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Technical Manual
State 04/2025 - Version 1.0
KNX Bus Power Supply with diagnostic function
STC-xxx0.01
Further documents:
Datasheet:
https://www.mdt.de/EN_Downloads_Datasheets.html
Assembly and Operation instructions:
https://www.mdt.de/EN_Downloads_Instructions.html
Solution proposals for MDT products:
https://www.mdt.de/en/for-professionals/tips-tricks.html
MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany
Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de
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Summary of Contents for MDT STC 0.01 Series
- Page 1 KNX Bus Power Supply with diagnostic function STC-xxx0.01 Further documents: Datasheet: https://www.mdt.de/EN_Downloads_Datasheets.html Assembly and Operation instructions: https://www.mdt.de/EN_Downloads_Instructions.html Solution proposals for MDT products: https://www.mdt.de/en/for-professionals/tips-tricks.html MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de...
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Page 2: Table Of Contents
5.2 List of tables ............................32 6 Appendix ............................33 6.1 Statutory requirements .........................33 6.2 Disposal ..............................33 6.3 Assembly ...............................33 6.4 History ..............................33 MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 2 / 33... -
Page 3: Overview
KNX Bus Power Supply with diagnostic function, 6 SU MDRC, 960 mA ■ STC-1280.01 KNX Bus Power Supply with diagnostic function, 6 SU MDRC, 1280 mA ■ MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 3 / 33... -
Page 4: Functions
KNX Bus Power Supply with diagnostic function [STC-xxx0.01] 2.2 Functions Bus Power Supply The overload-safe and short-circuit-proof MDT bus power supply STC reliably supplies the bus participants of a KNX line with a stabilised DC voltage of 30 V. Unchoked power output The device also has an unchoked 30 V voltage output for supplying components which require an auxiliary voltage. -
Page 5: Wiring Diagram
Figure 1: Wiring diagram Note: It is not permitted to connect several STC - Bus Voltage Supplies in parallel. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 5 / 33... -
Page 6: Structure And Handling
■ A device is missing or not responding. ■ Table 1: Function of button and status LEDs MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 6 / 33... -
Page 7: Commissioning
5. Set and programme the individual address in the ETS (Programming LED turns off). 6. Configure and programme the settings in the application programme. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de... -
Page 8: Communication Objects
Minimum of current value 2 Byte ■ ■ ■ 4 Byte Table 3: Communication objects – Standard settings: Current monitoring MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 8 / 33... - Page 9 Alarm at exceedance of 1 Bit ■ ■ ■ temperature Table 6: Communication objects – Standard settings: Temperature monitoring MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 9 / 33...
- Page 10 Event memory for status output Reset 1 Bit ■ ■ Table 8: Communication objects – Standard settings: Status output MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 10 / 33...
- Page 11 C stands for communication, R for read, W for write, T for transmit and U for update. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de...
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Page 12: Ets Parameter
This object interrupts the bus power supply for 20 seconds, forcing a bus reset and restart of all devices connected to the bus power supply. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de... - Page 13 4 Byte restart. If „Object selection“ → „4 Byte“. Table 11: Communication objects – General settings MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 13 / 33...
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Page 14: Temperature Monitoring
Sending a value for exceeding / not exceeding exceedance of temperature the maximum temperature. Table 14: Communication objects – Diagnosis functions: Temperature monitoring MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 14 / 33... -
Page 15: Current Monitoring
Maximal current STC-0640.01 900 mA STC-0960.01 1300 mA STC-1280.01 1600 mA Table 16: Current monitoring – Threshold values MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 15 / 33... - Page 16 Transmit the lowest measured current value. value 4 Byte Table 17: Communication objects – Diagnosis functions: Current monitoring MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 16 / 33...
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Page 17: Voltage Monitoring
(“... at not lower deviation” = “1”) can be sent. In these cases, the other value is set to “0”. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de... - Page 18 Transmit the lowest measured voltage value. Minimum of voltage value 4 Byte Table 19: Communication objects – Diagnosis functions: Voltage monitoring MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 18 / 33...
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Page 19: Bus Traffic Monitoring
Example: Either an alarm message (“...at exceedance” = “1”) or a message that the bus load is below 60 % (“...at not exceedance” = “1”) can be sent. In these cases, the other value is set to “0”. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de... - Page 20 Transmit the value of the lowest bus load. Minimum of bus traffic Table 21: Communication objects – Diagnosis functions: Bus traffic monitoring MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 20 / 33...
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Page 21: Status Output
■ reset button and restart Table 22: Settings – Diagnosis functions: Status output MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 21 / 33... -
Page 22: Status Message In Plain Text
Table 24: Status messages in plain text Note: There are 2 different status functions. These are described in the following chapters described. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 22 / 33... -
Page 23: Status Output Of Last Event
Sending a string sequence is achieved by setting “one-time sending of string” and can be used, for example, to send e-mails with the MDT IP interface / IP router. Here, the object “status output of the last event – status text” is transmitted three times in succession with different values. -
Page 24: Device Monitoring
KNX bus. If „Objects for disconnecting ...” → „active“. Table 25: Settings – Device monitoring: General settings MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 24 / 33... - Page 25 Not active → active from now Figure 5: Diagram – Device monitoring after locking via lock object MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 25 / 33...
- Page 26 If the problem persists, this switching operation will not be repeated. MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de...
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Page 27: Device 1
“Device 1” has failed. next device Table 28: Communication objects – Monitoring device 1 (... 100) MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 27 / 33... -
Page 28: Monitor Device Via Physical Address (Active Request)
■ group 4 ■ group 5 ■ Table 29: Settings – Monitor device via physical address (active) MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 28 / 33... -
Page 29: Monitor Device Via Group Address (Active Request)
2 Byte 4 Byte next device Table 31: Communication objects – Monitor device via group address (active) MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 29 / 33... -
Page 30: Monitor Device Via Group Address (Passive Receiving)
2 Byte 4 Byte next device Table 33: Communication objects – Monitor device via group address (passive) MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 30 / 33... -
Page 31: Index
Figure 5: Diagram – Device monitoring after locking via lock object ..............25 Figure 6: Diagram – Topology for switching KNX participants ................26 MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de... -
Page 32: List Of Tables
Table 32: Settings – Monitor device via group address (passive) ..............30 Table 33: Communication objects – Monitor device via group address (passive)..........30 MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de... -
Page 33: Appendix
Use in the USA and Canada is prohibited! 6.4 History V 1.0 First version of technical manual DB V1.1 04/2025 MDT technologies GmbH · Papiermühle 1 · 51766 Engelskirchen · Germany Telephone: +49 (0) 2263 880 · knx@mdt.de · www.mdt.de 33 / 33...
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