BAS Integration Manual

© 2015 680_B - 10/15
6 of 8
A Watts Water Technologies Company
Register Parameter Name
Read/
Write
Units Type Format Range
Input Registers (Starts at 40,000)
1 Model R Enum Input U16 680
2 Firmware Revision R Enum Input U16 SVN revision
3 Application Version R Enum Input U16
Software (A= 1, B = 2, ...
Z = 26)
4 Error Code R Enum Input U16 See Error Codes list
5 Operation R Enum Input U16
0 = Off,
1 = Idle,
2 = Storm,
3 = Melt
6 Operation Status R Enum Input U16
0 = Normal,
1 = WWSD,
2 = CWSD,
3 = Timed Melting,
4 = Warming Up,
5 = Pending
7 Manual Melt Time Remaining R Minutes Input U16 0 to 1440 minutes
8 Additional Melt Time Remaining R Minutes Input U16 0 to 360 minutes
9 Outdoor Air Temperature R °F Input S16 -67 to 149°F
10 Slab 1 Temperature R °F Input S16 -58 to 167°F
11 Slab 1 Water R Enum Input U16 0 = Dry, 1 = Wet
12 Slab 2 Temperature R °F Input S16 -58 to 167°F
13 Slab 2 Water R Enum Input U16 0 = Dry, 1 = Wet
14 Coldest Slab Temperature R °F Input S16 -58 to 167°F
15 Slab Target Temperature R °F Input S16 20 to 120°F
16 Combined Water Status R Enum Input U16 0 = Dry, 1 = Wet
17 Boiler Supply R °F Input S16 -31 to 266°F
18 Boiler Return R °F Input S16 -31 to 266°F
19 Boiler Target R °F Input S16 50 to 230°F
20 Boiler Output R % Input U16 0 to 100%
21 System Supply R °F Input S16 -31 to 266°F
22 System Return R °F Input S16 -31 to 266°F
23 Mix System Target R °F Input S16 50 to 230°F
24 Mix System Output R % Input U16 0 to 100%
25 System Pump R Enum Input U16 0 = Off, 1 = On
26 Primary Pump R Enum Input U16 0 = Off, 1 = On
27 Boiler Pump R Enum Input U16 0 = Off, 1 = On
28 System Flow Rate R GPM Input U16 0 to 1000 US GPM
29 System Pressure R PSI Input U16 0 to 300 psi
30 PWM and Electric Heat Output R % Input U16 0 to 100%
31 Melting Energy (low word) R Therms Input U16 0 to 65535
32 Melting Energy (high word) R Therms Input U16 0 to 65535
Modbus Parameters
Read = R Read/Write = R/W