is there a way to get a cheap knx switch interface?
I know, i can connect ordinary wall switches with knx binary inputs and so i can switch lights or do something like this.
But binary inputs are expensive. KNX-Sensors are much more expensive.
So if there is a cheap way to get a small knx interface behind a wall switch, this would be great? Something small like tpuart-interface maybe?
The cheapest way is the hardest way (yes, german native ) http://selfbus.myxwiki.org/xwiki/bin/view/Geräte/Taster/TasterBJ about 8EUR per wall switch, plus hours of happy soldering…
That´s it! But sad, that you can´t buy it completely soldered…
Is there anyone whon sells ready-to-use selfbus items?
Since several months have passed, I was curious about what you (or others here) ultimately chose? I too am looking for something to interface “traditional” switches and buttons.
My priorities include:
- Low latency
- Ease of long-term maintenance
- Some short of shielding/isolation between said I/O and Ethernet (or other interface)
- OH2 integration
To achieve this, I am willing to pull wires wherever this helps. My ducts don’t have room to pull all the existing light switch wires to a single central location. However, as thinner cabling is used for the signal-only wires, I should be able to have all wires converge to only two locations. These already have DIN rails, a separate low-voltage area and Ethernet.
I too did consider a set of small distributed KNX or (Z-Wave or ZigBee) I/O boxes, but that is ending up to be quite expensive, and I am not sure about the maintenance in all those different places, one or more decades from now.
So right now I am increasingly looking at something like the Moxa ioLogik E1210 (description, PDF), which has 16 inputs for $185 (price from industrialnetworking.com).