Wiring - Device Connection; Supply Voltage; Connection - Serial Devices; Terminal - Apparatus With Rs485 Interface And Modbus Rtu - Lambrecht Ser[LOG] Operator's Manual

2

Wiring - Device Connection

2.1

Supply voltage

Via terminal "VIN", the Ser[LOG] can be supplied with 10 ... 30 VDC. The connection is protected
against reverse polarity. The used DC / DC converter is not isolated. Typically, the Ser[LOG] is sup-
plied with 12VDC or 24VDC.
Note: The applied supply voltage is routed through the "Ser[LOG] bus" to the connected AnDiMod
measurement modules. The modules pass this voltage on to supply sensors. This means that the
sensor supply terminals always receive the same voltage that was applied on Ser[LOG]. VOUT = VIN
2.2

Connection - Serial devices

The following devices with serial interface can be connected to the Ser[LOG]:
•
Sensors
•
Evaluation PC
•
Modem
•
Modbus relay
•
AnDiMod (COM6)
Important note: By default factory settings the serial ports are disabled. The Ser[LOG] can be
reached during initial commissioning only via the mini-USB service interface or a (suitable) Bluetooth
stick.
2.2.1

Terminal - apparatus with RS485 interface and Modbus RTU

By default factory settings the equipment with RS485 interface (e.g. Modbus RTU protocol) can be via
the COM port 2-6 connected. The device is delivered so the RS485 hardware drivers for COM ports
are enabled through the jumper fields from 2 to 6.
RS485 jumper settings for COM2...6
Example of lower jumper field: RS485 hardware driver for COM2 to COM6 activated.
Note: In order to use the occupied COM interfaces, they must be switched on and configured with the
Ser[LOG]-Commander.
LAMBRECHT meteo GmbH
COM2...4
RS485
Device
Data+
Data-
Ser[LOG] Manual
TxD
RxD
GND
RS485
T+
Device
T-
R+/D+
Data+
R-/D-
Data-
COM5...6
T+
T-
R+/D+
R-/D-
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