[ntp:questions] Re: Garmin gps18: The best DIY gps refclock?
newsXXF.10.rmaeder at spamgourmet.com
Mon Nov 28 14:22:44 UTC 2005
Eugen COCA wrote:
> I was interested about how did you connect the PPS signal to the RS232
> interface, say the wardware configuration.
I simply connected the PPS wire (yellow) to the DCD (carrier detect) of the
same serial port that receives the data from the Garmin. You have to create
a link /dev/pps0 -> /dev/term/b, because the PPS refclock (#22) looks there
for the PPS signal.
the connections go like this:
Garmin RJ45 DB25f-Adaptor Sun DB 25
Vin Red 7,5 ws/br,ws/bl gn,br (+5V)
Gnd Black 8,1 br,ws/or bl,ws (Gnd)
PPS yellow 2 or or 8 DCD (PPS)
Gnd black 4 bl rt 7 Gnd
Tx white 3 ws/gn sw 3 Rx (in)
Rx green 6 gn ge 2 Tx (out)
ws=white, sw=black, br=brown, bl=blue, or=orange, gn=green, ge=yellow,
the power lines are not connected to the DB25, but to an external power
supply. The RJ45-DB25 adaptor is item 12.03.8030 from rotronic,
For setting up the Garmin, the DB25 is conntected via an adaptor to the DB9
port of a laptop running Garmin's SNSRCFG tool. This is also how I updated
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