ZMC304X/306X Hardware Manual Version1.3
8
2.2.2 Communication Interface
PIN
Name
Description
1
485B
485-
2
485A
485+
3
EGND
Power source
4
CANL
CAN differential data+
5
CANH
CAN differential data-
6
EGND
Power source
7
422TX-
422 send-
8
422TX+
422 send+
9
422RX-
422 receive-
10
422RX+
422
When multi controller are linked on CAN bus, it is necessary to connect 120 Ω
resistor between CANL and CANH of the last IO expansion module.
Communication interfaces on ZMC3XX series controllers usually use external
24V power. Be careful when linking with other controllers or touch screen.
CAN bus communication two sides should connect with relative GND, or
controller and ZIO expansion module use the same power. When ZMC306X
controller and expansion module use different power, controller power EGND
links to ZIO expansion module power GND, or CAN will be burned out.
