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KNX BASIC COURSE
3 Type definition of an application module
BCU PEI AM
Analogue 6 R‐Typ
+5 V
2
3
Data 4
7
9
1/10
0 V
5
+5 V +5 V
8
+20 V +20 V
Figure 4: Type definition of an application module
Via a resistor (R-Type) in the application module, the bus coupling unit is able to detect
via pin 6 of the PEI, whether the application module mounted on the BCU fits to the
loaded application program. When the R-Type does not correspond to the one indicated in
the application program, the BCU automatically halts the application program. However,
this rarely applies to more recent bus devices, as for products without a PEI and with a
fully integrated BCU, such a check is no longer required. So, consequently such a PEI
check is mainly limited to flush-mounted bus coupling units. The underneath table gives
an overview of the principal PEI types.
Home and Building Management Systems KNX Association
KNX Bus Devices Bus devices_E1213a 8/16
