3Com 56K Enable hardware flow control of received data, Modem sends data to the computer only

B-10APPENDIX B: ALPHABETIC COMMAND SUMMARY

Command	Function
	&R2	Enable hardware flow control of received data.
		The modem sends data to the computer only
		upon receipt of the RTS signal.
&Sn	Send the computer a Data Set Ready (DSR) signal via the
	EIA-232 interface. ("Data Set" is industry jargon for modem.)
	&S0	DSR is always ON (override).
	&S1	In Originate mode: Send DSR after dialing, on
		detection of the remote device’s answer tone. In
		Answer mode: Send DSR after sending an answer
		tone.
	&S2	When Carrier is lost, send a pulsed DSR signal
		with Clear to Send (CTS) following Carrier Detect
		(CD). This option is for specialized equipment such
		as automatic callback units.
	&S3	Same as &S2, but without the CTS signal.
	&S4	Send the computer DSR at the same time as CD.
	&S5	Send DSR normally, and follow CTS with CD.
&Tn	Test the modem.
	&T0	End testing.
	&T1	Enter Analog Loopback (AL) mode. Your modem
		will send a CONNECT message. Data is shown on
		your screen.
	&T2	Enter AL mode and send a CONNECT message.
		The Business Modem sends an internal test
		pattern to the transmitter and loops the pattern
		back to the receiver. No data is seen on your
		screen.
	&T3	Start local digital loopback testing.
	&T4	Grant a remote digital loopback test of your
		modem.
	&T5	Deny a remote digital loopback test of your
		modem.
	&T6	Start remote digital loopback testing.
	&T7	Start remote digital loopback with self-test and
		error detection.
&Wn	Write the current settings to NVRAM.
&Yn	Break handling. This command lets you send a break to stop
	data transfer without disconnecting.