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(1) Transmission from master (normal process)
① Session starts when ENQ is sent from master to slave.
② Slave acknowledges by returning ACK to master.
③ Master sends data to slave.
④ Slave acknowledges receipt of data by again returning ACK to master and end the handshake.
(2） Master reads data (normal process)
① Session starts when ENQ is sent from master to slave.
② Slave acknowledges by returning ACK to master.
③ Master sends read command to slave.
④ Slave receives read command, then acknowledges by returning ACK code to master.
⑤ Slave sends read data to master.
⑥ Master receives read data, then acknowledges by returning ACK code to slave.
Slave
(KP-F500PCL/SCL
KP-FR500PCL/SCL)
HITACHI
Master (PC)
1
2
3
4
ENQ code (05H）
ACK code
(
06H
)
ACK code
(
06H
)
Transmit data
(
ASCII code
)
HITACHI
Master (PC)
1
2
3
4
ENQ code (05H)
ACK code
(
06H
)
Read command (ASCII code)
ACK code (06H)
6
5
Read data
(
ASCII code
)
ACK code (06H)
Slave
(KP-F500PCL/SCL
KP-FR500PCL/SCL)