Version: 2020-09-04
148
Copyright of the European Union is effective (Copyright EU) (c) 2019 GENEREX Systems GmbH, Hamburg, Germany, All rights reserved
TEL +49(40)22692910 - EMAIL generex@generex.de - WEB www.generex.de (This and all other product datasheets are available for download.)
The BACS Bus topology
As well-known from network technology, there are always different ways to connect nodes and devices with each other. You need to
choose the best solutioin for the according task and take care not to connect all nodes in a way to set up a network short ciruit...
When connecting BACS modules, there less things to be obeyed - the wiring of the BACS modules follows two simple rules:
Rule 1: Each ID can only be assigned once
One single Strain:
On delivery, BACS module and BACS sensors use the basic ID 0. When the BACS Web Manager calls the address 0, all modules are
addressed. During initialization via BACS Programmer, the individual BACS modules receive a single unique ID. This ID is once inside
this BACS installation. The module installation order does not follow the according row of address ID's: After initialization, the BACS
Web Manager queries individual addresses and the addressed module will respond accordingly.
Two or more stains:
Inside the strain, the ID’s hast o be sorted by a specific order. Between different strains, the pool of numbers must be sorted:
Strain 1: Module-ID 1 – 10
Strain 2: Module-ID 11 – 20
Strain 3: Module-ID 21 – 30
Never mix ID module pools between strains!
Rule 2: Obeye the maximum cable length
The better the signal, the more stable the entire BACS system will finally work
Rule 3: Obeye magnetic interferences
Any live wire produces a magnetic field that affects other metallic objects and conductors. Although the BACS cables are specially
shielded against magnetic influences, the installation site can strongly take effect to the quality of the data signal. If you have a lot of
interference, test for these magnetic interferences.
Connection examples
in genereal, BACS does not tell you how to connect all modules each other - a structured wirinig method will help you to do
maintenance work as well as finding problems during installation. Furthermore, well-structured connection methods will help to improve
reliability when operated. Due to this fact, there are some hints you should need to before wiring. Both, the BACS Bus Converter as well
as the BACS Webmanager Budget provide two ports for a BACS bus. The possibility to select the appropriate installation type allows
different setup scenarios
1. The classic ring topology:
The advantage in the ring topology is a high reliability:
The BACS webmanager can use different cable routes to query a
BACS module. The target BACS module can answer the same way.
Should a cable fail, there is a second redundant connection that can
compensate this for some time. The entire system is still fully
operatianable.
A disadvantage of this design is that the the arrangement of the
batteries in must meet certain characteristics, since the first and the
last battery must be connected to the BACS Web Manager,
otherwise the ring can not be closed.
Furthermore, you need to stop at the maximum lenght to reach the
last module in a row from both sides:
If there is a problem with the first cable, the signal needs to be
routed through the last module to to the first module. If the
maximum lenght is exxeeded, ist will not work.
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