Appendices
CM-2201/CM-2202
Appendix E
Modbus Address List
©2018 Nelson Heat Tracing Systems
www.nelsonheaters.com
GA2497 Rev.6
28
Modbus
Register
Data Address
Length
Bytes
bits
Variable name
Description/ Value Range
40044
43
2
0
Units
0 = °F
1 = °C
1
Enable Heater (CH.1)
0 = No
1 = Yes
2
External Disable (CH.1)
0 = Disable
1 = Enable
3
Control Type (CH.1)
0 = On/Off
1 = Proportional
4
RTD Operation (CH.1)
000 = Single RTD Mode
001 = Backup
010 = Average
011 = Lowest
100 = Highest
101 = High Temp Cut-out
5
6
7
RTD Failure Mode (CH.1)
0 = Off
1 = On
8
Enable Password
0 = Disable
1 = Enable
9
Display Mode
0 = Normal
1 = Advanced
10
Default Display
00 =System Status
01 = Heater Status
10 = Heater Temp
11
12
Baud Rate
001 = 2400 bps
010 = 4800 bps
011 = 9600 bps
100 = 19200 bps
13
14
15
Heater Type (CH.1)
0 = Fixed resistance
1 = Self-regulating
40201
200
2
Maintain Temp in °F
= x per 1°F (-58 to +932)
(ch2)
= 32766 if Set to None
= 32767 if Set to Off
40202
201
2
Maintain Temp in °C
= x per 1°C (-50 to +500)
(ch2)
= 32766 if Set to None
= 32767 if Set to Off
40203
202
2
Low Temp Alarm in °F
= x per 1°F (-58 to +932)
(ch2)
= 32767 if Set to Off
40204
203
2
Low Temp Alarm in °C
= x per 1°C (-50 to +500)
(ch2)
= 32767 if Set to Off
40205
204
2
High Temp Alarm in °F
= x per 1°F (-58 to +932)
(ch2)
= 32767 if Set to Off
40206
205
2
High Temp Alarm in °C
= x per 1°C (-50 to +500)
(ch2)
= 32767 if Set to Off
40207
206
2
Deadband in °F
(ch2)
= x per 1°F (1 to 10)
40208
207
2
Deadband in °C
= x per 1°C (1 to 5)
(ch2)
