4. PROTOCOL
IMAE02-E3
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(6) ACK (Acknowledgment)
An acknowledgment ACK is sent by the host computer when data received is correct. When the
AE500 receives ACK from the host computer, the AE500 will send any remaining data of the next
identifier without additional action from the host computer.
For the identifier, see 4.3 Communication Identifier List (P. 28).When host computer
determines to terminate the data link, EOT is sent from the host computer.
(7) NAK (Negative acknowledge)
If the host computer does not receive correct data from the AE500, it sends a negative
acknowledgment NAK to the AE500. The AE500 will re-send the same data when NAK is received.
This cycle will go on continuously until either recovery is achieved or the data link is corrected at the
host computer.
(8) No response from host computer
When the host computer does not respond within approximately three seconds after the AE500 sends
data, the AE500 sends EOT to terminate the data link.
(9) Indefinite response from host computer
The AE500 sends EOT to terminate the data link when the host computer response is indefinite.
(10) EOT (Data link termination)
The host computer sends EOT message when it is necessary to suspend communication with the
AE500 or to terminate the data link due lack of response from the AE500.
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