Amtech
11.14
10
11
2 03h Indication of read operation
3 14h Total 20 data bytes packed after byte 3.
4-23 20 Bytes Data Bytes are in the ascending orders of parameter number. First two
for 40001, next two for 40002 and so on.
24 CRC Low CRC Low Byte
25 CRC High CRC High Byte. The High and Low bytes are reversed in CRC
transmission. The method of calculating CRC is described in the next
section.
5.3 Write Single Parameter
This query is used for single parameter read. Total 8 bytes are transmitted. 3.5-character times delay
is provided at the start and end of the query for indication of starting and ending of query
For example if you want to write parameter 40096 then the format of query is as below. The range of
this parameter is 0.0 to 100.0. If the sending value is 40.0 then the transmitted value in query is 40.0 *
10 = 400 because this parameter has resolution of 1 digit after decimal. After converting to
hexadecimal it becomes 190h.
Number
1 01h First byte is the address of the modbus slave device referred as station
number.
2 06h Indication of single write operation
3 00h Starting address High byte
4 5Fh Starting Address Low byte. Parameter 40096 is addressed as 005Fh.
Byte 3 and 4 has right justified packed value of parameter number.
5 01h Data High Byte
6 90h Data Low Byte.
7 CRC Low CRC Low Byte
8 CRC High CRC High Byte. The High and Low bytes are reversed in CRC
transmission. The method of calculating CRC is described in the next
section.
If the query is received properly then the response is the echo of the query after the value is being set.
5.4 Write Multiple Parameter
This query is used for multiple parameters Write. 3.5-character times delay is provided at the start and
end of the query for indication of starting and ending of query.
For example if you want to read parameter 40084 to 40093 then the format of query is as below. Then
total 29 bytes transmitted.
Number
1 01h First byte is the address of the modbus slave device referred as station
number.
2 10h Indication of multiple write operation
3 00h Starting address High byte
4 53h Starting Address Low byte. Parameter 40084 is addressed as 0053h.
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