COTRUST CTH200 Series - Definition of Communication Port

CTH200 Series PLC User Manual
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Figure 4-14 CTH2 218-3BX33-0X60 relay output
4.2.3 Definition of Communication Port
CTH200 series PLC, with RS485 interface and standard Ethernet port, supports both serial and
Ethernet communication, definition of these two port shows as below:
Table 4-2-12 Definition of standard RS485 communication port
Connector
Pin Number
Port 0
Port 1
1
6
5
9
1
Shell ground
Shell ground
2
+24V Return
+24V Return
3
RS485 signal B
RS485 signal B
4
RTS (TTL)
RTS (TTL)
5
+5V Return
+5V Return
6
+5V, 100Ω
+5V, 100Ω
7
+24V
+24V
8
RS485 signal A
RS485 signal A
9
NC
NC
Connector shell
Shell ground
Shell ground
Table 4-2-13 4-pin RS485 Communication port (only for CPU H228XL)
Connector
Pin Number
Signal
Definition
1
0V
Logic common
2
A
RS485 signal A
3
B
RS485 signal B
4
T
Terminal resistor,
connect with pin2