Table 9-1 Integer Parameter Type; Table 9-2 Floating Point Parameter Type; Register Address Structure; Register Count - Honeywell UDC3500 Product Manual

Modbus RTU Function Codes

Register Address Structure

Register
Numbers
(Dec)
1 Type = 1
2 Attribute
3 Value (16 bit integer)
4 Not Used
5 Low Range (16 bit integer)
6 Not Used
7 High Range (16 bit Integer)
8 Not Used
9 to 13 Description Text (ASCII string)
Register
Numbers
(Dec)
1 Type = 2
2 Attribute
3 Value (float high word)
4 Value (float low word)
5 Low Range (float high word)
6 Low Range (float low word)
7 High Range (float high word)
8 High Range (float low word)
9 to 13 Description Text (ASCII string)

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
320

Table 9-1 Integer Parameter Type

Name

Table 9-2 Floating Point Parameter Type

Name
UDC3500 Universal Digital Controller Product Manual
Access
NOT SUPPORTED
NOT SUPPORTED
Read / Write
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
Access
NOT SUPPORTED
NOT SUPPORTED
Read / Write
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
NOT SUPPORTED
Notes
16-bit Unsigned Integer
1 = Read Only,
2 = Read/Write
Notes
IEEE Floating Point
1 = Read Only,
2 = Read/Write
10/05