3Com 3C900B Installation And Operating Instructions Manual page 129

&Pn Sets pulse (rotary) dial
make/break ratio.
&P0 U.S./Canada ratio,
39%/61%
&P1 U.K. ratio, 33%/67%
&Rn Sets Receive Data (RD)
hardware flow control,
Request to Send (RTS) (see
also &Hn).
&R0 Reserved
&R1 Modem ignores RTS
&R2 Received Data to
computer only on RTS
&Sn Controls Data Set Ready
(DSR) operations.
&S0 DSR override; always
ON
&S1 Modem controls DSR
T Q R
ECHNICAL UICK EFERENCE
&Tn Begins test modes (used in
conjunction with s register
18).
&T0 Ends testing
&T1 Analog Loopback
&T2 Reserved
&T3 Local Digital
Loopback
&T4 Enables Remote
Digital Loopback
&T5 Prohibits Remote
Digital Loopback
&T6 Initiates Remote Digital
Loopback
&T7 Remote Digital with
self-test and error
detector
125