15 / 46 
Siemens  Wall-mounted sensors and room operator units for KNX/ETS and KNX/ACS  CM2N1602en_05 
Building Technologies  Mounting and electrical installation   2018-09-14 
 
 
• Fol
low the KNX regulations
• For KNX wiring (topology, allowed cables and cable length), see the document
KNX bus [4].
• Use the correct cables for the KNX bus
• Do not interchange the wires of the KNX cable.
– The red terminal is for KNX +
– The gray terminal is for KNX –
• Obs
erve all local installation regulations.
Th
e devices are not protected against accidental connection to AC 230 V. 
Inf
ormation in topology and addressing in KNX networks is available in document 
KNX bus [4]. The following information requires electrical installation as per the 
KNX-TP1 standard.