BAS Integration Manual

© 2015 680_B - 10/15
7 of 8
A Watts Water Technologies Company
Modbus Parameters
Read = R Read/Write = R/W
33 Melting Hours (low word) R Hours Input U16 0 to 65535
34 Melting Hours (high word) R Hours Input U16 0 to 65535
35 Heat Cycles (low word) R Enum Input U16 0 to 65535
36 Heat Cycles (high word) R Enum Input U16 0 to 65535
37 System Pump Run Time (low word) R Hours Input U16 0 to 65535
38 System Pump Run Time (high word) R Hours Input U16 0 to 65535
39 Primary Pump Run Time (low word) R Hours Input U16 0 to 65535
40 Primary Pump Run Time (high word) R Hours Input U16 0 to 65535
41 Boiler Pump Run Time (low word) R Hours Input U16 0 to 65535
42 Boiler Pump Run Time (high word) R Hours Input U16 0 to 65535
Holding Registers (Starts at 30,000)
1 Outdoor Sensor Enable R/W Enum Holding U16
0 = Control to measure
outdoor air temperature,
1 = BAS to send outdoor air
temperature
2 BAS Outdoor Temperature R/W °F
Holding S16 -67 to 149°F
3 Melt Setpoint R/W °F
Holding U16 32 to 95°F
4 Idle Enable R/W Enum
Holding U16
0 = Idling disabled,
1 = Idling enabled
5 Idle Setpoint R/W °F
Holding U16 20 to 95°F
6 Storm Enable R/W Enum
Holding U16
0 = Storm disabled,
1 = Storm enabled
7 Storm Setpoint R/W °F
Holding U16 20 to 95°F
8 Manual Melt Time R/W Hours
Holding U16 30 to 1440 minutes
9 Add Melt Time R/W Hours
Holding U16 0 to 360 minutes
10 Storm Run Time R/W Hours
Holding U16 30 to 1440 minutes
11 Snow/Ice Sensitivity 1 R/W Enum
Holding U16
0 = Auto, 1 = Min, 2 = -2,
3 = -1, 4 = Mid, 5 = +1,
6 = +2, 7 = Max
12 Snow/Ice Sensitivity 2 R/W Enum
Holding U16
0 = Auto, 1 = Min, 2 = -2,
3 = -1, 4 = Mid, 5 = +1,
6 = +2, 7 = Max
13 Warm Weather Shut Down Enable R/W Enum
Holding U16
0 = WWSD disabled
1 = Manual WWSD setting
14 Warm Weather Shut Down Temperature R/W °F
Holding S16 32 to 95°F
15 Cold Weather Cut Out Enable R/W Enum
Holding U16
0 = CWCO disabled
1 = Manual CWCO setting
16 Cold Weather Cut Out R/W °F
Holding S16 -30 to 50°F
17 Melt/Stop Request R/W Enum
Holding U16 0 = Off, 1 = Melt
18 Storm/Stop Request R/W Enum
Holding U16 0 = Off, 1 = Storm