Specifications

MODBUS COMMUNICATION MANUAL
2-9
2.3 BMS CONTROLLER STANDARD REGISTER ASSIGNMENTS
2.3.1 BMS Controller Standard Input Register Assignments
The Read Only Input Register address assignments for the BMS are listed in Table 2-3 which
follows on the next page.
Table 2-3. BMS Standard Input Register Address Mapping
Modbus Data
Address (Hex) Menu Item Units and Range Default/Comments
0x0000
(Reserved)
0x0001
Header
Temperature
40 to 220°F
0x0002
Outside Air
Temperature
-60 to 120°F
0x0003 Indoor Air
Temperature
40 to 160°F
0x0004 Fire Rate Out 0 to 100%
(out to boilers)
0x0005 Header Set
Temperature
40 to 220°F
0x0006 Network Address 0, 128 to 247 Default = 0
(If Address = 0, BMS is
Off-Line as a Slave)
0x0007
Total Boilers Fired
0 to 40
0x0008 Total Boilers On
Line
0 to 40
0x0009
(Reserved)
0x000A Fault/Message
Code
0 to 65535
Bit
:
0 = Outside Air Sensor
1 = Header Sensor Error
2 = Interlock 1 Error
3 = Interlock 2 Error
4 = Indoor Air Sensor Error
5 = 4-20mA Input Error
0x000B
thru
0x000F
(Reserved)
0x0010 Lead Boiler Number 1 to 40