Thermo Scientific TSX Series Installation And Operation Manual page 79

Function
S.No Parameter
Code
Cabinet
23 Calibration 0x03
Offset
Line
24 0x03
Voltage
74 | Appendix D: Modbus ASCII Parameter Table
Address in Modbus
Size
hexadecimal Command
3a 31 39
30 33 30
35 33 34
534 2
30 30 30
32 41 39
0d 0a
3a 31 39
30 33 30
34 46 38
4F8 2
30 30 30
32 45 36
0d 0a
Relay
Data
Enclosure Data
Type
Response
3A 31 39
30 33 30
0xF
34 30 30
FFF
30 30 30 int
FCE
30 30 30
0
44 43 0D
0A
3A 31 39
30 33 30
0x0
34 30 30
000
30 30 30 uint
00E
30 45 34
4
46 34 0D
0A
Ultra Low Temperature Freezers
Remarks
Convert the data value into
signed 2's complement
and divide with 10,which
gives the setpoint.
Ex: Signed 2's
complement of the
0xFFFFFCE0 is equal to 
-800.
-800/10=-80.So the
setpoint is 
-80C.
Convert hex to decimal
gives the voltage.
Ex. Here 0xE4 is equal to
228 V