Communication Wiring - Protech Systems SI-W509 User Manual

3.2.3 Communication Wiring

We recommend using shield-twisted-pair cable on SI-W509 I/O Module. And
the cable has to comply with the EIA RS-485 standard. Only one set of twisted
pair cable is required for transmitting data. For more stable power isolation, we
recommend connecting GND.ISO pin to the Ground pin of the host.
We suggest the following standard colors for each data line:
(Y)DATA+
(G)DATA-
GND.ISO
SI-W509 SERIES USER MANUAL
1
Yellow
Green
Black (Optional)
Chapter 3 Hardware Configuration
5
GND (Optional)
Data-
Data+
Host RS-485
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