Communications ASDA-B2-F
8-8 September, 2015
8
RTU Mode:
Command Message (Master): Response Message (Slave):
Address 01H
Address 01H
Slave Function 06H Slave Function 06H
Start Data Address
02H (High)
Start Data Address
02H (High)
00H (Low) 00H (Low)
Data Content
00H (High)
Data Content
00H (High)
64H (Low) 64H (Low)
CRC Check Low 89H (Low) CRC Check Low 89H (Low)
CRC Check High 99H (High) CRC Check High 99H (High)
Note:
Before and after transmission in RTU mode, 10 ms of silent interval is needed.
Example 3: function code10H, writing multiple words:
The master issues command to the 1
st
slave and writes 0BB8H and 0000H to the start data
address 0112H. That is to say, 0BB8H is written into 0112H and 0000H is written into 0113H. The
maximum allowable data in one single access is 10. The slave sends the response message to
the master after the writing is completed. The calculation of LRC and CRC will be described in
the following section.
To Next Page
Loading...
Need help?
General
