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AT Commands
Serial Port Ring Indicator (Pin 22) \R
The \R commands determines how the ring indicate signal operates on
pin 22 of the EIA-232 DTE connector.
Command
\R
\R1
* default
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.
Command
&R
&R1
&R2
&R9
* default
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.
5-20
Causes ring indicate signal on pin 22 to turn on (high)
during each ring and remain on during the call
Causes ring indicate signal on pin 22 to turn on (high)
during each ring and turn off (low) when the call is
answered *
Enables RTS to CTS delay
CTS forced on*
CTS follows DCD
CTS equals RTS
Operation
Operation
V.3400
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