User's Manual
V34bis Fax-modem - AJ 2885 P
AJ 2885 P - Page 31
5.5.2. Flow
control:
Through Xon-Xoff : :
AT *LG1
generates a local Xon-Xoff,
AT *LR1
answers to the local Xon-Xoff
These commands are the original AJ commands. For compatibility with standard
general purpose modems the following command may be used : AT &K4
Through RTS-CTS :
AT *LG2
generates a CTS flow control
AT * LR2
answers to the RTS flow control
AT %C1
sets the CTS signal for flow control
AT&R1
sets the RTS signal for flow control
The *LG and %LR commands are the original AJ commands. For compatibility with
standard general purpose modems the following command may be used : AT &K3
5.6.
Configuration of the synchronous mode
AJ2885 modem provides synchronous connection in transparent mode, i.e. the same speed
applies on both DCE and DTE interfaces.
The following parameters should be adjusted for synchronous connections:
Command Function
&M1
Selects the asynchronous connection mode.
*M
0. Direct mode. The modem is transparent to the transferred data.
Transfer delay is the lowest possible.
1.
Normal mode. The modem buffers bytes and re-synchronises bit to
the receive and transmit clock whenever possible.
&X
0.
Internal clocks. The modem generates the clocks on V28 interface
pin 15 (pin 13 and 15 in V11 interface)
1.
External clock. The modem uses the terminal clock provided on V28
interface pin 24 (pin 11 and 24 in V11 interface). This clock must be
well adjusted to the connection mode rate.
2.
Slave clock. The modem synchronises from the received carrier and
provides these clocks on V28 interface pin 17 (pin 12 and 17 in V11
interface).
Note : some synchronous terminals sends permanent data even when the modem are not
connected. To prevent the modem to interpret these data as configuration command, it can be
set in dumb mode by the AT @V0 command, or by the X1 jumper.
(1) The &Xn parameter defines the transmit clock behaviour. A typical modem connection
sets one modem for internal clock and the other one in slave mode.
