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Last updated: 716 day(s) ago (Sun Feb 24 15:01:33 2008) Tue Feb 9 05:08:14 2010

Serial Port Resource Page

New - sample code.

This page started as a collection of notes I have compiled over my twenty plus years of working with RS-232 and serial ports of all kinds from VAXes down to Intel based desktops.

The RS-232-C (now known as EIA-232-E) specification has been around since 1977 and is based on level +/-5vdc signals. EIA-232-E is an asynchronus clock specification meaning that signals are sent irrespective of the clock of the remote device and consequently can drop signals by over or under-running the remote device. EIA-232's big brothers EIA-422-B (balanced) and EIA-423-B (unbalanced) are synchronus and require clock signals on pin 25.

For those that support serial ports or modems connected to serial ports I ihighly recommend the following:

  • A good understanding of the signals and how they "handshake" for flow control.
  • A "break out box", signal tester and possibly a BERT (bit-error rate tester).
  • A line analyzer might by quite usefull if you have to diagnose character losses or learn to configure a foreign device.
  • And finally a cookbook: "RS232 Made Easy" by Martin D. Seyer has been the defacto standard for many years.


    Notes:

    Using the serial ports under Linux.


    Resources:

    Greater Scroll of Console Knowledge

    Stokley Consulting Unix Serial Port Resources

    Conserver Users Mailing List

    Yahoo Group: Interfacing the PC


    Software:

    Conserver


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