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Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 105
Command: +IFC DTE-Modem Local Flow Control
Values: 0, 1
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 local flow control applied.
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.
Reporting Current or Selected Values
Command: +IFC?
Reporting Supported Range of Parameter Values
Command: +IFC=?
Command:
+ILRR DTE-Modem Local Rate Control (Not available in V.22bis)
Values: 0, 1
Default: 0
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.
+ILRR0 Disables reporting of local port rate (+ILRR: is not transmitted).
+ILRR1 Enables reporting of local port rate (+ILRR: is transmitted).
Reporting Current or Selected Values
Command: +ILRR?
Reporting Supported Range of Parameter Values
Command: +ILRR=?
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 (auto-detected from the previous command line).
Defined Values:
<rate> Decimal value representing the current (negotiated or renegotiated) DTE-modem
rate: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400
<rx_rate> Optional decimal value reporting the RXD rate, if it is different from the TXD rate: 0,
300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400
Command:
+IPR Fixed DTE Rate (Not available in V.22bis)
Values: n/a
Description:
This numeric extended-format parameter specifies the data rate at which the modem will
accept commands during online operation. It may be used to select operation at rates at
which the modem is not capable of automatically detecting the data rate being used by the
DTE. Specifying a value of 0 disables the function and allows operation only at rates
automatically detectable by the modem. The specified rate takes effect following the
issuance of any result code(s) associated with the current command line.
The
<rate> specified does not apply in Online Data State if Normal Mode (Direct Mode) of
operation is selected.
Defined Values:
<rate>
Specifies the DTE-modem interface operation rate in bits/s. The available rates
are: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400
If unspecified or set to 0, automatic detection is selected and the character
format is also forced to auto-detect, +ICF=0.
If the rate specified is not supported by the modem, an ERROR result code will
be returned.
Reporting Current or Selected Values
Command: +IPR?
Reporting Supported Range of Parameter Values
Command: +IPR=?