Theodor Friedrichs COMBILOG 1020, Hardware Manual

Page: 146 / 170

Hardware Manual COMBILOG 1020
146
11.11 Modem Connection
In case of using a telephone or GSM modem with the
COMBILOG the modem must at first be initialized by means of a
terminal program. Set the interface settings of the terminal pro-
gram to 19200 bps, no parity, and enter the following AT com-
mands. Refer to your modem manual for a detailed description of
the commands, because some commands may differ depending
on the modem type.
Load default settings AT&F
Set baudrate to 19200 bps device dependend
Set auto answer on
*
ATS0=1
Set DSR on AT&C0
Ignore DTR AT&D0
Save configuration AT&W0
* In case the modem is connected to the RS232 port of the Com-
bilog, the datalogger will response the incoming call after 4 rings
automatically. Note, that the ring will not be recognised at the
RS485 port.
Set the RS232 interface of the COMBILOG to 19200 bps, no parity.
Prepare a cable between modem and COMBILOG as shown:
COMBILOG 1020 MODEM
25-pin 9-pin
TX 2 3 RxD
RX 3 2 TxD
GND 7 5 GND
4 7 RTS
5 8 CTS
6 6 DSR
20 4 DTR