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 . <[email protected]> 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! > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
