3 Wiring
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3.4 Communication
3.4.1 Functions of Communication Terminals
The COM1 and CAN communication ports of H
3U
need to be connected.
The terminals are pluggable terminals. The denitions of the terminals
are described in the following:
Name Description
+24V,CGND
CAN communication power
supply, setting range is
between 9-30 V
485+
485-
GND
+24V
CAN-H
CAN
-L
CGND
H3U
COM1
CAN communication port
CANL,CANH
CAN communication cable,
the reference level is CGND.
CGNDs must be connected
to each other when there are
multiple stations.
It is the shield layer, which
should be connected
according to the actual need.
485+, 485-
It is used to connect the
RS485 communication signal
cable.
GND
It is for the reference signal
of the RS485 communication
signal.
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