> Because RS232 signaling is negative logic.
That's what I used to think, but somebody corrected me many years ago.
The data is upside down but the control signals are not.
>From https://en.wikipedia.org/wiki/RS-232
under Voltage levels
For data transmission lines (TxD, RxD, and their secondar
Udo van den Heuvel via devel writes:
> On 16-04-2020 21:15, Achim Gratz via devel wrote:
>>If so, you must use the clear edge of the PPS (flag2 1).
>
> Why is that?
Because RS232 signaling is negative logic.
Regards,
Achim.
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>> If so, you must use the clear edge of the PPS (flag2 1).
> Why is that?
Which edge you should use depends on the device and how you wired it up.
Most PPS devices are setup so you should use the rising/assert edge. If you
run it through an RS-232 level shifter, they contain an inverter so you
On 16-04-2020 21:15, Achim Gratz via devel wrote:
>If so, you must use the clear edge of the PPS (flag2 1).
Why is that?
Udo
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Yo Hal!
On Wed, 15 Apr 2020 20:21:20 -0700
Hal Murray via devel wrote:
> Gary said:
> > Then hang it off another switch.
>
> Care to suggest "another switch"?
Nope. I just turn them all on. Ask someone that cares.
> > but it does burn out SD cards quickly.
>
> From my initial message:
Udo van den Heuvel via devel writes:
> refclock nmea unit 0 mode 7 flag3 0 flag2 0 flag1 1 time1 0.0006 time2
> 0.260 baud 4800
Your time1 value doesn't make any sense. You should use the highest
baud rate you can configure on your device, if you need to stick with
4800 you must restrict the
On 16-04-2020 11:31, Hal Murray wrote:
>> I could switch to a NMEA clock sans PPS and a dedicated PPS clock?
>
> That's what I would try.
So I went to:
##NMEA zonder PPS
refclock nmea unit 0 mode 7 flag3 1 flag2 0 flag1 0 time1 0.0006
time2 0.260 baud 4800
#
## PPS van dezelfde NMEA GPS
refc
> I could switch to a NMEA clock sans PPS and a dedicated PPS clock?
That's what I would try.
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On 16-04-2020 00:55, Hal Murray wrote:
>> So no error messages about gps/NMEA.
>
>> NMEA(0) .GPS.0 l 15 64 377
>> 0. 0. 0.0019
>
> What's the line for that in your ntp.conf? Any fudge lines?
driftfile /var/lib/ntp/drift
nts key /et
