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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 40
Command: +IFC DTE-Modem Local Flow Control
Description: This extended-format compound parameter controls the operation of local
flow control between the DTE and the modem during the data state when
V.42 error control is used, or when fallback to non-error control mode is
specified to include buffering and flow control.
It accepts two numeric subparameters.
Default: 2
Defined Values: Values defined by
<modem_by_DTE> Specifies the method to be used
by the DTE to control the flow of received data from the modem.
+IFC0 None
+IFC1 XON/XOFF on transmitted data (XON/XOFF on transmit data);
do not pass XON/XOFF characters to the remote modem.
+IFC2 Circuit 133 (Ready for Receiving).
+IFC3 DC1/DC3 on circuit 103 (Transmitted Data) with DC1/DC3
characters being passed through to the remote DCE in addition
to being acted upon for local flow control.
Values defined by
<DTE_by_modem> Specifies the method to be used
by the modem to control the flow of transmitted data from the DTE.
+IFC0 None.
+IFC1 XON/XOFF on received data.
+IFC2 CTS/RTS.
Report Commands: +IFC? Reports the current or selected values
Response: +IFC: <modem_by_DTE>,<DTE_by_modem>
Example: +IFC: 2,2 For the defaults.
+IFC=? Reports the supported range of parameter values
Response: +IFC: (<modem_by_DTE> range),(<DTE_by_modem> range)
Example: +IFC: (0-3),(0-2).
Command: +ILRR DTE-Modem Local Rate Reporting
Description: This extended-format numeric parameter controls whether or not the
extended-format +ILRR:<rate> information text is transmitted from the
modem to the DTE.
Default: 0
Defined Values: +ILRR0 Disables reporting of local port rate (+ILRR: is not transmitted).
+ILRR1 Enables reporting of local port rate (+ILRR: is transmitted).
Report Commands: +ILRR? Reports current value
+ILRR=? Reports supported range of parameter values
Reported Rate: The <rate> reported represents the current (negotiated or renegotiated)
DTE-modem rate. If enabled, the intermediate result code is transmitted
after any modulation, error control or data compression reports are
transmitted, and before any final result code (e.g., CONNECT) is
transmitted. The <rate> is applied after the final result code is transmitted.
The DTE-modem port rate will change only if neither buffered mode nor
error controlled means are enabled (+ES=x,0) and if the negotiated carrier
rate (+MRR) does not match the current DTE-modem port rate
(autodetected from the previous command line).