TTL Model: CP2104 Fact: TXD: the sending end, generally expressed as their transmitter, normal communication must be connected to another device RXD. RXD: the receiving end, the general said to own the receiving end, the normal communication must be connected to another device TXD. Normal communication when the TXD itself never connected equipment RXD! Since the resumption of spontaneous TXD RXD connected with other equipment's normal communication, so if you want to receive their own to send data as the name implies, is receiving his own transmitted data, namely, its TXD is directly connected to the RXD, used to test itself to send and receive is normal, is the fastest and most simple test method, when problems arise first do the test to determine whether a product malfunction. Also known as the loopback test.
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