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BC7300
Query
Byte Name
Example
Slave address 11
Function code 4
Start address high 0
Start address low 0
Count high 0
Count low 2
Error Check
LRC / CRC
End of frame
Response
The Bus Terminal Controller answers with byte count 4, i.e. 4 bytes of data
are returned. The query was for 2 input words, and these are now
distributed over 4 bytes.
Byte Name
Example
Start frame
Slave address 11
Function code 4
Count byte 4
Data 1 high byte 0
Data 1 low byte 56
Data 2 high byte 63
Data 2 low byte 11
Error Check
LRC / CRC
End of frame
RTU
Description
0x0B
0x04
0x00
0x00
0x00
0x02
Number of data words
0x71
0x61
t1-t2-t3
RTU
Description
0x0B
0x04
0x04
Number of data bytes
0x00
Address %QB129
0x38
Address %QB128
0x3F
Address %QB131
0x0B
Address %QB130
0x80
0x7E
t1-t2-t3
45
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