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  Hello @Vesa-Kauppinen, it seems you do not have the unipi kernel module loaded. Can you try "lsmod | grep unipi"? If it still does not give any output, try to update unipi packages again.
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  I did buy a Neuron L303 and M303 somewhere last year, to get acquainted with the hardware and to write software to read the digital inputs (e.g. https://github.com/mhemeryck/unipitt). Now that I am nearing the end of the electrical installation of my house, I did start wiring up all of my push buttons, only to find out that a large number of them simply do not work. I first figured it could be related due to the software (I did read there was an issue with the sysfs SDK on which my implementation was based), but the LEDs on the unipi itself does not even light up for these DI. I am hoping it could be a software issue -- but since the LEDs aren't even showing I actually fear for a hardware issue. Can you help me to further debug this?
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  Hello @lessmann, the limit of how many devices can be connected to one RS485 line comes from the RS485 transceiver (the chip on the RS485 output) and on our PLCs it is 32. But be aware, that this is just a theoretical limit and the real limit depends on the current situation. Second limit of the RS485 is the speed of the communication. Since RS485 is a half-duplex type of communication (master can speak only to one slave at a time), the more devices you have the lower speed of updates you will have. If you have PLC with more RS485 ports, you can split the extensions into groups. Best regards, Martin