You need to determine how to communicate with the Pole Display. So you need to know which Port it is connected to. You claim that it is a serial device, so it must be connected to a COM port (or COM-emulated USB). If your device manager is not giving you any hints (it should though, look around under each section), you can try this until you get a result:
Open a Command Prompt, and type the following commands until something appears on the Display:
It could be on COM57 for all we know, so keep going until you get something.
Further, if you have any type of manual, it should give you ESC/POS commands you can use to configure the Display, but we know nothing about your display other than what it looks like from the picture. Does it have a model number (not the POS, the Display)?
the till is a toshiba sta-10, and the pole display is built in.
the display is on com 4, i have tried this but still does not work.
i get text on the display but it is completely different from what should be displayed, they are more like symbols rather than letters.
i have team viewer set up on the till, are you able to log in and have a look at it for me?
if you can that will be very much appreciated as i have been stuck for months now.