RKC INSTRUMENT Z-TIO-G, Instruction Manual, Page: 62 / 246

6. RKC COMMUNICATION
IMS01T28-E4
6-10
Unreceivable data
The SRZ sends NAK when received a following data.

Plus sign and data with a plus sing

Only minus sign (
without a number
)

. Only minus sign and a decimal point
(4) ACK (Acknowledgment)
An acknowledgment ACK is sent by the SRZ when data received is correct. When the host computer
receives ACK from the SRZ, the host computer will send any remaining data. If there is no more data to be
sent to the SRZ, the host computer sends EOT to terminate the data link.
(5) NAK (Negative acknowledge)
If the SRZ 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 SRZ 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

When receive data is the identifier of RO (read only)
(6) No response from SRZ
The SRZ 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 SRZ.