To make this clear,
here is the example: I have 8 slot ( A0-A7). when the metal runs on that slot, it detect and produce an output such as red LED. Ok now, I want the output can be read to rs232 and can be display in vb panel.
My problem: Is rs232 can read of each slot I made? If only 2 slot (A0 and A5 as example) I put a metal on it, so only 2 slot per 8 slot will be detected as red led. Can rs232 recognize the slot clearly? How to connect between the output of metal detector (red LED) and the Rs232 connector..