Honeywell SMV800 - 3.2.6. User defined Function codes

Page 108 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)