14-5
14 Serial Communications
CP2E CPU Unit Software User’s Manual(W614)
14-1 Serial Communications
14
14-1-2 Overview of Serial Communications
The CP2E CPU Units support the following types of serial communications.
14-1-2 Overview of Serial Communications
Connected devices Description
Communications
protocol
Built-in
RS-232C/
Serial
Port 1
Built-in
RS-485/
Serial
Port 2
Serial
Port 1
(EX)
Programmable Terminal Data can be exchanged
with PTs without using a
communications program
in the CPU Unit.
Note Only one PT can be
connected when
using a 1:N NT
Link. It is not possi-
ble to connect two
PTs.
Host Link or 1:N
NT Link
OK OK NO
General component Communicates with gen-
eral devices, such as bar-
code readers and
measuring instruments,
with an RS-232C or RS-
422A/485 port without a
command-response for-
mat. The TXD and RXD
instructions are executed
in the ladder program in
the CPU Unit to transmit
data from the transmis-
sion port or read data in
the reception port.
No-protocol
communications
OK OK OK
Modbus-RTU slave devices, such as
inverters
Data can be easily
exchanged with general
devices that support Mod-
bus-RTU slave functional-
ity (such as inverters) and
are equipped with an RS-
232C port or RS-
422A/485 port.
Modbus-RTU Easy
Master Function
OK OK OK
Data links between CPU Units Data links can be created
for up to nine CP-series
or CJ2M CPU Units,
including one Polling Unit
and up to eight Polled
Units. Up to 10 words can
be shared per Unit.
*1
Serial PLC Links
*2
OK OK OK
CP2E
RS-232C
NS-series PT
Host Link or NT Link
CP2E
RS-232C or RS-422A/485
General device with
serial communications
CP2E
RS-232C or RS-422A/485
Inverter
RS-422A/485
CP2E CPU Unit Polling Unit
Shared data
CP2E CPU Unit Polled Unit CP1L CPU Unit Polled Unit
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