Interface Connector; Switching On The Digital Indicator - WIKA DI35-M Betriebsanleitung

5. Commissioning

5.4 Interface connector

RS-232
The RS-232 interface cables must be connected 1:1 (TxD to TxD and RxD to RxD).
EN
PC or
PLC
RS-485
The RS-485 interface is connected via a shielded data cable with twisted pairs. At
each end of the bus segment, a termination of the bus lines must be connected. This is
needed in order to ensure safe data transfer over the bus. For this, a resistor (120 Ω) is
inserted between data B (+) and data A (-).
DATA B (+)
PC or PLC
DATA A (―)

5.5 Switching on the digital indicator

▶ Connect the power supply.
⇒
Segment test is carried out. Check the correct operation of all LEDs
⇒
Software type and software version are displayed.
⇒
Digital indicator is ready for operation.
16
Where interfaces are not galvanically isolated, the potential reference
between the interface and the measuring input can lead to a compen-
sating current. This compensating current can influence the measuring
signals.
WIKA operating instructions digital indicator, model DI35-M
DI35
DI35