Modbus RTU Function Codes
Register Address Structure
Table 9-1 Integer Parameter Type
Register
Numbers
(Dec)
Name Access Notes
Type = 1 NOT SUPPORTED 16-bit Unsigned Integer
2 Attribute NOT SUPPORTED 1 = Read Only,
2 = Read/Write
3 Value (16 bit integer) Read / Write
4 Not Used NOT SUPPORTED
5 Low Range (16 bit integer) NOT SUPPORTED
6 Not Used NOT SUPPORTED
7 High Range (16 bit Integer) NOT SUPPORTED
8 Not Used NOT SUPPORTED
9 to 13 Description Text (ASCII string) NOT SUPPORTED
1
Table 9-2 Floating Point Parameter Type
Register
Numbers
(Dec)
Access Notes
1 Type = 2 NOT SUPPORTED IEEE Floating Point
2 Attribute NOT SUPPORTED 1 = Read Only,
2 = Read/Write
3 Value (float high word) Read / Write
4 Value (float low word) NOT SUPPORTED
5 Low Range (float high word) NOT SUPPORTED
6 Low Range (float low word) NOT SUPPORTED
7 High Range (float high word) NOT SUPPORTED
8 High Range (float low word) NOT SUPPORTED
9 to 13 Description Text (ASCII string) NOT SUPPORTED
Name
Register Count
The register count depends on the data format of the registers being read or written.
Integer data is represented in sixteen bits and is transferred high byte first.
Floating point data is transferred in IEEE 32-bit format.
The register count definitions are:
0001 = Integer Data
0002 = Floating Point Data
12/04 UDC3200 Universal Digital Controller Product Manual 177
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