APPENDICES
Appendix 6 Precautions for Using Serial Communication Module
Appendix 6.1 CSET Instruction
App
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(2) When clearing receive data without stopping the send processing in
nonprocedural protocol
The following shows the device and buffer memory used in the sample program of
clearing receive data.
(a) Device of programmable controller CPU
(b) I/O signal
(c) Buffer memory
When all of the receive processing, send processing, and receive data clear
processing are not executed, write 1 to the following address.
POINT
1. When using the Q series C24 (function version A), restart the data
communication when 100ms has passed after the buffer memory address
A8H (for CH1)/148H (for CH2) was changed from 1 to 0.
2. Do not execute clear request of receive data during communicating data with
the external device, since data communication is discontinued when clear
request is performed to the receive data.
Table.App 18 Device Used in the Program
Device No.
Application
Remarks
X23
Receive data clear request command ON: Receive data clear request
M11
Receive processing
ON: Executing, OFF: Not executed
M12
Send processing
ON: Executing, OFF: Not executed
M15
Receive data clear request pulse
ON: Receive data clear request
M16
Receive data clear request
acceptance flag
ON: Receive data clear request
acceptance
M17
Receive data clear request completion
flag
ON: Receive data clear request
completion
M18
Communication disable
ON: Communication disable
M19
Communication enable
ON: Communication enable
Table.App 19 List of I/O Signal
I/O signal
Signal name
Description
CH1 side
CH2 side
Xn3
XnA
Reception data read request
ON: Requesting read
Xn4
XnB
Reception abnormal detection
ON: Abnormal detection
Yn1
Yn8
Reception data read completion
ON: Data read completed
Table.App 20 List of Buffer Memory
Buffer memory address Hexadecimal (decimal)
Buffer memory name
CH1 side
CH2 side
A8
H
(168)
148
H
(328)
Receive data clear request
