Table of Contents
Advertisement
6.9.5 R
S
EQUEST TO
END
When the modem is operating in nonbuffered mode (direct mode), AT&R enables the RTS-to-CTS delay,
determined by the value in S26. AT&R1 forces CTS high, and the modem ignores RTS. With AT&R2
selected, CTS goes high when carrier is detected. AT&R9 forces CTS to follow the state of RTS without
delay.
Command
&R
&R1
&R2
&R3
†default
RTS/CTS delay is not valid in buffered mode or with MNP enabled.
With AT&R2 selected, XON/XOFF is the only valid method of flow control and &C and &C1
are the only valid carrier detect options.
6.9.6 DTE F
ALLBACK
If the DTE fallback (EIA-232, pin 23) input to the modem is not in use, set the option to ignore pin 23.
To cause the modem to act on high/low levels of pin 23, enable this option. Negative level forces higher
rate; positive forces lower rate.
Command
*FB
*FB1
†default
/C
S
(&R)
LEAR TO
END
Table 6-11. Request to Send/Clear to Send (&R).
(P
23) (*FB)
IN
Table 6-12. DTE Fallback (Pin 23) (*FB).
CHAPTER 6: Asynchronous Operating Commands
Description
Enables RTS to CTS delay
CTS forced on†
CTS follows DCD
CTS equals RTS
NOTE
NOTE
Operation
Ignore pin 23†
Transition on pin 23 changes speed
6 9
Advertisement
Table of Contents
