A.O. Smith BMS Interface - Parameter List

38
Instruction manual - BMS Interface
4.1 Parameter list
Para-
meter
Register
type
Value
Type
Unit
Description
Conversion
y = first byte
x = second byte
Unit type
BFC
SGS
SGE
0
03
16 bits direct
Address
-
Actual Modbus address BMS Interface
-
Yes
Yes
Yes
1
03
16 bits direct
Temperature
°C
Temperature in the top of the water heater
x/100
Yes
Yes
Yes
2
03
16 bits direct
Temperature
°C
Temperature in the bottom of the water heater
x/100
Yes
Yes
Yes
3
03
16 bits direct
Temperature
°C
Flue gas sensor (dummy)
x/100
n.a.
n.a.
n.a.
4
03
16 bits direct
Temperature
°C
Set point water heater
x/100
Yes
Yes
Yes
5
03
16 bits direct
Delta T
K
Hysteresis up gas burner
x/256
Yes
Yes
Yes
6
03
16 bits direct
Delta T
K
Hysteresis down gas burner
x/256
Yes
Yes
Yes
7
03
16 bits direct
State
-
Unit state
-
Yes
Yes
Yes
8
03
16 bits direct
Relay
-
Relay: Potable water pump
1=Closed, 0=Open
Yes
Yes
Yes
9
03
16 bits direct
Burning hours
Hours
Burning hours water heater
-
Yes
Yes
Yes
10…14
03
16 bits direct
Error
-
Last 5 lock outs (internal codes)
-
Yes
Yes
Yes
15…19
03
16 bits direct
Error
-
Last 5 blocking errors (internal codes)
-
Yes
Yes
Yes
20
03
16 bits direct
Error
-
Actual error code (internal code)
-
Yes
Yes
Yes
21
03
16 bits direct
Relay
ON/OFF
Relay: External ON / OFF
1=Closed, 0=Open
Yes
Yes
Yes
22
03
16 bits direct
Solar State
-
State solar control
-
n.a.
Yes
Yes
23…27
03
16 bits direct
Error
-
Last 5 solar errors (internal codes)
-
n.a.
Yes
Yes
28
03
16 bits direct
Temperature
°C
Temperature solar collector (S1)
x/100
n.a.
Yes
Yes
29
03
16 bits direct
Temperature
°C
Solar temperature in the bottom of the tank (S2)
x/100
n.a.
Yes
Yes
30
03
16 bits direct
Temperature
°C
Solar temperature in the top of the storage tank (S3)
x/100
n.a.
Yes
n.a.