Device Interface Specification (Rxb/Rxl); Communications Basics - Siemens Desigo RXB Technical Manual

Interface
Communication signal:
Konnex S-mode
(supported by RXB
only – not by RXL)
Konnex LTE mode
(fully supported by
RXB –
partially supported by
RXL, for Synco)
RXL communication
Siemens
Building Technologies
4.3

Device interface specification (RXB/RXL)

Interface type
Transceiver
Baud rate
Transmission mode
Bus power supply
Power consumption bus supply
Polarity for bus lines CE+ (red), CE– (black)
The communication signal (information) is transferred symmetrically, i.e., as
voltage difference between the two bus lines (and not as a voltage difference to the
earthing potential). The sign preceding the voltage between CE+ and CE–
determines signal values 0 and 1.
4.4

Communications basics

The RXB controller supports the Konnex S-mode (system mode). This corresponds
to earlier EIB communications technology and is 100% backward compatible. Data
points are connected using the ETS (EIB Tool Software by Konnex) through "group
addresses" (designation for a connection).
COV
HB
Physical address
Device I
The RXB controller supports Konnex LTE mode (LTE = Logical Tag Extended).
Device data points are assigned to various zones (e.g. outside air temperature
input for an outside zone, the room temperature input, operating mode output,
valve control output, etc., for a geographic zone). Devices are assigned zone
addresses during commissioning. Data points within the same zone then exchange
their process values. Non individual connections required.
COV
HB
Physical address
Device I
RXL communication is proprietary and NOT Konnex compatible. It serves to
communicate with a DESIGO management station of a Synco control unit.
Installation guide RXB, RXL
Konnex bus technology
Group address A
Group address B
Zone ZZ
A
B
TP1
TP-UART (integrated in device)
9.6 kbps (fixed for TP1)
half duplex
DC 30 V
5 mA
non-interchangeable
COV
HB
Physical address
Device II
COV = Change of Value
HB = Heart Beat
COV
HB
Physical address
A
B Device II
COV = Change of Value
HB = Heart Beat
CM110381en_01
28 Feb 2009
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