OK- lets assume that your GPS is the "master"..for data supply to
peripherals..and your VHF/DSC and PC are recipients... Unless your
software in the PC has interrogative features, you really only need
data in...The VHF/DSC only requires data in for broadcast of position
on Ch. 70...Some equip. by other manufacturers will have Tx+ & Tx-
and Rx+ & Rx-, but garmin uses ground instead of data -...So from the
Garmin, you would take the blue wire(usully blue on garmin but may vary
dep. on model)and a wire from ground to the terminal board...this
becomes your data "main" buss..then connect the "data in" wires from
the VHF to that point Then you would also connect the leads from your
DB9 (either direct to the PC, or in the form of an extension cable) to
that point as well, blue(Tx+ from Garmin) to DB9 pin 2 and ground from
the buss, to pin 5...if your PC does interrogate for data, add a wire
from pin 3 to the strip, and connect the brown (data Rx+ from Garmin)
to the corresponding terminal going to pin 3... this gives two way
communication from the PC to GPS, for transferring waypoints, or if,
say your software supports an autopilot...This is assuming your PC will
accept NMEA data as is without a conversion. Here is a link with some
pin-outs and a wiring diagram to optimize data processing via RS232, as
well as some good general info:
http://www.google.com/url?sa=t&ct=re....au/rs232.html
&ei=3kHPQ6HQF6v6YImy7ekK&sig2=Qlt1b75MMEr8lHGg65v4 ig
(GMDSS is actually the equipment required under SOLAS, The DSC-capable
radio is one piece of the required equipment on
vessels requiring SOLAS compliance, as well as EPIRB, NAVTEX, Irridium
sat"C", etc)
Regards,
makv