[aprssig] RS232 sniffer

Andrew Rich vk4tec at people.net.au
Fri Feb 15 17:19:20 CST 2008


I am thinking of putting together an RS232 sniffer for the shack.

Pretty simple, just some LED's for activity.

What would be the best way ?

Can compartors be used to show activity ? I am looking for lots of them ,
hence lots of pins to watch.

We have break out boxes, but they never really seem to have all the
connections we want, for a CRO etc

Ideas ?

A circuit to switch on with a +1.2 or greater volts

Not sure what to do about the -ve swing. or even bother - activity is the

MAX232 only has 1/2 in it what I want to do

Andrew Rich VK4TEC
vk4tec at people.net.au

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