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Serial Communications Section 6-3
6-3 Serial Communications
The CS/CJ-series CPU Units support the following serial communications
functions. Host link communications and no-protocol communications are
described in detail later in this section.
Protocol Connections Description Ports
Peripheral RS-232C
Host link
1) Various control commands such
as reading and writing I/O mem-
ory, changing the operating
mode, and force-setting/reset-
ting bits can be executed by
issuing host link commands or
FINS commands from the host
computer to the CPU Unit.
2) It is also possible to issue FINS
commands from the CPU Unit
to the host computer to send
data or information.
Use host link communications to
monitor data such as operating
status, error information, and qual-
ity data in the PLC or send data
such as production planning infor-
mation to the PLC.
OK OK
No-protocol Communicate with standard
devices connected to the RS-232C
port without a command–response
format. Instead the TXD(236) and
RXD(235) instructions are exe-
cuted from the program to transmit
data from the transmission port or
read data in the reception port.
The frame headers and end codes
can be specified.
Not allowed OK
NT link
1:N or 1:1
Data can be exchanged with PTs
without using a communications
program in the CPU Unit.
OK OK
Host computer
or
OMRON PT
(Programmable
Terminal)
OMRON PTs
(Programmable Terminals)
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