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

Scott Stobbe scott.j.stobbe at gmail.com
Thu Nov 3 13:26:28 EDT 2016

The signals on the DB9 connector are at RS232 levels, your GPS module is
likely 3V3 CMOS, you will need to make a level translator if you wish to
use a standard PC RS232 serial port.

On Thu, Nov 3, 2016 at 12:58 PM, STR . <strykar at hotmail.com> wrote:

> Hello again list and Paul,
> The USB and Mini-PCIe converters I ordered from Ebay China have not shown
> up
> yet.
> It appears PC Engines may take a while to release the custom BIOS that
> exposes UART3 and 4 on the APU2  :/
> In the interest of getting this working without waiting on a BIOS I will
> try
> connecting it to COM1, which is wired to the DB9 connector.
> https://pcengines.ch/pdf/apu2.pdf
> Before I fry a 3.3V board with 5V signals, I hoped to ask here and confirm
> my ideas.
> Do I cross RX and TX lines from the GPS pins to the RX/TX on the DB9/COM1
> connector?
> And straight connect the PPS line from the GPS to the DCD pin on the
> DB9/COM1 connector?
> GPS:
> http://pcengines.info/forums/?page=post&id=B4D54F22-8224-
> 4A67-9F9E-85F988A1F
> 888
> Thanks!
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