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APPENDIX
Appendix 7.4 Data Flow When an Error Occurs During Data Reception
Appendix 7.4.1 Data flow when a transmission error occurs
ZOPEN to
ZRECEIVE to
Reception result
(Error occurrence)
Receive request
ZRECEIVE to
Reception result
App - 38
The examples in the following figures illustrate the flow of data when a transmission
error (frame error, parity error, overrun error) occurs while receiving data from an
external device.
C
The 0D
(
) data is specified as the single break character and a maximum of 10
H
R
bytes is requested to be received.
(1) When there is no receive buffer
If a transmission error occurs while a BASIC program is receiving data from the
host after requesting to receive data, the data received up to the time when the
transmission error occurred is returned.
(BASIC program)
Communication channel open
Result of channel opening
Receive request
Input element
"A"
"B"
"C"
"D"
Input element
"A"
"B"
"C"
"D"
"E"
"F"
"C R"
Data prior
to reception
Communication module
(OS)
MELSEC-Q
Data
"A"
"B"
"C"
"D"
A transmission
error occurs.
"F"
"C R"
Data
"A"
"B"
"C"
"D"
"E"
"F"
"C R"
Data
App - 38
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