I have a custom POS system in PHP (on a remote server), which requires displaying the price on a Pole display device, which is connected through com port (on the local PC).
I want a way to access the local com port from a remote server.
Is that applicable?
You can buy a serial over ethernet device which will convert the serial stream to TCP/IP in both directions. Then you can use a socket in your PHP/server side to talk to it. I have had good luck with Lantronix devices. http://www.lantronix.com/device-networking/embedded-device-servers/?tab=0