Saia-Burgess Controls AG
Manual for PCD7.L79xN room controllers
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Document 27 / 602
E
N02 │ 2013-11-27
Communication
Function
3-1
3
3 Function
3.1 Communication
3.1.1 Functions, commissioning
Automatically detecting the Serial S-Net baudrate
After the current is switched on, the compact room controllers attempt to detect
the baudrate on the S-Bus for themselves. During this time, the controller does not
function. For this, it is necessary for the communication master to send telegrams on
a cyclical basis. Where a Saia PCD
®
is used, this task is handled by the "Setup" FBox
from the "PCD7_L79x room controller" group. Once the room controller has detected
the baudrate, it stores this information. After a restart, it will begin by setting this
baudrate. Only when the room controller cannot establish any communication with
the last used baudrate does it restart baudrate detection.
The picture shows a SASI interface initialisation and the Setup FBox.
The activated Setup FBox makes cyclical attempts to establish a connection to
station address 252 (see service pin on the room controller). As the service pin is not
normally activated on any room controller, station address 252 is not present. The
LED for the SASI S-Bus master FBox is then red.
After successful commissioning of the room controllers, it is therefore advisable
to deactivate the Setup FBox via the "Enable" input. If proper communication is
established, the LED for the SASI S-Bus master FBox should stay green.
