RS232 the same as serial port?

By LakeyDaKidd ยท 5 replies
Apr 28, 2009
  1. Does anybody know if a RS232 port is the same as a serial port?
  2. maleo1

    maleo1 TS Rookie

    Well, I think so. Just do some google image search on "Serial port" and see if that's you mean.
  3. Tekkaraiden

    Tekkaraiden TS Evangelist Posts: 997   +93

  4. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    RS-232 although stated by wikipedia above as a standard Serial port, is in actual fact a 25Pin older parallel (or old printer) connector

    Whereas the old 9 Pin Serial Ports (made especially for the old serial mouse) is also called RS-232

    Here's a pic:

    Click to Maximize

    When people say RS-232, I immediately think DB-25 (Pin)
    When people say Serial RS-232, I imediately think DB-9 (Pin)

    So which one were you referring to ?
  5. sol1109

    sol1109 TS Member Posts: 43

    A serial port can be many things 25 to 25, 25 to 9, or 9 to 9 with various options of male & female, DTE/DCE/Null.

    The term SERIAL is actually a description of fact that data is transmitted and received over two dedicated wires one bit at a time in series as opposed to the parallel printer port that contains 8 data lines transmitting data in parallel.

    The 25 pin standard was developed around early modems and many of the signal lines can be dropped thus simplifying the cable to 9 pins.
  6. kimsland

    kimsland Ex-TechSpotter Posts: 14,523

    Oh yeah it wasn't mouse, it was for modem. I had one of those once. (seeming that was all you could have at the time) Mind you the mouse was 9Pin Serial too :D
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