There is no pin for synchronization. The RS-232 serial protocol has a start and stop bit, logic 0 and 1 respectively. An idle channel will have a logic 1. So if the channel goes from idle to active, 0 will be the first thing you see. Drajver dlya lpt porta windows 7 10. If you pick up the channel in the middle of transmission you'll end up having to find the pattern of 10 repeating every 10 bits (8-bit data). I actually don't think anyone does that type of synchronization.

8 Bit Serial To Parallel Converter Verilog Code

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From observation of devices that used RS-232 to receive data, I always remember seeing garbage if you hooked it up in the middle of a burst of data. I think most devices need a pause before achieving synchornization.