Pin 1 is the serial input and shouldn't be left unconnected. By default the M12 doesn't talk on the serial line: you must give a command and get the answer. There are commands to program the M12 to talk on the serial port every n seconds. First get the manual (there are many in the wild) for example: <www.jackson-labs.com/assets/uploads/main/Motorola_M12.pdf>.
On Wed, Jun 11, 2014 at 6:04 PM, Stephen <[email protected]> wrote: > Hello everyone, > > After reading quite a bit from your archives i've decided to try a put > together a 10MHz reference. > > I've picked up a oncore M12+T GPS card and have tried to initialise it but > without any success thus far. > > The user manual for the M12+T seems to suggest that i should be able to hook > the txd and rxd pins to a MAX3232 and be able to use the Winoncore software > to configure the card. > > At power up the M12+T pins 1 & 2 are at 3V. After 10 seconds pin 2 sinks to > 0V, pin 1 idles at 3V and pin 4 give 1PPS. No serial output from the card at > all. > > Anyone have experience of connecting an M12+T to rs232? > > Stephen > _______________________________________________ > 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.
