I've been asked to connect and control a finger-sensing device to a Raspberry PI. There is a protocol to respect called OSDP. It supposes a serial connection on top of RS485.

I'm a seasoned C/C++ programmer, but I have very little experience in connecting devices.

I was wondering, to make the task less daunting, maybe I should try a simple "fun project" which will make me feel comfortable with serial communication. Do you have any documentation or books to recommend?

  • Not really a suitable question for this site. Personally I'd google for the model of sensor and raspberry pi. It's quite likely it has been connected to the Pi already.
    – joan
    Oct 8, 2019 at 19:50
  • 2
    Possible duplicate of Raspberry Pi - Connect and power RS485 device
    – abolotnov
    Oct 8, 2019 at 19:51
  • Many finger-sensing device have RS485 and RS232 (TTL UART). If so, then you can just use Rpi's serial/UART RxD, TxD pins to talk to your finger sensor. If you give me the link can check it out for you.
    – tlfong01
    Oct 9, 2019 at 0:37
  • joan, that is not very helpful. Abolotnov, that is very helpful. Oct 9, 2019 at 20:16
  • 1
    You need to find the pinouts. Then connect them and using python you can connect them. Or use an Arduino . There are a lot of tutorials for that. Copy any code and execute. Oct 24, 2019 at 10:01


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