Operating Manual

IRS31Pro-UMB Operating Manual V10 / 01.2020
G. Lufft Mess- und Regeltechnik GmbH 23
9 Connections
9.1 Supply Cable
See section 7.3 Connecting the Supply Cable
9.1.1.1 Power Supply
The IRS31Pro-UMB is supplied by a voltage of 12 VDC. The power supply unit used must be approved to
operate devices of protection class III (SELV).
9.1.1.2 RS485 Interface or SDI12
The device has a half-duplex 2 wire RS485 interface with the following settings:
Data bits:.......... 8
Stop bit............. 1
Parity ................ None
Adjustable baud rates: 1200, 2400, 9600, 19200*, 38400
*=factory setting and baud rate for firmware update
This interface can be switched to SDI12 via the sensor configuration.
The screening of the supply cable MUST be laid to earth in the control cabinet.
If the equipment is not connected correctly
 It may not function
 It may be permanently damaged
 There may be a possibility of an electrical shock
9.1.2 Connections in the Housing
There are two 4-pin connectors on the underside of the plastic insert. These are used to connect the
supply voltage and the interface to the associated cable, as well as the optional connection of external
temperature sensors.
Pin assignment supply voltage / RS485 (uncoded):
1 ....... white ........ negative supply voltage
2 ....... brown ....... positive supply voltage
3 ....... green ....... RS485_A
4 ....... yellow ...... RS485_B