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SMV800 Modbus User's Guide
Revision 1.0
3.2.6.
User defined Function codes
Function code – 65 (Read file records)
Below are the details to read configuration change history data from device to
demonistrate how to read file records
Each record has following data:
1 byte for Parameter identification
1 byte for Parameter size
32 bytes of data (based on size and parameter id, host has to
decode value to be displayed).
Config history table with parameter size and order of parameters:
Table 3-3: Configuration History
Parameters Name/ Description
Parameter Size
Order of Parameters
(for multiple
parameters)
Slave Address
2
NA
Turn around delay
2
NA
Baud Rate and Parity
4
Baudrate, Parity
Process Temperature URV/LRV
8
URV, LRV
Damping for Process Variables
20
DP, SP, PT,Flow,MBT
Damping of DP
4
NA
Damping of SP
4
NA
Damping of PT
4
NA
Damping of Flow
4
NA
Damping of MBT
4
NA
Flow Cut Off Limits (Low/High)
8
Low Limit, High Limit
DP Unit Code
2
NA
SP Unit Code
2
NA
PT Unit Code
2
NA
Flow Unit Code
2
NA
MBT Unit Code
2
NA
Totalizer Unit Code
2
NA
Software Write Protect
2
NA
Tamper Parameters
6
Tamper Mode (2
bytes), Latency (2
bytes) and Max
attempts (2 bytes)
Summary of Contents for SMV800
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