Data-Pool Values
MS24A-R..-MPX
Room sensors in the comfort zone for
MP bus applications

Nominal voltage AC/DC 24V

Temperature measurement

Humidity measurement

CO2

VOC

1 digital input

1 analogue input
Type Overview
Type
Function
MS24A-R01-MPX
MS24A-R02-MPX
Temperature
Temperature, CO2
MS24A-R03-MPX
MS24A-R04-MPX
Temperature, VOC
Temperature, CO2, VOC
MS24A-R05-MPX
MS24A-R06-MPX
Temperature, Humidity
Temperature, Humidity, CO2
MS24A-R07-MPX
MS24A-R08-MPX
Temperature, Humidity, VOC
Temperature, Humidity, CO2, VOC
About this Document
• The device supports the MP Data-Pool functional profile. All available data points are
managed in a data pool and accessible with MP read/write commands.
• This document describes all public data pool values of the device. It's divided into process
values and configuration values.
• The MP Data-Pool functional profile is specified in the MP Cooperation Documentation. The
document is provided to Belimo MP-Partners.
• See the technical datasheet T9-MS24A-R..-MPX for technical information about the device
itself.
Data-Pool Values
Process
ID
Name
Description
Size
Access
11
SensErrState
Error status of the sensors
1
R
2
R
2
R
2
R
2
R
Bit 0:
Bit 1:
Bit 2:
Bit 3:
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12
13
14
SensTempC
15
SensTempF
16
SensRelHumid
17
SensCO2
temperature sensor fault
humidity sensor fault
CO2 sensor fault
VOC sensor fault
The flag is reset automatically, if the error condition
disappears.
Temperature in °C
Unit:
0.01 °C
Range:
0.00 … 50.00 °C
Temperature in °F
Unit:
0.01 °F
Range:
32.00 … 122.00 °F
Relative humidity in %
Unit:
0.01 %
Range:
10.00 … 90.00 %
CO2 content in ppm
Unit:
1 ppm
Range:
0 … 2000 ppm
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MS24A-R..-MPX
Data-Pool Values
Configuration
18
SensVOC
19
20
FlushStatus
21
22
AnalogIn
23
DigitalIn
100 PosString
101 SensVOCdiffTh
102 FlushTime
VOC content
Unit:
1 (pseudo ppm)
Range:
0 … 2000 (pseudo ppm)
VOC gradient threshold exceeded
Range: 0 (air quality ok), 1 (air quality not ok, flush)
 see Application Remarks: Processing VOC values
Analogue Input in mV
Unit:
1 mV
Range:
0 … 10000 mV
Digital Input
Range:
0 (open) / 1 (closed=24V)
2
R
1
R
2
R
1
R
Position string
Default value: ""
Alphanumeric character string to store the position of
the device (optional, helpful for maintenance and
troubleshooting)
VOC gradient threshold
Unit:
1 (no unit)
Range:
0 … 500 (0=disabled)
Default:
200
Duration of flush process in s
Unit:
1s
Range:
300 … 1800 s
Default:
600 s
16
R/W
2
R/W
2
R/W
Application Remarks
Processing VOC values
The device provides the raw VOC content as SensVOC (ID 18), which can be processed with a user
defined algorithm on the master device.
In addition, the device provides a calculated and ready-to-use flush function. The Boolean value
FlushStatus (ID 20) is derived from the gradient of the VOC content and is set, when the defined
threshold value (SensVOCdiffTh, ID 101) is exceeded. It remains true for the duration defined in
FlushTime (ID 102).
The default values used for SensVOCdiffTh and FlushTime should work for most applications. Tuning
the flush function shall be done by increasing/decreasing the parameters and gathering user
feedback.
Power-on behaviour
The initialization of the VOC sensor after power-on takes up to 15 minutes. The value SensVOC (ID
18) remains on 450 during the initialization.
All other sensors (temperature, CO 2, humidity) provide immediately actual values.
Implementation Remarks
Identification
The device is available with different sensor combinations (R01 … R08). The connected type can be
identified by its series number:
Prefix
2
2
Profile Type
1
2
Profile Category
10
10
Type
MS24A-R01-MPX
MS24A-R02-MPX
2
2
3
4
10
10
MS24A-R03-MPX
MS24A-R04-MPX
2
2
5
6
10
10
MS24A-R05-MPX
MS24A-R06-MPX
2
2
7
8
10
10
MS24A-R07-MPX
MS24A-R08-MPX
The master shall check the connected node and limit its read/write queries to existent sensor values.
Configuration
Configuration data are password protected.
The default password is '0000'.
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www.belimo.eu
MS24A-R..-MPX
Timing of MP-Bus queries
Data-Pool Values
Master implementations typically poll the slaves in cycles (MP1, MP2, MP3, …). Reading all data pool
values of this node in one cycle is not recommended, because it would reduce the overall MP-Bus
performance.
Recommendation:
- Check the device type and read out existent sensor values only.
- Split up the queries into several cycles (e.g. 3 queries per cycle).
- Prevent from reading unused data pool values
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