3Com 56K Command Reference Manual page 188

I-6 A I: S-R
PPENDIX EGISTERS
Register Default Function
Bit
1
2
3
6
7
S38 0 Sets the duration, in seconds, before a forced hang-up and
clearing of the Transmit buffer when DTR drops during an
ARQ call. This is provided to allow time for a remote device
to acknowledge receipt of all transmitted data. Default =
0: The Business Modem immediately hangs up when DTR
drops. If the Business Modem receives the ATH command,
it ignores S38 and immediately hangs up.
S41 0 Sets the number of allowable remote-access login attempts,
thus enabling or disabling remote access. The default
setting of zero allows no remote login attempts, thus
disabling remote access. A value of 1 or greater enables
remote access. If the number of unsuccessful login
attempts exceeds the limit set by this register, the Business
Modem returns online and any further login attempts
during the remainder of that connection are refused.
S42 126 Stores the ASCII decimal code for the remote-access escape
character. The default character is a tilde (~).
S43 200 Sets the duration, in fiftieths of a second, of the guard time
for the remote-access (~~~~) sequence.
S51 0 Bit-mapped register. See Chapter 1, Using the AT
Command Set, for instructions about how to set
bit-mapped registers.
Bit
0
1
2
Value Result
2 Disable the Business Modem's
enhanced, proprietary V.32bis
modulation. Used for
troubleshooting.
4 Disable the faster retrains that occur
during proprietary V.32terbo
modulation. Used for
troubleshooting.
8 Enable V.23. Required for some
British connections.
64 Disable the remote-access busy
message.
128 Disable V.32terbo.
Value Result
1 Disable MNP/V.42 for V.22 (1200 bps)
2 Disable MNP/V.42 for V.22bis (2400
bps)
4 Disable MNP/V.42 for
V.32/V.32bis/V.32terbo
(9600/14400/19200/21600 bps).