ZMC408SCAN Hardware Manual Version1.2
7
2.2.1
Power, CAN Interface
PIN
Name
Description
1
E+24V
DC24V power inputs positive pole
2
CANH
CAN data differential cable +
3
FG
Shield layer/safety ground
4
CANL
CAN data differential cable -
5
EGND
DC24V power inputs negative pole
When multi controllers are linked on CAN bus, it is necessary to connect 120 Ω resistor
between CANL and CANH of the last IO expansion module to promote communication
signal quality and increase stability.
2.2.2
RS232, RS485 Communication Interface
PIN
Name
Description
1, 6, 8
NC
Reserved
2
RXD
232 receive signal
3
TXD
232 send signal
4
485A
485 signal A
5
EGND
Communication signal reference ground
7
485B
485 signal B
9
E5V
Power 5V outputs, which can supply power for
text screen, and the max current is 300mA
Crossover cable with two female head is needed when links to computer.
No need to connect terminal resistance with bus when 485 expands.
