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6
Chapter
Example of Transmitting a Message (For Engineering Unit)
The message is composed as follows when reading the PV input lower limit and PV input upper limit from station number 2.
• PV Lower Limit Relative Address: 03F9H
■
Meaning of Read Data
PV Input Lower Limit 00 00H = 0
PV Input Upper Limit 01 90H = 400
If Decimal Point Position = 0, then the PV input upper limit and lower limit are as follows.
PV Lower Limit = 0°C
PV Upper Limit = 400°C
Refer to
For more about the internal calculation value, engineering unit,
and decimal point see
"Chapter 7, Address Map and Data Configuration" (p. 39).
Master Slave
Command Message (bytes)
Station No. 02H
Function Code 03H
No. to Start Reading
(Relative Address)
Upper number 03H
Lower number F9H
No. of Words to Read
Upper number 00H
Lower number 02H
CRC Data
Upper number 14H
Lower number 4DH
Response Message (bytes)
Station No. 02H
Function Code 03H
No. of Bytes to Read 04H
First Word Data
Contents
Upper number 00H
Lower number 00H
Next Word
Data Contents
Upper number 01H
Lower number 90H
CRC Data
Upper number C8H
Lower number CFH
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