Brian Guralnick wrote:
Hi,

    I was wondering what the pinouts of a peripheral's female RS-232 DB9 connection.  
Basically, a device to be controlled by a
standard PC.  I'm having a bit of a conflict concerning the crossing of the RX & TX 
lines.


      The standard RS-232 connector is a 25 conductor DB-25, although
        many PCs (and some other equipment) now use a 9 pin DE-9 (often
        incorrectly called DB-9)

        Serial Port Connections
        Computer (DTE)                              Modem
        DB-25   DE-9   Signal          Direction    DB-25
          2      3    Tx Data             ->          2
          3      2    Rx Data             <-          3
          4      7    Request to send     ->          4
          5      8    Clear to send       <-          5
          6      6    Data Set Ready      <-          6
          7      5    signal ground                   7
          8      1    Data CarrierDetect  <-          8
         20      4    Data Terminal Ready ->          20
         22      9    Ring Indicator      <-          22


(stolen from my NMEA-0183 FAQ)



-- Peter Bennett TRIUMF 4004 Wesbrook Mall, Vancouver, BC, Canada GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html





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