Thermo Scientific V.22/212A User Manual page 28

AT&Gn The CCITT Guard Tone Command selects one of several guard tones for the modem
used in the CCITT mode (typically not used in the United States). Values for "n" are
defined as follows:
0
1
2
ATJx The Auxiliary Relay Control Command was developed to provide switching of
different telephone line jacks. The hardware of this modem does not support this
operation.
AT&Mn The Asynchronous/Synchronous Mode Command (identical function to AT&Qn)
sets the mode for the on-line operation. The values of "n" are defined as follows:
0
1
2
3
AT&Px The Pulse Dial Mode Command sets the make/break ratio of pulse dialing for
different countries. The 0 value of "x" sets the command for the United States
standard, and 1 for the United Kingdom.
AT&Qn Identical to AT&Mn command.
AT&Rx CTS Control Command controls the CTS signal. If the value of "x" is 0, the CTS
signal tracks the RTS signal. If 1, CTS is always set high.
AT&Sx The DSR Mode Command sets the DSR signal high at all times if the value of "x" is
0. If 1, the DSR is low when in the modem is in the command mode and high during
the on-line mode.
AT&Tn The Test Mode Commands provide diagnostic tests for modem operation. The
various test modes (values of "n") are defined as follows:
0
1
3
4
no guard tone.
1800-Hz guard tone.
550-Hz guard tone.
Asynchronous mode.
Synchronous in the on-line mode.
Synchronous mode after DTR goes low and stored dialing string is dialed.
Synchronous mode when DTR is high.
Terminate test in progress.
Initiates the local analog loopback test, checking the data paths between the
local modem and the computer.
Initiates the local digital loopback test, causing the local modem to transmit
data received from a remote modem back to that remote modem.
Permits the local modem to participate in a remote digital loopback test
initiated from a remote modem (only needed if an AT&To command has
been previously entered).
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