How to send the message to the Customer Display terminal in EPOS using Vb.net?

As i am developing program in vb.net for EPOS system, i want to know how to send the message to the customer dsiplay terminal.How to send the message to the Customer Display terminal in EPOS using Vb.net?
More than likely using an API or RS232, you need the protocol the Display Unit supports and then you can determine how you will send the codes to the display.How to send the message to the Customer Display terminal in EPOS using Vb.net?
What did you just say?? Use in vb.net?! Holler, why would you use in vb.net nowadays?!

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