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Siemens
Central control unit RMB795B
CE1P3122en
Building Technologies
Communication
18.01.2012
13 Communication
See basic documentation "Communication via KNX bus" (order number:
CE1P3127en) for a detailed description of communications.
The following section only gives a description of the most important settings so that
a basic plant can be commissioned.
13.1 Activate communication
Communication is active when:
•
The device address is entered (each bus member requires an individual device
address),
•
Bus power supply is available
•
The device is not in commissioning mode.
No.
Text
Effect
5000
No bus power supply
Non urgent message; must not be
acknowledged.
6001
>1 identical device
address
Urgent message; must be acknowledged.
13.2 "Communication" menu
13.2.1 Factory settings
Main menu > Commissioning > Communication > Basic settings >
Operating line
Range
Factory setting
Device address
1...253 (1...255)
255
bus power supply,
decentral
Off, On.
On.
Clock time operation
Autonomous, slave, master.
Autonomously
remote setting clock
slave
Yes, no
Yes
remote reset of fault
Yes, no
No
Each bus member requires an individual device address.
Device addresses 254 and 255 are reserved for special functions. Device address
255 is used to deactivate communication (no exchange of process data).
If two devices on the KNX bus have the same device address, fault message
"> 1 identical device address" is triggered.
For small plants, decentralized power supply suffices. This represents the default
setting.
See data sheet N3127 (KNX bus) or basic documentation CE1P33127en (KNX
communication) for more information.
If there is no bus supply, fault message "No bus power supply" appears.
Introduction
3 criteria for activation
Fault status messages
Setting values
"Device address"
operating line"
"Decentral bus power
supply" operating line