LG MASTER-K 120S Series User Manual page 215

Chapter 8 Communication Functions
(4) Response Format (NAK response)
Format name Header
Frame (Example) NAK
ASCII value H15
Item
BCC
Error code
(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
Frame (Example)
ASCII value
② For ACK response after execution of command (PC ← MASTER-K120S Main Unit)
Format name Header
Frame (Example) ACK
ASCII value H06
③ For NAK response after execution of command (PC ← MASTER-K120S Main Unit)
Format name Header
Frame (Example)
ASCII value
Station No. Command
H10 Y(y)
H3130 H59(79)
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.
Hex and 2 bytes (ASCII code, 4 bytes) indicate error type. For the details, see 8.1.8 Error
codes.
Header Station No.
ENQ H01
H05 H3031
Station No. Command
H01 y
H3031 H79
Station No. Command
NAK H01
H15 H3031 H79
Registration
No.
H09
H3039 H31313332
Explanation
Registration No.
Command
y
H79 H3031
Registration
Number of Blocks
No.
H01 H01
H3031 H3031
Registration No.
y H01
H3031
8-25
Error code
Tail
(Hex 2Byte)
H1132 ETX
H03
Tail
H01 EOT
H04
Number of
Data Tail
data
H04 H23422339 ETX
H3233343232
H3034 H03
333339
Error code Tail
Error code (2) ETX
Error code (4) H03
Frame check
BCC
Frame check
BCC
Frame
check
BCC
Frame check
BCC