4. PROTOCOL
IMAE02-E3
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(4) ACK (Acknowledgment)
An acknowledgment ACK is sent by the AE500 when data received is correct. When the host
computer receives ACK from the AE500, the host computer will send any remaining data. If there is
no more data to be sent to AE500, the host computer sends EOT to terminate the data link.
(5) NAK (Negative acknowledge)
If the AE500 does not receive correct data from the host computer, it sends a negative
acknowledgment NAK to the host computer. Corrections, such as re-send, must be made at the host
computer. The AE500 will send NAK in the following cases:
• When an error occurs on communication the line (parity, framing error, etc.)
• When a BCC check error occurs
• When the specified identifier is invalid
• When receive data exceeds the setting range
(6) No response from AE500
The AE500 does not respond when it can not receive the selecting address, STX, ETX or BCC.
(7) EOT (Data link termination)
The host computer sends EOT when there is no more data to be sent from the host computer or there
is no response from the AE500.
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