BSD-340-user-guide-eng, Doc. 1004474-2, 2020-09-18,
Autronica Fire and Security AS
Page 19
5.3.1 Changing system number
When starting a system, the first time after changing system number all loop units on PowerLoops
will be “Not responding” and loop breaks will be presented as well. All loops have to be manually
disabled/enabled to reprogram loop id in all loop units.
1. First initialization sets offset (system number) in BSD-340 – all loop units will have an old
loop ID
2. Topology has to be deleted (see chapter 4.1.1)
3. Manual disable/enable allows reprogramming of new loop ID in loop units
5.4 Crosstalk
The PowerLoop loop driver, BSD-340, uses radio frequencies to communicate with the loop units.
This signal is an amplitude modulated digital signal, transmitted on the power line. Because of
potential long cables, up to 1km, and heavy load, the PowerLoop modem needs to have a large
dynamic range and high sensitivity. Because of this it is quite possible for the data signals to travel
from one loop to another due to capacitive and inductive coupling between the wires or through
the ground system. This means that the PowerLoop systems must be wired properly (see chapter
2.2.3).
Some measures have been implemented in PowerLoop equipment to reduce the effect of
crosstalk. BSD-340 and loop units will operate with a unique loop ID in communication frames
which makes it possible to discriminate between frames from different loops. However, to
establish a loop with unique loop ID, the PowerLoop driver and PowerLoop units need a session
where different loop IDs are accepted. This is to establish a new loop where loop IDs do not exist
or when loop units have a different loop ID than required. This will occur when installing loop
units which already have another loop ID, or when a complete loop is moved to another loop ID
(Changing address switch on loop driver or changing system number, see chapter 0 above). No
topology may exist in loop driver (see chapter 4.1.1) during these sessions, and any loop that is
source to crosstalk to actual loop must be disabled.
5.4.1 +40 setting
The +40 setting is adding 40 to the address switches on BSD-340. This will not change the address
but turn off sending fault message “crosstalk detected” to panel.
Example: switch address 45 equals address 5.
5.4.2 Discover crosstalk
PowerLoop drivers without +40 setting will issue a fault message “Crosstalk detected” with
Data 3, 5 (example values).
These numbers refer to:
• Before comma: AFB address of reporting loop (add system number if different from 0)
• After comma: Loop ID of source of crosstalk.
The reporting loop’s tag will be presented in fault messages heading
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