Preset Single Register (Function 6)
The Preset Single Register function can be used to access the output process image and the interface.
The first analog output is written with function 6. The analog outputs start at an offset of 0x0800. Here again the offset always describes a word. This means offset 0x0803 refers to the fourth word in the output process image.
Query
|
Byte Name |
Modbus RTU |
Modbus ASCII | ||
|---|---|---|---|---|
|
Start - Frame |
- |
- |
":" |
0x3A |
|
Address |
11 |
0x0B |
"0B" |
0x30, 0x42 |
|
Function-Code |
6 |
0x06 |
"06" |
0x30, 0x36 |
|
Start-Address high |
8 |
0x06 |
"06" |
0x30, 0x36 |
|
Start-Address low |
0 |
0x00 |
"00" |
0x30, 0x30 |
|
Data high |
63 |
0x3F |
"3F" |
0x33, 0x46 |
|
Data low |
255 |
0xFF |
"FF" |
0x46, 0x46 |
|
Error Check, LRC/CRC |
|
0xDA, 0xB0 |
"A9" |
0x41, 0x39 |
|
End - Frame |
|
t1-t2-t3 |
CRLF |
0x0D, 0x0A |
The Fieldbus Coupler replies with the same telegram and confirmation of the received value.
Response
|
Byte Name |
Modbus RTU |
Modbus ASCII | ||
|---|---|---|---|---|
|
Start - Frame |
- |
- |
":" |
0x3A |
|
Address |
11 |
0x0B |
"0B" |
0x30, 0x42 |
|
Function-Code |
6 |
0x06 |
"06" |
0x30, 0x36 |
|
Start-Address high |
8 |
0x06 |
"06" |
0x30, 0x36 |
|
Start-Address low |
0 |
0x00 |
"00" |
0x30, 0x30 |
|
Data high |
63 |
0x3F |
"3F" |
0x33, 0x46 |
|
Data low |
255 |
0xFF |
"FF" |
0x46, 0x46 |
|
Error Check, LRC/CRC |
|
0xDA, 0xB0 |
"A9" |
0x41, 0x39 |
|
End - Frame |
|
t1-t2-t3 |
CRLF |
0x0D, 0x0A |