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Smart card PC emulator


timaco

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Thanks John, I was lost.

Timaco welcome to the community:
This circuit is dependent upon the device not sending and receiving at the same time. This is how half-duplex transmission works. I have seen quite a few manufacturers do this to save a few parts when full duplex is not needed for the circuit to operate.
Here is a link to a site that gives a very good explanation of the two communication methods with an illustration for a cable:
http://www.viddata.com/cables.htm

Hope this helps.

MP

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