how to connect 8251 ?

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Specifically, DTR and DSR are part of the RS232 interface, they are for handshaking with another device connected through the serial interface. They do not connect to the host processor. Normally they would be converted to/from V24 levels in the same way as the TXD and RXD signals.

DSR = Data Set Ready. DTR = Data Terminal Ready.

Brian.
 

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