Case Communications syncro 1496, Reference Manual

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The factory default (off) complies with the ITU-T recommendation.
/O0 allows DSR to be turned on where your DTE needs it to
transmit or receive characters.
/P Echo Protect Tone
This command only applies to V.33 and V.29 operation.
/P0 Disabled. Default.
/P1 Response codes are not sent.
/P2
Response codes are not sent in answer mode and
are sent in originating mode.
This tone precedes the training sequence of the modem and is
primarily used in half duplex modes over long distance and
international circuits.
''P Poor Quality Threshold
This command sets the poor quality threshold for use by the signal
quality monitor. It indicates the point at which a fallback to a
lower transmission speed will take place.
''Pn where n is the threshold value (0-15) in S-register S28.
Q
Quiet Mode
This command determines whether response codes are sent to the
command port when commands are executed. The full response
code table is given with the
X command.
Q0 Response codes are sent. Default.
Q1
Response codes are not sent.
Q2 Response codes are not sent in answer mode and
are sent in originating mode.
Q2 is useful when a DTE would get confused seeing response codes
in answer mode, but still requires results for dialling or
configuration.
&Q Interaction with DTR Signal
This command determines how the modem interacts with the DTR
(Data Terminal Ready) signal from your DTE. (DTR low means
that the DTE is not ready, high means that the DTE is ready.)
X450-310851 Issue 2 8-17 Rev.1