default Value Meaning: No Gateway IP defined.
AT$VSELECT Voice Select
Default Value: 0
Default Value Meaning: Selects handset for voice
AT$SPKCFG Set Downlink Voice Parameters
Default Value: 8,4,0
Default Value Meaning: 2 dB of gain, -6 dB of volume, filter on
AT$PREAMP Set Uplink Voice Parameters
Default Value: 0,20,0
Default Value Meaning: 2V bias, 8 dB of gain, 0 dB of extra gain.
AT$TCPAPI TCP API Control
Default Value: 0
Default Value Meaning: TCP API Disabled