Installation guide

Page 18 of 51
2.2 Bacnet, Modbus and Metasys N2 Registers
Table 5: Modbus and Bacnet IP/MSTP Register Addresses
Parameter
Name
Modbus
Address
(hex)
Modbus
Register
(dec)
Bacnet
/
N2 Data
Type
Bacnet/ N2
Object ID
LonWorks
Object ID
Read/Write Note
Limits
0004
0004
AI
/AI
1
0
R
15
-
12 Reserved (always 0)
11 = Heat exchanger high limit
10 = Exchanger T-rise limit
9 = Outlet T-rise limit
8 = Inversion inlet/exchanger limit
7 = Inversion exchanger/outlet limit
6 = Inversion inlet/outlet limit
5 = Delta T inlet/exchanger limit
4 = Delta T exchanger/outlet limit
3 = Delta T inlet/outlet limit
2 = Stack limit
1 = DHW high limit
0 = Outlet high limit
Demand
Source
0006
0006
AI
/AI
2
1
R
0 = Unknown
1 = No source demand
2 = CH
3 = DHW
4 = Lead Lag slave
5 = Lead lag master
6 = CH frost protection
7 = DHW frost protection
8 = No demand due to burner switch
turned off
9 = DHW storage
10 = Reserved