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1 Introduction
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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Overview
This section gives an overview of the Serial Communications Unit.
The Serial Communications Units are CJ-series CPU Bus Units. You can mount one or more Units to
an NJ-series CPU Rack or an CJ-series Expansion Rack. You can control a total of up to 16 CPU Bus
Units by one CPU Unit. (Serial Communications Units is abbreviated to Units in some sections of this
manual.)
A Serial Communications Unit has two communications ports to connect with host computers, general-
purpose external devices or support software. The Units allow easy expansion of ports for serial com-
munications.
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Models
CJ1W-SCU22
(Two RS-232C ports)
CJ1W-SCU42
(One RS-232C and One RS-
422A/485 Port)
CJ1W-SCU32
(Two RS-422A/485 ports)
Serial Communications Unit
RS-232C port
RS-232C port
RS-422A/485 port
RS-232C port
RS-422A/485 port
RS-422A/485 port