Honeywell UDC2500 manual Register Address Structure Integer Parameter Type, Register Count

			Modbus RTU Function Codes
Register Address Structure
	Table 9-1 Integer Parameter Type
Register	Name	Access	Notes
Numbers
(Dec)
1	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
	Table 9-2 Floating Point Parameter Type
Register	Name	Access	Notes
Numbers
(Dec)
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

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

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