User guide

Installing the 1785KA5
Communication Adapter Module
Chapter 2
2-17
Use the following table to determine if the installation was
successful:
If the installation was Then
successful -only the green LEDs flash on and of f.
-the DIP switches are read. All DIP switches are read at this
time only. Changes you make after this time are ignored.
Important: Always power down the module before you change
DIP switch settings.
unsuccessful -the red LED remains on and the green LEDs freeze at the
failed value
-the 1785KA5 is removed from both the DH+ and DH485
networks. Originating devices can not send packets through
the module and do not receive responses.
Use the module’s LEDs and the following table to interpret an
installation failure:
DH+TX DH+RX DH485TX Problem
off off on bad ROM checksum
off on off RAM address test failed
off on on RAM pattern test failed
on off off CTC timer tests failed
Important: If only the red FAULT LED lights up, there are two possible
causes:
a duplicate station address was detected on the DH+ or DH485
the KA5P is indicating that there is a problem with the external
power supply or cable