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COMSPHERE 3800Plus Modems
13-10 November 1996 3980-A2-GB30-20
Table 13-1
(8 of 11)
3800
Plus
AT Commands
AT Command Front Panel BranchDescription
&M
n
and &Q
n
Async/Sync Mode and DTE Dialer Type
&M0, &Q0 Modem operates in Asynchronous mode and uses
AT Command protocol.
&M1, &Q1 Modem operates in Synchronous mode and uses
AT Command protocol.
&M2, &Q2 Modem operates in Synchronous mode and dials telephone
number stored in directory location 1 when DTR signal turns
Off and then ON.
Configure\Edit\
DTE Dialer
&M3, &Q3 Modem operates in Synchronous mode and uses
AT Command protocol.
&M231, &Q231 Modem operates in Asynchronous mode; the DTE Dialer
Type is disabled.
&M232, &Q232 Modem operates in Asynchronous mode; V.25bis Async
dialing is enabled.
&M233, &Q233 Modem operates in Synchronous mode; V.25bis Bisync
dialing is enabled.
&M234, &Q234 Modem operates in Synchronous mode; V.25bis HDLC
dialing is enabled.
&M235, &Q235 Modem operates in Asynchronous mode; AT&T
Exclusive dialing is enabled.
&M236, &Q236 Modem operates in Synchronous mode; the DTE Dialer
Type is disabled.
The &M2, &Q2, &M231, &Q231, &M236, and &Q236 commands disable
the use of AT commands and force the modem into Dumb mode. The only
way to gain control of the modem is the front panel.
&R
n
RTS Action
&R0 Standard RS232. RTS must be ON for the DTE to transmit to the
modem.
&R1
Ignores RTS. Modem acts as if RTS is always ON.
&R2 Simulated Control Carrier. RTS input controls the remote modem’s
LSD signal.
&R3 Control Carrier. The DTE’s RTS signal controls the modem’s carrier
signal.
Configure\Edit\
DTE Interface
&S
n
DSR Control
&S0 Forced On. DSR output is constantly ON.
&S1 Standard RS232. The modem controls DSR to the DTE, turning ON
DSR when handshaking begins, and Off upon disconnect.
&S2 Wink When Disconnect. DSR is normally ON, but is forced Off
momentarily during a disconnect.
&S3 Follows DTR. When the modem receives DTR from the DTE, it
sends DSR to the DTE.
&S4 On Early. DSR is Off when the modem is in an idle state, and goes
ON when a command is received to enter Data mode.
&S5 Delay to Data. Like Standard RS232, but DSR is not turned ON
until the modem is in Data mode.
&S6 Dial Backup Toggle. DSR is turned Off during a dial backup attempt,
and ON when the attempt is completed.
Configure\Edit\
DTE Interface