LSIS Master-K K1000S - Page 170

Chapter 13 RS-232C function of K200S MASTER-K
13-24
4) Response format (PLC à External device : NAK response)
Format
name
Header
Station
number
Main
instruction
Registration
number
Error code Tail
Fra me
check
Frame
example
ENQ h01 Y (y) h01 h1132 EOT BCC
ASCII
value
h05 h3031 h59 (79) h3031 h31313332 h04
① Station number, main instruction, and registration number are same as the request
format.
② When the main instruction is small character (y), the lower byte of summation from
NAK to ETX is converted into ASCII format and added to frame as BCC check.
③ The error code is expressed as 2 byte of hexadecimal format ( 4bytes of ASCII
codes) and indicates the type of error. Please refer the error code table for details.
5) Example
Execute the registration number 1 of station number 1. Assume that reading single device
(D000, word) is already registered as number 1 and the contents of D000 is h3202. (No
BCC check)
① Request format (External device à PLC)
Format
name
Header
Station
number
Main
instruction
Registration
number
Tail
Frame
example
ENQ h01 Y h01 EOT
ASCII
value
h05 h3031 h59 h3031 h04
② Response format (PLC à External device : ACK response)
Format
name
Header
Station
number
Main
instruction
Registration
number
Number
of blocks
Length of
data
Data Tail
Frame
example
ACK h01 Y h01 h01 h02 h3202 ETX
ASCII
value
h06 h3031 h59 h3031 h3031 h3032 h33323032 h03
③ Response format (PLC à External device : NAK response)
Format
name
Header
Station
number
Main
instruction
Registration
number
Error code Tail
Frame
example
ENQ h01 Y h01 h1132 EOT
ASCII
value
h05 h3031 h59 h3031 h31313332 h04