16
(3) Processing at the time of SUM value error occurred
①
Transmitted to the slave the command of illegal SUM value from the master.
②
If the SUM value is illegal received command, the slave discards the contents of the received,
send "NAK" to the master, the end of the handshake.
(4) Processing when a communication error has occurred.
①
Master sends data, but error detected (framing, over-run error).
②
Master If the ACK response does not come within three seconds, to re-send the command.
③
Master send the correctly data.
④
Slave sends a "ACK code" after receiving the correctly data.
Master (Machine)
1
2
1
Illegal command SUM value
(STX-ETX.??)
NACK code (15H)
Slave
(HV-F32SCL)
HITACH
3CCD
Master (Machine)
1
(error occurs)
(STX-ETX.SUM)
(correctly data)
(STX-ETX.SUM)
normal)
ACK code (06H)
2
3
4
3 second
elapse
3 second
elapse
Slave
(HV-F32SCL)
HITACH
3CCD
(error occurs)
(STX-ETX.SUM)
Содержание HV-F130SCL
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