capturing Serial Port with pcap

[Paul B. <apl21042 () verizon net>]

Hi,

I need to simultaneously observe the timing of ethernet traffic and a discrete 
control signal. For the discrete signal, I was thinking that I could tie the 
signal to a control signal such as CTS or RTS on the serial port and modify 
the serial port driver to send a character or maybe a known PPP packet when 
the discrete signal changes. Then, pcap would timestamp and capture both the 
real ethernet packets and the PPP packet. Does this make sense?  Has anyone 
done anything like this? Assuming RedHat linux on a relatively new PC what 
kind of timestamp resolution might one expect?

    Thanks,

     Paul

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