Paradyne 3800 - Manual (Page 54)

4. AT Command Set and S-Registers
4-19 3830-A2-GB91-20 November 1996
Table 4-2
(13 of 22)
Model 3830 AT Commands
&R n

RTS Action Request-to-Send (RTS) is a signal from the DTE to
the modem indicating the DTE has data to send to the modem.
&R0 Standard RS232. DTE controls RTS to the modem in normal
EIA-232-D operation. RTS must be ON for the DTE to transmit to the
modem.
&R1 Ignores RTS. Modem assumes RTS is always ON. Use this
selection when the DTE does not provide RTS to the modem.
&R2 Simulated Control Carrier. RTS input controls the remote modem’s
LSD signal. This is used for DTEs that require Line Signal Detect (LSD) to
toggle ON and Off to simulate half-duplex operation.
&R3 Control Carrier. Not valid for Model 3830 operation.