Re: [gpsd-users] gpsd:WARN: PPS TIOCMIWAIT returns unchanged state, ppsmonitor sleeps 10

[Hamish]

>>  > According to the manual it is TIA-232-F which according to wikipedia

>>  > is true rs232.  
Gary:
>>  Put a voltmeter or a scope on it.  I can count on one hand the number
>>  of people I have met that have actually read that spec.  Unless it
>>  explicitly says +/-12V you do not know.
Charles:
> I have also read that alleged spec. Everything is considered
> "advisory", including the notion that the people who wrote it could
> communicate at all. Nope, a scope or VM is the only way to go. Check it
> with the cable plugged in and unplugged.

fwiw, and I'm not sure which spec you're talking about here so please ignore if 
this is offtopic, but 2c from the back of my scratchy head- rs-232 is legally 
anywhere from +/- 3-25v either side of gnd, but I'd be careful sending more 
that ~12v to many consumer hardwares since who knows what corners they cut. in 
my experience most hardware uarts can deal with TTL level 0 | 5v (with hi/lo 
flipped vs real rs-232), but the addon serial adapters only support TTL 
sometimes, and GPSs often claim to output rs-232 but really output TTL. other 
times you'll need to whack something together with a max232 chip to do the 
translation from ttl to "true" rs-232.


regards,
Hamish