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15-July-2004
6
e) Data frame error (Master transmission)
MasterSlave
ENQ code (05H)
1)
ACK code (06H)
2)
3)
Send data (ASCII code)
4)
3 seconds elaps
e
3 seconds elaps
e
5)
6)
Send data (ASCII code)
Send data (ASCII code)
Send data (ASCII code)
3 seconds elaps
e
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.