Dont quote me on this, but I SWEAR (from questionable memory) that the pin that the data goes from the "puck" to the RTCM on is on the BOTTOM row, not the top (next to the PPS), so I would (off hand) say that you have your TX and RX reversed. Again, this is entirely from memory. I may VERY WELL be wrong. The best thing to do is try it. Jim Date: Sun, 21 Jul 2013 07:56:47 -0500 From: mhebert1975@gmail.com To: app_rpt-users@ohnosec.org Subject: [App_rpt-users] RTCM to GPS 18x LVC All, I am setting up a voter system using the RTCM and GPS 18x LVC. Has anyone used the Garmin GPS 18x LVC to interface with the RTCM? Here is the pinout I have. want to make sure it is correct. RTCM GPS 18x LVC 7 PTT Out <-- Pulse Output 1 Yellow 13 5Vdc --> Vin 2 Red 8 Ground Ground 3 Black 6 Rx Data <-- TX Data 4 White 8 Ground Ground 5 Black 14 TX Data --> Rx Data 6 Red Thanks, Mike - KD5DFB _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users