LSIS XGL-C22A, Руководство пользователя, Страница: 112 / 299

Chapter 7 XGT Dedicated Communication
7-10
(4) Example
Example that M020’s 1 word and P001’s 1 word of station No.1 are read.
(At this time, it is supposed that H1234 is in M020 and H5678 is in P001.)
(a) XGT client’s request frame that requests reading single variable
Classification Head Station
no. Instruction
Instruction
type
No. of
block
Variable
length
Variable
name
Variable
length
Variable
name
Tail
Frame
Check
Frame ENQ 01 R(r) SS 02 06
%MW02
0
06 %PW001 EOT BCC
Hex h05 h3031 h52(72) h5353 h3032 h3036
h254D57
303230
h3036
h2550573
0303031
h04
(b) Response frame of XGT server
▷
In case of ACK response
Classification Head Station
no. Instruction
Instruction
type
No. of
block No. of data
Data
No. of
data
Data Tail Frame
Check
Frame ACK 01 R(r) SS 02 02 1234 02 5678 ETX BCC
Hex h06 h3031 h52(72) h5353 h3032 h3032
h3132333
4
h3032 h35363738 h03
▷
In case of NAK response
Classification Head Station
no.
Instruction Instruction type Error code Tail Frame check
Frame NAK 01 R(r) SS Error code (2 byte) ETX BCC
Hex h15 h3031 h52(72) h5353 Error code (4 byte) h03