2 Basic System Configuration and Devices
2-28
CJ2 CPU Unit Hardware User’s Manual
The host computer or a Programming Device, such as the CX-Programmer, is connected via the serial
port on the CPU Unit or, with the CJ2M-CPU3@, on the Serial Option Board. In addition, up to 15 Serial
Communications Units can be connected to a single CPU Unit, making it possible to configure a flexible
serial communications system by connecting devices with RS-232C or RS-422/485 ports (such as
PLCs from other manufacturers, temperature controllers, bar code readers, ID systems, personal com-
puters, board computers, and components).
For details on the protocol modes that can be selected for each port, refer to 11-2-1 Overview of Serial
Communications in the CJ2 CPU Unit Software User’s Manual (Cat. No. W473).
Additional Information
Use the Peripheral Bus to connect the CJ2 CPU Unit to the CX-Programmer via serial communi-
cations.
System Configuration Example
RS-232C
RS-232C
PT
CX-Programmer
or host
computer
NT Link
CPU Unit
Peripheral Bus
(Toolbus)
Host Link slave
Serial
Communications Units
Protocol macro
No protocol
Device supporting
CompoWay/F
Device supporting
Modbus
CPU Unit
Host Link slave
General-purpose external device (e.g., such as a
PLC from other manufacturer, temperature
controller, or bar code reader)
: Protocol
*4
CJ2M, CJ1M, CP1H,
CP1L, or CP1E CPU Unit
Serial PLC Link
CompoWay/F master
Modbus master
Host Link master
*4
*4
*1
*2
*3
*1 Serial port (RS-232C): A serial port is built into only the
CJ2H CPU Units and the CJ2M-CPU1
@
CPU Units.
*2 Serial Option Board: A Serial Option Board can be
mounted only to a CJ2M-CPU3
@
CPU Unit.
*3 Serial PLC Links are supported only by CJ2M CPU
Units.
*4 This is connected using the Serial Gateway. The Serial
Gateway is supported for Serial Communications Units
with unit version 1.2 or later.
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