AT Command Set and S-Registers
4-23
Issue 2 May 1995
Table 4-2. S-Register Reference (4 of 5)
S-Register
Description
S76=
n
AUTORATE CONTROL
This S-Register determines if the modem is allowed to
automatically adjust its data rate in response to changes in
the line signal quality.
For more information, refer to the B and %B commands,
S-Register S78, and Appendix E,
Advanced Modem
Concepts.
0 = Enables autorating.
1 = Disable autorating.
2 = Enables autorating, starting at 4800 bps.
(Available in Model 3766 only.)
3 = Enables autorating, starting at 9600 bps.
(Available in Model 3766 only.)
S78=
n
AUTOMODE CONTROL
This S-Register determines whether or not your modem
uses automoding. Automoding allows the modem to
automatically detect the remote modem’s modulation when
establishing a connection.
Automoding is highly recommended for most applications.
The following modulations can be detected when
automoding is enabled:
V.34, V.32bis, V.32, V.22bis, V.22, Bell 212A, and Bell 103J.
The highest rated modulation at which the modems will
connect is determined by the setting of the %B command.
If automoding is disabled, and the remote modem does not
agree to use the modulation set by the %B command, the
modems will not connect.
Automoding also allows the modem to connect at a lower
rate if necessary, even if the Autorate feature is disabled
(S76=1). Once the connection is established, however,
further rate changes are allowed only if the Autorate feature
is enabled (S76
1).
For more information, refer to the %B command on
page 4-18, S-Register S76 on page 4-23, and Appendix E,
Advanced Modem Concepts.
0 = Enables automoding.
1 = Disables automoding.
