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APPENDIX
Appendix 7.1.2 DC1/DC3 reception control enabled
(BASIC program)
ZOPEN • • • •
ZSEND • • • •
1 When the communication channel is opened, the status of the send buffer is the same as when a DC1
control signal is received even if the DC1 control signal is not received from the external device.
App - 27
Transmission of data from a BASIC program is controlled by DC1/DC3 control signals
received from an external device.
If a DC1 control signal is received, data transmission starts or continues.
If a DC3 control signal is received, data transmission is stopped. When a data
transmission is stopped due to the reception of the DC3 control signal, the remaining
data will be sent when a DC1 control signal is received again later.
A
D51H
Channel open
1
Send buffer
Waiting to send
Transmission result
Communication module
(OS)
Data
DC3 control signal
DC1 control signal
Data
MELSEC-Q
External device
App - 27
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