Hello, I found this display on an all in one pc Display once used as a cash register and have 3 of them laying arround they seem high quality and definitely still work, I am not really a professional when it comes to arduino because i started using them since 2 months but i really want to use them as simple displays for stats but i have no idea how to talk with them i already searched online but did not find useful information, they have an RJ45 cable with 8 copper connection which just plugged on a dedicated slot on the back of the register,
thanks in advance
Right next to the connector there appears to be an RS-232 tranciever chip. That suggests that you need to use a serial port to talk to the chip, and that you need proper RS-232 voltage levels for it.
Most likely the 8 pin cable supplies power, ground, and RS232 Rx data. There may be Rx-232 Tx data from the display, and a couple of handshake lines as well.
I would suggest an Arduino with a second serial port and a tranceiver chip like the MAX232 to handle the voltage level shifting. You will have to figure it the data rate, but it's probably going to be one of the standard ones. Try sending 'Hello World' to the display at different speeds until you get a response.
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Some VFDs contain a small amount of cadmium in the phosphor and lead in the solder. When discarding VFDs or VFD-modules, please adhere to governmental related laws or regulations.
(Note: RoHS-compliant products do not contain cadmium)
https://www.ebay.com/itm/325314277223
https://www.mouser.com/c/optoelectronics/displays/vacuum-fluorescent-displays-vfd/
https://www.mouser.com/datasheet/2/921/Futaba-06-11-2019-Futaba_VFD_Modules-1602274.pdf
https://os.mbed.com/users/wim/notebook/vacuum-fluorescent-display-vfd-drivers/
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