Western Telematic RMM-288 Enables ITU-T V.21 modulation at 300 bps, Modem answers both overseas

RMM Rack Mount Modem; User's Guide

S18	0	Test timer for &Tn loopback testing. Sets the length of time (in
		seconds) the modem will wait before automatically timing out and
		terminating the test. When set to 0, the timer is disabled. Valid range
		is 1 - 255.
S19	0	Sets the duration (in minutes) for the Inactivity Timer. The timer
		activates when there is no data activity on the phone line. At time out,
		the modem hangs up. S19 = 0 disables the timer.
S20	0	Reserved
S21	10	Sets the length (in 10 millisecond units) of Breaks sent from the
		modem to the computer. Applies to MNP or V.42 mode only.
S22	17	Stores the ASCII decimal code for the XON character.
S23	19	Stores the ASCII decimal code for the XOFF character.
S24	0	Reserved
S25	5	Sets the duration (in hundredths of a second) that DTR must be
		dropped in order to be interpreted as a DTR loss. Allows the modem
		to differentiate between a random glitch and a true DTR loss.

In most cases, the default value can be used. The S25 register is useful for setting compatibility with older systems running under older operating software.

S26	0	Reserved
S27	0	Bit mapped register setup. To set the register, see the instructions for
		S13.

Bit	Value	Result
0	1	Enables ITU-T V.21 modulation at 300 bps
		for overseas calls; in V.21 mode, the
		modem answers both overseas and
		domestic (U.S. And Canada) calls, but only
		originates V.21 calls (Default Bell 103).
1	2	Enables un-encoded (non-trellis coded)
		modulation in V.32 mode.
2	4	Disables V.32 modulation.
3	8	Disables 2100 Hz answer tone to allow two
		V.42 modems to connect more quickly.
4	16	Enables V.23 fallback mode.
5	32	Disables V.32bis mode.
6	64	Reserved

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