D<Value>-Data Terminal Ready (Dtr) Control; F<Value>-Restore Factory Default Configuration - US Robotics 56 K SOFTMODEM - COMMAND REFERENCE REV 1 Command Reference Manual

Command
&C0 Modem ignores the state of the carrier from the remote modem. DCD remains on at all times.
&C1 Modem turns on DCD when the remote modem's carrier signal is detected and turns off DCD
when the carrier signal is not detected (default).
&D<value>—Data Terminal Ready (DTR) Control
Command
&D0
The 56K Softmodem ignores the true status of DTR and treats it as always on. Use this
selection only if the computer does not provide DTR to the modem.
&D1 If the DTR signal is not detected while in on-line data mode, the modem enters command
mode, issues the OK result code, and remains connected.
&D2 If the DTR signal is not detected while in on-line data mode, the modem disconnects
(default).
&D3* Reset modem on the on-to-off DTR transition.
Note:ITU-T Recommendation V.250 (05/99) standardized this command. However, the standard does not
include the additional functionality added with the D3 command.
&F<value>—Restore Factory Default Configuration
Result codes:
Table 3-22: &C<value> Commands
Use this command to set how the 56K Softmodem responds to the DTR signal.
Result codes:
OK if <value> = 0—3.
ERROR if <value> does not equal 0—3.
Table 3-23: &D<value> Commands
Use this command to reset the modem to the configuration programmed at the
factory. This operation replaces all of the command options* and S-register
settings in the active configuration with factory default values.
OK if <value> = 0.
ERROR if <value> does not equal 0.
Function
Function
56K Softmodem
Command Reference
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