Rs485: Pin Out - Emerson OPM4001 Installation And Operation Manual

I N S T R U C T I O N M A N U A L

RS485: PIN OUT

Use RS485 to create a multi-drop network containing up to 32 devices.
Note: port #1is set to RS485

Note that the ports are not isolated. If
controller is used with a non-isolated
external device, avoid potential voltage
that exceeds +/- 10V. To avoid damaging
the system, all non-isolating device ports
should relate to the same ground signal.

Use shielded, twisted pair cables.

Minimize the stub (drop) length leading
from each device to the bus.

Ideally, the main cable should be run in and out of the network device.

Do not cross positive (A) and negative (B) signals. Positive terminals must be wired to positive and negative terminals to
negative.
R E V 4 . 2
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