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Chapter 8 Communication Functions
8-25
(4) Response Format (NAK response)
Format name Header Station No. Command
Registration
No.
Error code
(Hex 2Byte)
Tail Frame check
Frame (Example)
NAK H10 Y(y) H09 H1132 ETX BCC
ASCII value H15 H3130 H59(79) H3039 H31313332 H03
Item Explanation
BCC
When command is lowercase(y), only one lower byte of the value resulted by adding 1 Byte
each to ASCII values from NAK to ETX is converted into ASCII and added to BCC, and
sent.
Error code
Hex and 2 bytes (ASCII code, 4 bytes) indicate error type. For the details, see 8.1.8 Error
codes.
(5) Example
This example supposes that registered device No. 1 of station No. 1 is read. and BCC value is checked. And it is supposed
that device M000 is registered and the number of blocks is 1.
① Computer request Format (PC → MASTER-K120S Main Unit)
Format name Header Station No. Command
Registration No. Tail Frame check
Frame (Example)
ENQ H01 y H01 EOT BCC
ASCII value H05 H3031 H79 H3031 H04
② For ACK response after execution of command (PC ← MASTER-K120S Main Unit)
Format name Header Station No. Command
Registration
No.
Number of Blocks
Number of
data
Data Tail
Frame
check
Frame (Example)
ACK H01 y H01 H01 H04 H23422339 ETX BCC
ASCII value H06 H3031 H79 H3031 H3031 H3034
H3233343232
333339
H03
③ For NAK response after execution of command (PC ← MASTER-K120S Main Unit)
Format name Header Station No. Command
Registration No. Error code Tail Frame check
Frame (Example)
NAK H01 y H01
Error code
(2) ETX BCC
ASCII value H15 H3031 H79 H3031
Error code
(4) H03