
Chapter 1 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H) 29
+GMR Revision Request
Description: Displays the version of the modem code.
Syntax: AT+GMR? or AT+GMR=?
Reports: +GMR? Reports current or selected options.
+GMR=? Reports supported options.
Result Code: OK
+IFC DTE-DCE Local Flow Control
Description: Use this command to select the local flow control method. The input parameters of
the +IFC command overwrite the settings of the \Q and \X<value> commands. The
reverse is also true. By modifying the settings of the \Q and \X<value> commands,
the +IFC command parameters are overwritten.
Syntax: AT+IFC=<DCE_by_DTE>,<DTE_by_DCE>
Values: +IFC=0,0 No flow control.
+IFC=1,1 Software flow control.
+IFC=2,2 Hardware flow control. (Default)
Reports: +IFC? Reports current or selected options.
+IFC=? Reports supported options.
Result Codes: OK
ERROR
+ILRR DTE-DCE Local Rate Reporting
Description: Use this command to display or hide the local rate report result code. If the rate
report is enabled, the reported <rate> is the current DTE-DCE rate. The rate report is
transmitted after any modulation, error control, or data compression reports, and
before the final result code (e.g., CONNECT).
Syntax: AT+ILRR=<value>
Values: 0 Disables the local rate report. (Default)
1 Enables the local rate report.
Reports: +ILRR? Reports current or selected options.
+ILRR=? Reports supported options.
Result Codes: OK
ERROR
+IPR Fixed DTE Rate
Description: Use this command to set the DTE to DCE transmission rate. There are twelve fixed
transmission rates used by the DTE to communicate with the DCE. These commands
select one of the predefined transmission rates. If a rate is entered which is not
supported, the transmission rate defaults to the next lower rate.
Syntax: AT+IPR=<DTE rate>
Values: +IPR=0 Automatic rate detection. (Default)
+IPR=110 100 bits/s
+IPR=300 300 bits/s
+IPR=600 600 bits/s
+IPR=1200 1200bits/s
+IPR=2400 2400 bits/s
+IPR=4800 4800 bits/s
+IPR=9600 9600 bits/s
+IPR=14400 14400 bits/s
+IPR=19200 19200 bits/s
+IPR=38400 38400 bits/s
+IPR=57600 57600 bits/s
+IPR=115200 115200 bits/s
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