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EIA-232  (Formerly "RS-232") The most common asynchronous serial line standard.  EIA-232 is the EIA equivalent of ITU-T V.24, and V.28. EIA-232 specifies the {gender} and pin use of connectors, but not their physical type.  RS-423 specifies the electrical signals.  25-way D-type connectors are common but often only three wires are connected - one ground (pin 7) and one for data in each direction.  The other pins are primarily related to hardware handshaking between sender and receiver and to {carrier detection} on modems, inoperative circuits, busy conditions etc. The standard classifies equipment as either Data Communications Equipment (DCE) or Data Terminal Equipment (DTE).  DTE receives data on pin 3 and transmits on pin 2 (TD).  A DCE EIA-232 interface has a female connector.  DCE receives data from DTE on pin 2 (TD) and sends that data out the analog line.  Data received from the analog line is sent b
 
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