Product data

USRobotics
Command Reference
Data Command Set - 33
In &C1 mode of operation, RLSD is not turned off until all data previously received
from the remote modem is delivered to the local DTE. However, such buffered
data will be discarded and RLSD will be turned off if the DTE turns off DTR (if &D1
or &D2 is set).
Syntax
&C[<value>]
Defined Values
<value> Decimal number corresponding to the selected option. 0 RLSD is always
ON. 1 RLSD follows the state of the carrier. (Default.)
Result Code
OK <value> = 0 or 1
ERROR Otherwise.
&D - DTR Behavior
This parameter determines how the modem responds when the Data Terminal
Ready (DTR) input is changed from the ON to the OFF condition during online
data state.
Syntax
&D[<value>]
Defined Values
<value> Decimal number corresponding to the selected option.
0 Modem ignores DTR.
1 Upon an on-to-off transition of DTR, the modem enters online
command state and issues an OK result code; the call remains
connected.
2 Upon an on-to-off transition of DTR, the modem instructs the
underlying modem to perform an orderly cleardown of the call.
The disposition of any data in the modem pending transmission
to the remote modem is controlled by the +ETBM parameter;
otherwise, this data is sent before the call is cleared, unless the
remote modem clears the call first (in which case pending data is
discarded). The modem disconnects from the line. Automatic
answer is disabled while DTR remains off.
Result Code
OK <value> = 0 or 2
ERROR Otherwise.