Honeywell SMV800 - Page 121

Revision 1.0 SMV800 Modbus User's Guide Page 109
Request
Field Name
Bytes
Hex
Slave ID
1 Byte
0xF5
Function Code
1 Byte
0x41
Byte Count
(file number + record number + record length)
1 Byte
0x06
File Number
2 Bytes
0x0001
Record Number
2 Bytes
0x0001
Record Length
2 Bytes
0x0001
Response
Field Name
Bytes
Hex
Slave ID
1 Byte
0xF5
Function Code
1 Byte
0x41
Byte Count (file number +
record number + record
data)
1 Byte
0x26
File Number
2 Bytes
0x0001
Record Number
2 Bytes
0x0001
Record Data
Parameter id for
Slave Address
Parameter size
Configuration
history Data for
Slave Address
27 Bytes
1 Byte
1 Bytes
32 Bytes
0x00
0x02
0x00 F7 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00
So the last parameters that was in history record 1 is slave address which was changed from
247 (00 F7). Current slave address from request and response is 245(0xF5). Which means
slave address is changed from 247 to 245 and the value of 247 is recorded as history.