[Oberon] monitoring an RS-232 interface.

peter_easthope at gulfnet.sd64.bc.ca peter_easthope at gulfnet.sd64.bc.ca
Sun Jun 15 10:43:08 CEST 2003

Here is a rather unusual problem.

I want to monitor the serial interface
of an external modem.  The approach I am 
considering is a generalization of that 
described in 
"http://www.oberon.ethz.ch/native/WebTrace.html" .
In this case we need to monitor both sending and 
receiving lines.  This will require a tee serial cable with 
the side branch dividing to two cables.  One of these 
side branches needs the send and receive lines 
crossed.  This special cable will be inserted between 
the modem and the server.  Then one "observer" 
machine can be attached to each of the side branches.

WIth this setup, one observer will monitor transmissions 
from computer to modem and the other will monitor 
transmissions from modem to computer.  Perhaps one 
machine with two serial ports is capable of monitoring 
both lines.  No doubt this would work with Unix but I 
have not tried running two concurrent V24 tasks in Oberon.

Is such a technique described elsewhere?  Any suggestions
or improvements on my proposal?

Thanks,       Peter E.


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