Is there any other way to watch the signal to see if it's reaching the serial port correctly?

I would use my 'scope, but even an analogue voltmeter might work - see a regular flick of the needle. I built the equivalent of a simple break-out box into my two connections, one in the RS232 DB-9 plug itself:

 http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm#connect

Cheers,
David
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