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(5） Data frame error (Master transmission)
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.
HITACHI
Master (PC)
1
2
3
ENQ code (05H)
ACK code
(
06H
)
Send data (ASCII code)
Send data (ASCII code)
Send data (ASCII code)
4
5
Send data (ASCII code)
6
3 second
elapse
3 second
elapse
3 second
elapse
Slave
(KP-F500PCL/SCL
KP-FR500PCL/SCL)