Chapter 4: PLC Communications
PLC Communication Ports Specifications (continued)
Com Port 1
Com Port 2
Com Port 1 Specifications
Use: Programming and Ethernet Communication
Physical: 8 pin, RJ45, Ethernet
Communication Speed (Mbps): 10/100
Protocol: Modbus TCP (client/server), EtherNet/IP
Implicit and Explicit (adapter server)
Com Port 2 Specifications
Use: Serial Communication
Physical: 6 pin, RJ12, RS-232
Communication speed (baud): 2400, 4800,
9600, 19200, 38400, 57600, 115200
Parity: odd, even, none
Station Address: 1 to 247
Data length: 8 bits (Modbus RTU) or 7, 8
bits (ASCII)
Stop bit: 1,2
Protocol: Modbus RTU
(master/slave) or ASCII in/out
Com Port 3 Specifications
Use: Serial Communication
Physical: 3 pin, RS-485
Communication speed (baud): 2400, 4800,
9600, 19200, 38400, 57600, 115200
Parity: odd, even, none
Station Address: 1 to 247
Data length: 8 bits (Modbus RTU) or 7, 8
bits ( ASCII)
Stop bit: 1,2
Protocol: Modbus RTU
(master/slave) or ASCII in/out
4–4
CLICK PLC Hardware User Manual, 6th Edition, Rev. F – C0-USER-M
Ethernet Basic PLC
Default
-
6 pin RJ12 Phone
-
38400
Odd
1
8 bits
1
Modbus
RTU
Default
-
-
38400
Odd
1
8 bits
1
Modbus
RTU
Com Port 1
Com Port 2
Com Port 3
Port 1
8 pin RJ45 Phone
1 TX+
Type Jack
2 TX-
3 RX+
4 NC
5 NC
6 RX-
7 NC
8 NC
Port 2
1 0V
Type Jack
2 5V
3 RXD Receive data (RS-232)
4 TXD
5 RTS
6 0V
Port 3
3 Pin
1
Terminal Block
2
3
Ethernet Standard and Analog PLCs
Port 1 Pin Descriptions
Transmit Data (+)
Transmit Data (-)
Receive Data (+)
Not connected
Not connected
Receive Data (-)
Not connected
Not connected
Port 2 Pin Descriptions
Power (-) connection (GND)
Power (+) connection
Transmit data (RS-232)
Request to send
Power (-) connection (GND)
Port 3 Pin Descriptions
+ (plus) Signal A (RS-485)
– (minus) Signal B (RS-485)
LG
Logic Ground(0 V)
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