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Siemens
RXB (KNX) Applications library
CLC and RAD description of functions for CC-02 CM110384en_03
Building Technologies
General / central functions
28 Feb 2009
10.1 Send heartbeat and Receive timeout
In a KNX network, S-mode and LTE mode communication objects can be exchanged
between individual devices. The receive
timeout defines the period of time within which
all communication objects of a device must be received at least once. If a
communication object is not received within this period, a predefined value is used and
an error message generated. This ensures that interruptions in communication are
identified at an early stage.
Similarly, send
heartbeat defines the period of time within which all requested
communication objects must be transmitted at least once.
The time intervals are based on the size of the network. Normally the basic setting can
be retained. In the case of S-mode communication objects, shorter times may be
selected for smaller networks or for test purposes. The receive timeout must always be
longer than the send heartbeat.
Parameter Basic
setting
Range
Resolution
Receive timeout
60 min
0 ... 105 min
5 min
Send heartbeat
45 min
0 ... 105 min
5 min
(0 = not enabled)
Fixed times are specified as follows:
•
Receive timeout
: 31
min
•
Send heartbeat
: 15
min
HandyTool
Parameter Short
name
Basic setting
*128
Receive timeout
60
min
*127
Send heartbeat
45
min
10.2 Digital inputs
The following potential-free contacts can be connected to digital inputs D1 and D2:
•
Presence detector or window contact (see section
).
•
Dewpoint sensor (see section 8.2.5).
Digital input
Function
Contact action
HandyTool
Input 1
Input 2
*113
*114
Not used by the
application
Free: Bus = 1
= Contact closed
Free: Bus = 1
= Contact open
0 = Default
1
(Free input, contact can be used freely (see page 111).
Occupancy
Occupied
= Contact closed
Occupied
= Contact open
3
2
Window
Window open
= Contact open
Window open
= Contact closed
4
5
Dewpoint
Dewpoint
= Contact closed
Dewpoint
= Contact open
8
9
Do not connect the same type of sensor / functions to both digital inputs.
The controller would ignore the second input.
S-Mode
LTE and S-mode
Note