Appendix D: Modbus Ascii - Thermo Scientific TSX Series Installation And Operation Manual

Appendix D: Modbus ASCII

Parameter Table
Protocol MODBUS ASCII
Baud Rate 2400bps to 57.6Kbps
Data Bits 7
Stop Bits 1
Parity Even
Flow Control None
Address 0 to 255
Function
S.No Parameter
Code
Cabinet
1 Setpoint 0x03
(C)
Warm
Alarm
2 0x03
Setpoint
(C)
Ultra Low Temperature Freezers
Address in Modbus
Size
hexadecimal Command
3a 31 39
30 33 30
35 33 30
530 2
30 30 30
32 41 44
0d 0a
3a 31 39
30 33 30
35 33 38
538 2
30 30 30
32 41 35
0d 0a
Relay
Data
Enclosure Data
Type
Response
3A 31 39
30 33 30
0xF
34 46 46
FFF
46 46 46 int
FCE
43 45 30
0
30 32 0D
0A
3A 31 39
30 33 30
0xF
34 46 46
FFF
46 46 46 int
FD4
44 34 34
4
39 44 0D
0A
Appendix D: Modbus ASCII Parameter Table |
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 the data value into
signed 2's complement
and divide with 10, which
gives the setpoint.
Ex: Signed 2's
complement of the
0xFFFFFD44 is equal to 
-700.
-700/10= -70.
So the WA setpoint is 
-70 C.
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