Hello,
For the temporary installation during construction a simple topology was used for minimal functions and to evaluate and test products (for example checking real world coverage for presence detectors):
- 0.x.x - IP backbone
- 1.1.x - TP line, with IP router on 1.1.0
Property is two story home, with a separate physical KNX line wired for each story and additional KNX wires for outside. There are around 80 KNX devices planned, which include presence detector for each room or distinct area in open space, wall and bed-side switches for control where presence alone cannot be used, Jung LS Touch devices in most important rooms as thermostats and control of minor functions, underfloor heating and air conditioning units integrated into KNX.
However above topology might not be well suited for actual installation because:
1) total calculated current for all KNX devices is ~1200mA (under 600mA per floor plus little bit for outside and distribution ), which is awfully close to 1280mA capability of the larger power supplies and would prevent expanding the installation with new devices in future without changing topology;
2) there are few motion/presence detectors and switches, and in future weather station and automated flag pole outside; it would be best to isolate those on a separate line for security.
Option 1
- 0.x.x - IP backbone
- 1.0.x - TP main line with devices in distribution and Floor 1 or 2
- 1.1.x - TP line with devices for second floor, with bus coupler to main line
- 1.2.x - TP line with outside devices, with bus coupler to main line
This would require 3 KNX power supplies, 1 IP router, 2 TP bus couplers, and each of the TP lines would leave plenty of room to expand if switching to 1280mA power supplies
Option 2
- 0.x.x - IP backbone
- 1.0.x - TP main line with all indoor devices on it, with 1280mA power supply, which would be sufficient initially
- 1.1.x - TP line for outdoor devices with bus coupler to main line
This would require one less power supply and TP coupler initially, but could the main line be expanded in future if 1280mA current has to be exceeded without reorganizing physical addresses? KNX documentation states that a single line (1.0.x in this case) can be split into multiple segments, each with it's own power supply and TP repeater (essentially a TP coupler without filter table and coupling same physical address ranges on both sides), however I have never seen or tried such deployment in practice.
There is of course Option 3 - IP backbone with 3 IP routers and 3 TP main lines, but TP couplers are much cheaper than IP routers, so this makes no sense.
Which of the options do you think is the best, or maybe there is a better way?
Thanks,
Jekabs
For the temporary installation during construction a simple topology was used for minimal functions and to evaluate and test products (for example checking real world coverage for presence detectors):
- 0.x.x - IP backbone
- 1.1.x - TP line, with IP router on 1.1.0
Property is two story home, with a separate physical KNX line wired for each story and additional KNX wires for outside. There are around 80 KNX devices planned, which include presence detector for each room or distinct area in open space, wall and bed-side switches for control where presence alone cannot be used, Jung LS Touch devices in most important rooms as thermostats and control of minor functions, underfloor heating and air conditioning units integrated into KNX.
However above topology might not be well suited for actual installation because:
1) total calculated current for all KNX devices is ~1200mA (under 600mA per floor plus little bit for outside and distribution ), which is awfully close to 1280mA capability of the larger power supplies and would prevent expanding the installation with new devices in future without changing topology;
2) there are few motion/presence detectors and switches, and in future weather station and automated flag pole outside; it would be best to isolate those on a separate line for security.
Option 1
- 0.x.x - IP backbone
- 1.0.x - TP main line with devices in distribution and Floor 1 or 2
- 1.1.x - TP line with devices for second floor, with bus coupler to main line
- 1.2.x - TP line with outside devices, with bus coupler to main line
This would require 3 KNX power supplies, 1 IP router, 2 TP bus couplers, and each of the TP lines would leave plenty of room to expand if switching to 1280mA power supplies
Option 2
- 0.x.x - IP backbone
- 1.0.x - TP main line with all indoor devices on it, with 1280mA power supply, which would be sufficient initially
- 1.1.x - TP line for outdoor devices with bus coupler to main line
This would require one less power supply and TP coupler initially, but could the main line be expanded in future if 1280mA current has to be exceeded without reorganizing physical addresses? KNX documentation states that a single line (1.0.x in this case) can be split into multiple segments, each with it's own power supply and TP repeater (essentially a TP coupler without filter table and coupling same physical address ranges on both sides), however I have never seen or tried such deployment in practice.
There is of course Option 3 - IP backbone with 3 IP routers and 3 TP main lines, but TP couplers are much cheaper than IP routers, so this makes no sense.
Which of the options do you think is the best, or maybe there is a better way?
Thanks,
Jekabs
Kommentar