However, having said all this, I must now admit that I have a lab
    FULL of measuring instruments hooked up via 3-wire RS-232, mostly
    because whoever wired their internal RS-232 jacks had some really
    "interesting" ideas about flow control.

You shouldn't REALLY need flow control until the inherent data rate of the
receiving device drops below the transmission bit rate.  This can happen on
things like printers (carriage and paper movement being much slower than
data reception), and happens all the time on modems that are "optimistic"
about the level of compression they think they can achieve (115.2kbps for
4x+ compression on a "38kbps" comm channel.)  For other sorts of devices,
you might as well just turn down the bitrate until you don't need flow
control any more (and/or complain to the vendor :-)

BillW

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