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COMSPHERE 3800 Series Modems – Model 3830
4-18 August 1998 3830-A2-GB91-30
Table 4-2
(12 of 23)
Model 3830 AT Commands
&Mn or &Qn Async/Sync Mode and DTE Dialer Type
Sets the modem for either asynchronous or synchronous operation and
selects the type of dialing method the modem uses.
&M0, &Q0 Modem operates in Asynchronous data mode and uses AT
Command protocol.
&M1, &M3, &Q1, &Q3 Modem operates in Synchronous data mode and
uses AT Command protocol.
&M2, &Q2 Modem operates in Synchronous data mode and dials the
telephone number stored in directory location 1 when the DTR signal
turns Off and then ON.
&Q4 Modem operates in Asynchronous data mode with AT commands
and Hayes AutoSync enabled. (NOTE: There is no &M4 command.)
&M231, &Q231 Modem operates in Asynchronous data mode and
disables any type of AT command dialing protocol.
&M232, &Q232 Modem operates in Asynchronous data mode and uses
V.25bis asynchronous dialing.
&M233, &Q233 Modem operates in Synchronous data mode and uses
V.25bis bisynchronous dialing.
&M234, &Q234 Modem operates in Synchronous data mode and uses
V.25bis HDLC dialing.
&M235, &Q235 Modem operates in Asynchronous data mode and
enables a subset of the AT&T command set. This is required for AT&T
DATAKIT dial-out applications.
The &M2, &M231 through &M235, &Q2, and Q231 through Q235
commands disable the use of AT commands and force the modem into
Dumb mode. The only way to regain control of the modem is to recover
AT Commands as described in the
Recovering AT Commands
section in
Chapter 2.