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Chapter 8 Exercising program
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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 Header Device ID Command Address
Channel
number
Data
Frame [DLE][STX] 01 01 30 0c 12-word data
BCC calculation range
BCC Tail
[DLE][ETX]
B) Read request frame(Cnet’s request : Read temperature value of 12 channels in temperature controller)
Classification Header
Device
ID
Command Address
Channel
number
BCC Tail
Frame [DLE][STX] 01 02 80 0c [DLE][ETX]
BCC calculation range
GLOFA Cnet
User defined master
Temperature controller
Slave station
A) Write request frame
C) Response frame
B) Read request frame