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AT Commands
Modem 3600 5-21
Serial Port Ring Indicator (Pin 22) \R
The \R commands determine how the ring indicate signal operates on
pin 22 of the EIA-232 DTE connector.
Request to Send / Clear to Send &R
When the modem is operating in nonbuffered mode (direct mode) or in
synchronous mode, &R enables the RTS-to-CTS delay determined by
the value in S26. &R1 forces CTS high and the modem ignores RTS
(default). With &R2 selected, CTS goes high when carrier is detected.
&R9 forces CTS to follow the state of RTS without delay.
Note
RTS/CTS delay is not valid in buffered mode or with error
control enabled.
Note
With &R2 selected, XON/XOFF is the only valid method of
flow control and &C and &C1 are the only valid carrier detect
options.
Command Operation
\R Causes ring indicate signal on pin 22 to turn on
(high) during each ring and remain on during the
call
\R1 Causes ring indicate signal on pin 22 to turn on
(high) during each ring and turn off (low) when the
call is answered
Command Operation
&R Enables RTS-to-CTS delay
&R1 CTS forced on
&R2 CTS follows DCD
&R9 CTS equals RTS