Question LED sign with unknown model, no USB

SeekNDstroy

Reputable
Oct 2, 2016
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4,510
Hello
I need help with this LED sign i got, i have to program it so there is a different text. The cables that come out of this old thing are: normal power cable, a RS232 cable and this weird silver cylinder. Obviously, i don't know much about this but i figured i needed a usb to serial connector (or a usb rs232 adapter?) so i can connect it to my pc. But another problem is i have no software for it since i dont know what model exactly this is.
Any idea what i could do?