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3 Available variables
These variables are available when communicating with the Base
PRO controller (with the Modbus RTU compatible software installed).
3.1 Temperature conversion
Note
If no data value is availabe the celcius value is set to
1802.6.
The Uponor Smatrix Base PRO controller uses Fahrenheit (default)
to read and calculate temperatures. The temperature format can be
changed in the U_BMS.txt file.
To convert the data value into celcius, use the following mathematical
formula.
Celcius = ((data value – 320)/1.8)/10
Temperature (absolute value)
Celsius (˚C)
Fahrenheit (˚F)
-40.0
-40.0
-30.0
-22.0
-20.0
-4.0
-17.8
0.0
-10.0
14.0
-5.0
23.0
0.0
32.0
1.0
33.8
5.0
41.0
10.0
50.0
15.0
59.0
18.0
64.4
20.0
68.0
21.0
69.8
25.0
77.0
30.0
86.0
35.0
95.0
40.0
104.0
Temperature (relative value)
Celsius (˚C)
Data value
0.1
2
1.0
18
4.0
72
5.0
90
Data value
Hex value
-400
0xFE70
-220
0xFF24
-40
0xFFD8
0
0x0
140
0x8C
230
0xE6
320
0x140
338
0x152
410
0x19A
500
0x1F4
590
0x24E
644
0x284
680
0x2A8
698
0x2BA
770
0x302
860
0x35C
950
0x3B6
1040
0x410
Hex value
0x02
0x13
0x48
0x5A
Uponor Smatrix Base PRO Controller X-148 Modbus RTU
Humidity (absolute value)
Relative humidity (%)
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
3.2 Controller limitations
Cooling state
An ordinary Base PRO system (with touch screen, not connected to a
BMS) uses an offset temperature to adjust the setpoints when
switching between heating and cooling. This setting is only available
via the touch screen interface (I-167), which is not installed when
connected to a BMS.
When connected to a BMS, and the heating/cooling state is set to
cooling, the cooling offset is set to 0 °C (0 °F), leaving the zone
setpoints to be changed by the BMS.
ECO state
If the Base PRO system is set to ECO state the controller applies an
ECO setback value of 4 °C (4 °F) to the setpoints (which is shown in
the thermostats).
When the BMS reads the setpoint, when in ECO state, it will receive
the actual setpoint (without the ECO setback value applied).
Example
Setpoint written/read from BMS
Comfort/ECO state
Setpoint shown in thermostat
Hex value
0x0000
0x0005
0x000A
0x000F
0x0014
0x0019
0x001E
0x0023
0x0028
0x002D
0x0032
0x0037
0x003C
0x0041
0x0046
0x004B
0x0050
0x0055
0x005A
0x005F
0x0064
21 °C (69.8 °F)
1 (ECO)
17 °C (62.6 °F)
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Installation manual
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