Hi recently I purchased UHF RFID from China supplier


This demo software is not working properly and it is encrypted in Chinese and not functioning properly. I was also looking for an open source software for the above RFID reader, finally, I could not find any, maybe not lucky for the source. Later decided to buy a Raspberry Pi 3. I thought this can only solve my problem.

My practical problems;

RFID reader has been provided an interface of RS232 (cable), unfortunately, I could not able to connect to the RPi. I decided to purchase a USB to Serial converter (Unitech). This is working with windows 10, but I am not sure with RPi. because USB (of the serial converter) would functional on the Pi (if I connect serial converter USB to Pi USB plugin).

Then I decided to connect RFID data 0, 1 cables to GPIO of RPi. You can see the color Yellow and grey are data points.

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Raspberry Pi 3 input CatLog. enter image description here

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According to my knowledge TDX0 (GPIO14, 08 for yellow cable RFID), and RXD0 (GPIO15, 10 for grey cable RFID) are the GPIO connecting points.

I have not connected the data points yet because I am struck with the Python script. What I output need from the RPi. would be is UHF tag number, time of tag detection.

I have seen some of the examples from other developers.

Use Arduino and RS232 Shield to interface Integrated UHF RFID reader LSID-0702


125 KHz RFID tag reader


Long Range UHF RFID Item Tracking System


I am not very good at coding. Can you please help me with the coding! What I need from you is: If there is any tag near to RFID reader (maximum) 6 meters, accept the signal and note the timing, tag number, and the date. Thank you😊

  • You cannot connect rs232 to the GPIO Serial pins. RS232 uses negative and positive voltages and they are higher then the 3.3v logic the pi uses. – Chad G Feb 20 '18 at 6:19
  • Also this is not a place to ask for free coding. The forum is to ask specific questions about problems you are facing. Please do a little research and learning, and come back if you have a specific problem we can help with – Chad G Feb 20 '18 at 6:20

a USB to Serial converter

As far as I am aware, like many basic USB peripherals, those are reasonably standardized, and a stock linux kernel should have drivers available.

but I am not sure with RPi. because USB (of the serial converter) would functional on the Pi (if I connect serial converter USB to Pi USB plugin)

It probably will. Plug it in and check ls -1 /dev | grep ttyUSB. You should get something like ttyUSB0 back. You can use /dev/ttyUSB0 exactly like you use /dev/ttyS0 or /dev/serial0 or whatever it is you normally use to access the GPIO UART.

If it doesn't show up in /dev, get rid of the stuff in your question that involves destroying the Pi with inappropriate voltages and edit in the output of lsusb with the converter plugged in. You will need to apt install usbutils if this command is not found.

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