Western Telematic RMM-288 - Manual (Page 17)

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
RMM Rack Mount Modem; User's Guide
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