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9-2-3. Basic procedure of communication
① In case of KP with communication option, communication is possible at any point of time.
② In RS―422A/RS-485, first of all data link is established and then communication with KP is
performed according to the communication format. In the end the data link is released and made
available for next communication.
③ In RS-232C, communication with KP is done according to the communication format from the
beginning.
④ If a command is sent for KP from high order PC or if parameter setting and pattern setting is done KP
does not accept it and a negative response is sent if FNC key or the corresponding mode is not
locked.
In this case, please lock the FNC key or the corresponding mode.
⑤ In case of data request command from high order PC, KP outputs the data regardless of lock/no lock
status. (However, pattern setting data is output in case of RESET only)
⑥ When KP receives a data request from high order PC, if the request is correct, the data is sent. If the
request is incorrect or if data sending is not possible, a negative response is sent.
⑦ When KP receives parameter setting, command from high order PC, if the command and the
settings are correct a positive response is sent after internal processing.
If there is a mistake in the setting, command or if setting, command cannot be received, a negative
response is sent.
9-2-4. Control code
Following code is used during communication.
STX(Text start signal) : 02H
ETX(Text end signal) : 03H
ACK(Positive response) : 06H
NAK(Negative response) : 15H
[RS-422A/485]
ENQ(Enquiry signal) : 05H
EOT(Transmission end signal) : 04H
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