LG GLOFA-GM Series User Manual page 289

Chapter 8 Exercising program
3) Communication protocol of temperature controller
For communication between Cnet I/F module and temperature controller, communication type of temperature
controller is to be informed of. The example describes how to prepare program supposing that communication
protocol is as shown in [Figure 8.20].
[Figure 8.20] Communication protocol of temperature controller
A) Write request frame(Cnet's request : Write data of 12 channels in temperature controller)
Classification
Frame
B) Read request frame(Cnet's request : Read temperature value of 12 channels in temperature controller)
Classification
Frame
A) Write request frame
B) Read request frame
C) Response frame
Header Device ID
[DLE][STX] 01
Device
Header
ID
[DLE][STX] 01
Command Address
01 30
BCC calculation range
Command Address
02 80
BCC calculation range
8-38
Channel
Data
number
0c 12-word data
BCC Tail
[DLE][ETX]
Channel
BCC
number
0c [DLE][ETX]
Tail