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Serial Communications Instructions
Section 3-24
serial ports on the Serial Communications Board (CS Series only) or Serial
Communications Unit.
Instructions
Communications frames
Function
TXD(236)
and
RXD(235)
Sends or receives data in one direction only.
A send delay can be set.
PMCR(260)
Up to 16 steps can be defined for sending
and receiving.
Steps can be changed and retry processing
performed based on responses.
Communications monitoring times can be
set.
Symbols can be read/written for the PLC.
Repeat symbols can be used.
Other.
Instructions
Mode
Communications ports
TXD(236)
and
RXD(235)
No-protocol
(custom)
PMCR(260)
Protocol macro
Any of the following can be used.
No Start or End Code
Data
Start and End Code
Data
Only Start Code
Data
CR+LF End Code
Data
Only End Code
Start and CR+LF End Code
Data
Data
The following type of frames (messages) can be created
to meet the requirements of the external device.
Header
Address
Data
Error check Terminator
Communications steps
can be created.
Read/write
I/O memory
Serial port built into CPU Unit
CPU Unit
TXD(236)/
RXD(235)
RXD(235)
TXD(236)
TXD(236) and RXD(235)
cannot use serial ports on
Serial Communications
Boards or other Units.
Serial Communications Board
Receive
Send
Serial Commu-
nications Board
(CS Series
only)
Serial Communications Unit
Receive
Send
Serial Communications Unit
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...