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In the case of the DTN box sensing the load on it's serial port, you could get
around this with electronic buffer amplifiers on the send and receive lines of
the RS-232 port (lines 2 & 3). The buffers would look like a single load to
the DTN box, just like using an amplified splitter on your TV cable. I
suspect the "slave" computer will have to be as fast or faster than the master
computer, with only the master computer's flow control lines connected to the
DTN box.
Walter
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