Specifications

Chapter 19 – Reference Information
Multi-Tech Systems, Inc. CDMA AT Commands Reference Guide (PN S000294K) 149
AT Commands Supported When SIM Card Removed
The following lists the AT commands that are supported in a RUIM modem (the modem needs a SIM card to operate) when
the SIM card is not present.
# List AT Command Note and Explanation
1 +IPR Set modem fixed baud rate
2 +CMEE Display the error code
3 +CCLK Clock management
4 +CBC Battery charge
5 +WIND General status indication
6 ATE Set modem local echo
7 +CPOF Modem Offline mode
8 +CFUN Reset the modem
9 +WGMI Manufacturer identification
10 +WGMM Model identification
11 +CGMR Revision identification
12 +CGSN Electronic serial number
13 +CSCS TE character set selection
14 +CPAS Phone activity status
15 +CRMP Ring melody playback
16 +CRSL Ringer sound level
17 +CSQ Signal quality
18 +CREG Network registration and roaming
19 $QCDMG Transition to diagnostics monitor
20 ATIx Request Modem Information (x = 0-7)
AT Commands for AMPS Operation
In the AMPS mode, only the voice call is applicable. Although you can issue almost all AT commands, most of the commands
are not applicable for AMPS operation; e.g., data commands, SMS, RUIM commands, service programming etc.
The following table lists the AT commands that are meaningful for AMPS operation. Please note that these commands are
also applicable in CDMA operations.
# List AT command Note and Explanation
1 +COPS +COPS=2,n (n=0,1)
2 ATD Making a voice call
3 ATA Answer a voice call
4 ATDL Redial last #
5 +VGR Change the receiving voice volume
6 +VGT Change the transmitting voice volume
7 +CMUT Mute the microphone
8 A/ Repeat last command
9 ATS0 Set auto answer
10 ATH Hang up a voice call
11 ATIx Request Module Information (x = 0-7)
12 +IPR Set module baud rate
13 +CNUM Display module directory #
14 +CGSN Display module ESN # (in hex format)
15 +CMEE Display the error code
16 +WPRL Read the PRL version
17 +CPOF Module OFF mode
18 +CFUN Reset the module