[time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

Hal Murray hmurray at megapathdsl.net
Wed Nov 9 00:13:05 EST 2016


strykar at hotmail.com said:
> Would this do the trick? - http://www.banggood.com/8-Channel-Logic-Level-Tran
> slator-Converter-Bi-Directional-Module-p-1023173.html 

Not likely.

The normal RS-232 level shifter chip includes an inverter.  (No good reason, 
just historical, but with a long history.)

I can't understand the schematic on the part Gary suggested.  I'd use 
something like this:
  https://www.sparkfun.com/products/11189


-- 
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