User's Manual
V34bis Fax-modem - AJ 2885 P
AJ 2885 P - Page 30
The status page 3 details all information on DTE and modem speeds, data format, parity,
synchronous or asynchronous mode (answer to the AT&S3 command).
5.4.
Asynchronous or synchronous mode :
The AJ 2885 distinguishes the command and the connection modes :
The command mode is defined by the AT @V command : asynchronous AT (@V1),
asynchronous V25 Bis (@V2), V25Bis HDLC (@V3), V25 Bis BSC (@V4) or disabled
(@V0).
The connection mode is defined by the AT &M command : asynchronous (&M0) or
synchronous (&M1).
5.5.
Configuration of the asynchronous mode :
The following features apply on asynchronous connection mode.
5.5.1. Error correction and data compression:
T
he modem is set in default factory configuration in automatic mode so that it can negotiate the
best protocol with the remote modem.
A flow control should be configured in asynchronous mode to avoid loss of received data.
The following commands apply :
Command Function
*M0
*M1
*M2
*M3
direct mode, no protocol. The modem is
transparent to the transferred data. No
flow control is possible. The XON.XOFF
flow control is passed over the line.
Normal, no protocol. The modem buffers
transferred data. Flow control can be
RTS-CTS or XON XOFF.
Automatic. The modem tries to negotiate V42
or MNP modes
Exclusive. The modem only accepts
connection in the configured protocol.
*T
Protocol type : MNP (*T1), V42 (*T2),
automatic (*T3).
*G
Error alarm : the internal high speaker may
beep when it detects an errored packet in the
received data flow (*G0
: disable, *G1
:
enable).
&M0
Selects the asynchronous connection mode.