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Siemens
RXB21.1, RXB22.1 Room controllers
CM2N3873en_06
Building Technologies
02 Apr 2010
Compatibility
The RXB2… room controller is compatible with field devices from Siemens Building
Technologies and with KNX / EIB-compatible third-party devices.
For details, refer to the DESIGO RX hardware overview, CA2N3804.
Design
The RXB2... controllers consist of a housing base, a housing cover and the printed
circuit board with connection terminals. The controllers also have a tool socket, a
service LED and a programming pin.
Plug-in connection terminals
Housing cover
Plug-in connection terminals
38
73
J0
1
Cable restraints
Plug-in connection terminals
for KNX / EIB bus
Housing base
Service LED
Programming pin
Tool socket
The programming LED shows the operational status of the room controller as follows:
Green flashing
OK, device is in operation
Red ON
Addressing mode (ACS / ETS)
Fault
Orange / green flashing
Parameter download
OFF
No supply voltage
Fault
Service LED disabled by software
Other patterns
Start-up (approx. 5.sec)
Fault
The programming pin is used to identify the controller in the commissioning phase.
Pressing this pin causes the red programming LED to light up and remain on until
identification of the controller is complete.
Once the programming pin has been pressed, the tool overwrites the hardware address
in the room controller.
If there are no terminal covers fitted, the programming pin may be operated only by a
qualified electrician.
The adjacent terminal may be a live mains voltage conductor.
Service LED
Programming pin
