4. COMMUNICATION PROTOCOL
IMCB03-E4
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(4) Acknowledgment [ACK]
If the controller correctly received data sent from the host computer, send [ACK]. Then, if there is
data to be sent next on the host computer side, send the data.
After the data has been sent, send [EOT] to terminate the data link.
(5) Negative acknowledge [NAK]
The controller sends [NAK] in the following cases. Then the appropriate recovery processing steps,
such as data resend on the host computer side should be taken.
When an error occurs on the line (parity, framing error, etc.).
When a BCC check error occurs.
When there is no identifier.
When receive data is not in the specified configuration
(Text is not in the "Identifier + data construction.")
When the number of receive data digits exceeds 6.
When normally receive data exceeds the setting range.
When the identifier not added to the controller is specified.
(6) No response
If the selecting address is not received correctly, the controller is set to no response, if [STX], [ETX]
and [BCC] is not received correctly, the controller is also set to no response.
(7) Data link termination [EOT]
When terminating the data link because there was no more to be sent on the host computer side or the
controller was set to no response, send [EOT] from the host computer.
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