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Table 11-5: Register Address Format for Function Code 21
Register Address(es)
(Dec)
1 to 2048
2049 to 4096
Unrestricted Registers
As mentioned previously, all register data is stored in the EEROM of
this instrument with some exceptions. These exceptions were made
to allow write access to override information. The registers, which are
designated as Override values, are listed below. These registers do
not have restrictions on the number of writes.
ID Tag
Register Number
263
107 (Hex)
Restrictions on Parameter Numbers in One Message
The maximum number of writable parameters per write request is 1.
Write Configuration Examples
Example #1
The following is an example of a request to write the Gain 1 value
using Function code 21 (15 Hex).
(Write Gain 1= 1.5 "ID Tag 1")
Request Message
02 15 0B 06 00 03 00 01 00 02 3F C0 00 00 (CRC16)
Where:
02 = Address
15 =Function Code 21 (15 hex)
0B = Byte Count
Register Address(es)
(Hex)
1 to 800
801 to 1000
Chapter 11 - Modbus RTU Function Codes 20&21
Format
analog formatted data
(2 registers – IEEE 32-bit floating point)
integer formatted data
(1 register – 16-bit integer)
UDC Usage
Computer Setpoint
322
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Troubleshooting
