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Chapter 20 – Reference Information
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 170
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 dumber
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 APMS mode, only the voice call is applicable. Although user can still issue almost all of AT
commands, the most of the AT commands are not applicable for AMPS operation, e.g. data commands,
SMS, FAX, RUIM commands, service programming etc.
The following table list the AT commands that are meaningful for AMPS operation. Please note that these
listed AT 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 Modem Information (x = 0-7)
12 +IPR Set modem baud rate
13 +CNUM Display modem directory #
14 +CGSN Display modem ESN # (in hex format)
15 +CMEE Display the error code
16 +WPRL Read the PRL version
17 +CPOF Modem OFF mode
18 +CFUN Reset the modem