Specifications

MODBUS COMMUNICATION MANUAL
2-13
2.3.2 BMS Controller Standard Holding Register Assignments
The Holding Register address assignments for the BMS are listed in Table 2-3 which follows.
Unless otherwise specified, all Holding Register Menu items are Read/Write (R/W).
Table 2-4. BMS Standard Holding Register Address Mapping
Modbus Data
Address (Hex) Menu Item Units and Range Default/Comments
0x0000 (Reserved)
0x0001 (Reserved)
0x0002 (Reserved)
0x0003 (Reserved)
0x0004 Net Header Set
Temp
40 to 220°F Valid when Remote
Signal = Network
0x0005 System Start Temp 32 to 120°F Default = 70°F
0x0006 System Start Mode 0 or 1
0 = Temp Only,
1 = Temp and Load
Default = 0
0x0007 Manual Hdr Set
Temp
40 to 220°F Default = 160°F
0x0008 Reference Temp 40 to 220°F Default = 70°F
0x0009 Indoor Prop Band 0.0 to 20.0°F/°F
(0.5°F/°F increments)
Default = 00.0°F/°F
(Value x 10)
0x000A Indoor Setpoint
Temp
50 to 150°F Default = 70°F
0x000B Reset Ratio 0.3 to 3.0
(0.1 increments),
Default = 1.2
(Value x 10)
0x000C
Max Header Temp
40 to 220°F Default = 220°F
0x000D
Min Header Temp
40 to 220°F Default = 40°F
0x000E
Start Percent
25 to 100% Default = 45%
0x000F
Stop Percent
10 to 45% Default = 18%
0x0010
Integral Gain
0.00 to 9.99 Rep/Min
(in 0.01 increments
Default = 0.15 Rep/Min
(Value x 100)
0x0011
Header Set Mode
0, 1, or 2
0 = Constant Setpt
1 = In/Outdoor Reset
2 = Remote Setpt
Default = 1
(In/Outdoor Reset)