14 Serial Communications
14-6
CP2E CPU Unit Software User’s Manual(W614)
*1 A PT cannot be included in the Serial PLC Links.
*2 Serial PLC Links and Modbus-RTU Slave cannot be used on two ports at the same time.
Note The Built-in RS-485 port of S-type CPU Units and the RS-485 port of CP2W-CIFD2/CIFD3 can only communicate in
half duplex.
Additional Information
Refer to A-3 Wiring for Serial Communications in the CP2E CPU Unit Hardware User’s Manual
(Cat.No.W613) for Serial communication wiring.
Connected devices Description
Communications
protocol
Built-in
RS-232C/
Serial
Port 1
Built-in
RS-485/
Serial
Port 2
Serial
Port 1
(EX)
Host computers PLC data can be read by
the host computer or writ-
ten to the PLC from the
computer. The host com-
puter sends a Host Link
command (C Mode) or a
FINS command to the
CPU Unit to read/write
I/O memory, change the
operating mode, or to
force-set/reset bits in the
CPU Unit.
Host Link OK OK NO
Modbus-RTU Master devices Data can be read or writ-
ten to the CP2E by Mod-
bus-RTU master of other
company’s PLCs.
Modbus-RTU
Slave Fuction*
2
OK OK OK
RS-232C
Computer
Host Link
Other company's PLC
Master
RS-485
Modbus-RTU
CP2E
Slave
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