2 Basic System Configuration and Devices
System Configuration Example
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).
CX-Programmer
or host
computer
Peripheral Bus
(Toolbus)
Host Link slave
*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.
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.
2-28
PT
NT Link
CPU Unit
RS-232C
*1
*2
*3
Serial PLC Link
CJ2M, CJ1M, CP1H,
CP1L, or CP1E CPU Unit
Serial
Communications Units
CompoWay/F master
*4
*4
Modbus master
*4
Host Link master
RS-232C
Protocol macro
No protocol
General-purpose external device (e.g., such as a
PLC from other manufacturer, temperature
controller, or bar code reader)
Device supporting
CompoWay/F
Device supporting
Modbus
CPU Unit
Host Link slave
: Protocol
CJ2 CPU Unit Hardware User's Manual