6. RKC COMMUNICATION
IMS01J02-E2
58
(3) Data sent from the host computer
The host computer sends data for the selecting sequence with the following format:
If the length of send data (from STX to BCC) exceeds 128 bytes, it is divided into blocks by
ETB. In this case, the succeeding divided data is sent after STX.
Details for
1
to
6
, see
6.1.1 Polling (P. 52)
.
(4) ACK (Acknowledgment)
An acknowledgment ACK is sent by the SR Mini HG SYSTEM when data received is correct. When
the host computer receives ACK from the SR Mini HG SYSTEM, the host computer will send any
remaining data. If there is no more data to be sent to SR Mini HG SYSTEM, the host computer sends
EOT to terminate the data link.
(5) NAK (Negative acknowledge)
If the SR Mini HG SYSTEM 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 SR Mini HG SYSTEM 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 SR Mini HG SYSTEM
The SR Mini HG SYSTEM does not respond when it can not receive the selecting address, STX, ETB,
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 SR Mini HG SYSTEM.
Identifier Data
BCC
ETB
STX
3.
2.
6.
4.
1.
Identifier Data
BCC
ETX
STX
3.
2.
6.
5.
1.
or
