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(5） Data frame error (Master transmission)
HITACHI
Slave
(KP-FM500WCL
KP-FMD500WCL)
① Session starts when ENQ is sent from master to slave.
② Slave acknowledges by returning ACK to master.
③ Master sends data.
④ For some reason, slave does not receive data.
⑤ Master does not receive acknowledgment to the send code and repeats the sequence every 3
seconds for 3 times.
⑥ If unsuccessful after 3 attempts, master aborts the sequence and ends communication.
ENQ code (05h)
ACK code (06h)
2
Send data (ASCII code)
4
Send data (ASCII code)
Send data (ASCII code)
Send data (ASCII code)
1
3
3 second
elapse
5
3 second
elapse
Master (Machine)
3 second
elapse
6
12
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