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W&T
3.2 RS232 interface
The pin assignments for the RS232 port are identical with that
of a dialup modem, which means that standard cable can be
used. Make sure that the ports for the LAN-Modem and the
serial terminal device are configured for identical transmission
parameters and handshake procedures.
The following table shows the factory configured functions for
the individual signals. These can be modified using the
respective AT commands.
Pin
Direction
Factory setting
1
Output
Active for existing connection
2
Output
Data output
3
Input
Data input
4
Input
If deactive, break connection and do not
accept new connection until active again
5
GND
---
6
Output
Always active
7
Input
Hardware handshake input
Data output only when active
8
Output
Hardware handshake output
active = ready to receive data
deactive = not ready to receive data
9
Output
For incoming connection alternately 1s
active, 4s deactive until connection is
established; then deactive
26
Interfaces and Displays
AT command
AT&Cn
---
---
AT&Dn
AT&Sn
AT&Kn
AT&Kn
---
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