AT Command Set and S-Registers
13-73980-A2-GB30-20 November 1996
Table 13-1
(5 of 11)
3800
Plus
AT Commands
AT Command Front Panel BranchDescription
&C
n
LSD Control
&C0 Forced On. LSD on at all times.
&C1 Standard RS232. LSD is on when the remote modem’s carrier
signal is detected. LSD is off when carrier signal is not detected.
&C2 Wink When Disconnect. LSD normally forced ON, turns Off for
approximately one second upon disconnecting.
&C3 Follows DTR. State of LSD follows state of DTR.
&C4 Simulated Control Carrier. State of LSD follows state of remote
modem’s RTS.
&C5 =DTR/Disconnect Off. State of LSD follows state of DTR except
upon a disconnect where DTR remains ON and LSD turns Off. DTR
must then toggle Off and ON to turn LSD ON. Use this setting for
AT&T DATAKITr applications. Note that to use this configuration
option, the DTR Action configuration option must be set to
Stndrd_RS232 (&D1 or &D2).
&C6 Bridge Retrain. LSD behaves as if it were set for Stndrd_RS232,
except that it is turned off when a retrain condition lasts longer than
10 seconds, and turned on again when no retrain condition is
detected for a period of 10 seconds.
Configure\Edit\
DTE Interface
&D
n
DTR Action
&D0 Ignore. Modem ignores the true status of DTR and treats it as
always ON.
&D1 Off=Command Mode. Modem enters online Command Mode if
connected when DTR switches Off.
&D2 Standard RS232. DTR Signal is controlled by the DTE.
&D3 Off=Reload Strap. Follows Standard RS232 operation, except that
when DTR switches Off, the modem loads the Active (Saved) area
into the Active (Operating) area.
&D4 Controls On-Hook. Follows Standard RS232 operation, except that
modem does not disconnect until DTR is lowered by the DTE.
Configure\Edit\
DTE Interface
