Lambrecht Ser[LOG], Operator'S Manual

Page: 18 / 129

LAMBRECHT meteo GmbH Ser[LOG] Manual Page 18 of 129
2.2.2 Special case - Sensors with RS485 interface in talker mode RS422
Some sensors transmit their readings automatically within a fixed time interval; they are operating in the
so-called talker mode. LAMBRECHT meteo sensors that have an RS485 interface and are operated in
talker mode, can be connected to the Ser[LOG] and to the "R +" and "R" terminal (Read-lines) of a
RS422 configured interface.
RS485
Device
Talker-Mode
RS485
Device
Talker-Mode
COM1
RTS
CTS
TxD
RxD
GND
T+
T-
R+ /D+
R- /D-
RS485
Device
Talker-Mode
Data+
Data-
COM2...4
TxD
RxD
GND
T+
T-
R+ /D+
R- /D-
Data+
Data-
COM5...6
T+
T-
R+ /D+
R- /D-
Data+
Data-
RS422 jumper settings for COM1…6
Example of lower jumper field: RS422 hardware driver for COM2 to COM6 activated. (COM1 always RS422)
Note: In order to use the occupied COM interfaces, they must be switched on and configured with the
Ser[LOG]-Commander.
2.2.3 Connection - devices with RS422 interface
In the default factory settings devices with RS422 interface can be connected to the COM port 1. On
these settings the RS485 hardware drivers are enabled by jumper field for the COM ports 2-6. These
can be switched to RS422 hardware drivers by disconnecting the respective jumpers (see picture
above).
RS422
Device
RS422
Device
COM1
RTS
CTS
TxD
RxD
GND
T+
T-
R+
/D+
R- /D-
RS422
Device
Tx+
Tx-
COM2...4
TxD
RxD
GND
T+
T-
R+
/D+
R- /D-
Tx+
Tx-
COM5...6
T+
T-
R+
/D+
R- /D-
Tx+
Tx-
Rx+
Rx- Rx+
Rx- Rx+
Rx-
Note: In order to use the occupied COM interfaces, they must be switched on and configured with the
Ser[LOG]-Commander.