Asynchronous / Synchronous Mode Selection - Motorola V.3400 User Manual

Asynchronous / Synchronous Mode Selection &M
The &M commands select synchronous or asynchronous operation and
synchronous dial method.
The &M command selects asynchronous data mode.
The &M1 command selects synchronous data mode 1. Calls are placed
asynchronously. Operation switches to synchronous after connecting
with the remote modem.
The &M2 command selects synchronous data mode 2. The modem
automatically dials a stored number when it detects a DTR off-to-on
transition. DTR must be programmed to be active by the &D
commands.
The &M3 command selects synchronous data mode 3. Calls are placed
manually.
The &M4 command selects synchronous data mode 4 with V.25 bis
autodialer set for Bisync protocol.
The &M5 command selects synchronous data mode 5 with V.25 bis
autodialer set for SDLC protocol.
The &M6 command selects synchronous data mode 6 with V.25 bis
autodialer set for asynchronous.
Use register S30 to select NRZ/NRZI for data format if using SDLC.
Command
&M
&M1
&M2
&M3
&M4
&M5
&M6
* default
Async mode (V.25 bis disabled) *
Sync mode 1 (AT commands if enabled)
Sync mode 2 (DTR dials if active)
Sync mode 3 (manual calls)
Sync mode 4 with V.25 bis bisync
Sync mode 5 with V.25 bis SDLC
Sync mode 6 with V.25 bis async
Operation
V.3400
AT Commands
5-25