4. RKC STANDARD COMMUNICATION
IM9000F02-E2
29
(5) Negative acknowledge [NAK]
The REX-F9000 sends [NAK] in the following cases. Then the appropriate recovery processing
steps, such as data resend on the host computer side should be taken.
z
When an error occurs on the line (parity, framing error, etc.).
z
When a BCC check error occurs.
z
When there is no identifier.
z
When receive data is not in the specified configuration
(Text is not in the "Iden data construction.")
z
When the number of receive data digits exceeds 7.
z
When normally receive data exceeds the setting range.
(6) No response
If the selecting address is not received correctly, the REX-F9000 is set to no response, if [STX],
[ETX] and [BCC] is not received correctly, the REX-F9000 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 REX-F9000 was set to no response, send [EOT] from the host computer.