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January 10, 2008
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about 4 years ago
Be good to mention about DTE and DCE terms when taking about TX and RX lines.<br />
On Data Terminal Equipment (DTE) the TX line is an output (transmitted data) and RX line is received data (an input). <br />
However on Data Communications Equipment (DCE), like a modem or radio modem, the TX line is the transmitted data (an input) and the RX line is received data (an output). This is often not the case in all modems and it can be quite confusing. <br />
So TX and RX don’t indicate if a line is input or output, when its a good ideal to mark the lines as an output or input.<br />
In RS232, when you connect a DTE to a DCE your connecting the TX line to a TX line and RX to RX, just to confuse things.
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