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APPENDIX
Appendix 7.2.4 CS (CTS) control enabled
(BASIC program)
ZOPEN • • • •
ZSEND • • • •
App - 33
The data transmission from the BASIC program is controlled depending on whether
the CS (CTS) control signal is ON or OFF at the target interface on the communication
side.
When the CS (CTS) control signal is ON, the data transmission starts or continues.
When the CS (CTS) control signal turns OFF, the data transmission stops. When the
data transmission stops due to the CS (CTS) control signal being turned off, the
remaining data will continue to be sent when the CS (CTS) control signal turns ON
again later.
A
D51H
Channel open
Send buffer
Waiting to send
Transmission result
The DR (DSR) control has the same control function as the CS (CTS) control.
Determine which of the control functions of the communication module to use depending
on the external device's specifications.
Communication module
CS control
(OS)
signal
Data
CS control
signal
CS control
signal
Data
MELSEC-Q
External device
ON
OFF
ON
App - 33
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