4. COMMUNICATION PROTOCOL
IMCB03-E3
22
(6) Acknowledgment [ACK]
Send [ACK] when the host computer could receive data items correctly.
Next, the controller sends the identifier data following the identifier just sent in succession shown in
"'
Communication identifier list
" (P. 28).
If data send from the controller is suspend, send [EOT] to terminate the data link.
(7) Negative acknowledge [NAK]
If the host computer cannot receive send data correctly from the controller, it sends [NAK] to the
controller. Then, the controller re-sends the same data to the host computer.
As the number of re-send times is not specified, take the necessary measures on the host computer
side if no recovery is made.
(8) No response from host computer
When the host computer is set to no response after the controller sends data, the controller sends
[EOT] as time-out processing to terminate the data link (time-out time : about 3 sec).
(9) Indefinite response from host computer
When the response from the host computer is indefinite, the controller sends [EOT] to terminate the
data link.
(10) Data link termination [EOT]
If it is necessary to suspend communication with the controller or to terminate the data link due to no
response from the controller, the host computer sends [EOT].
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