322
Table 11-5: Register Address Format for Function Code 21
Register Address(es)
(Dec)
Register Address(es)
(Hex)
Format
1 to 2048 1 to 800 analog formatted data
(2 registers – IEEE 32-bit floating point)
2049 to 4096 801 to 1000 integer formatted data
(1 register – 16-bit integer)
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 UDC Usage
263 107 (Hex) Computer Setpoint
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).
Request Message (Write Gain 1= 1.5 "ID Tag 1")
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
Chapter 11 - Modbus RTU Function Codes 20&21
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