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Old 29-08-2016, 21:02   #1
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gradar cablling

I know the existing Ethernet cable from the scanner to the chart plotter is a crossover.
I am adding OpenCPN and setting up like diagram.
are all the cables the same?

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Old 30-08-2016, 08:18   #2
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re: gradar cablling

Won't the power also go back through the switch?
What do you think will happen inside the switch?
And your PC for that matter!

I think I'd pull the Pin 5 wire out of the plug and send the power to the Garmin Radar separately, but I am no electronics guy.

Have you seen Bdbcat's diagrams? You should find them on opencpn.org under External Plugins or search Gradar.
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Old 30-08-2016, 09:30   #3
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re: gradar cablling

Gradar was my first search, cabling was my second. the 1st image is from the Gradar setup manual. but it doesn't say weather the cables are strait or crossover.
p.s. I did find a much cheaper solution to the MJR-5780-01 connector. at $2.95 ea. it's much better than $19.00ea. from digikey.

Coupler, Cable, RJ-45 Jack to RJ-45 Jack | MPJA.COM

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Old 30-08-2016, 10:31   #4
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re: gradar cablling

artiisanmach...

All the cables are straight-thru, no crossovers.

Nice find on the lower cost RJ coupler. That'll work

Good Luck
Dave
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Old 30-08-2016, 11:08   #5
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re: gradar cablling

Thanks Dave
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Old 30-08-2016, 11:40   #6
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re: gradar cablling

I've seen those RJ45 couplers before. I could use one if I were to cut the B&G Network cable at the Chartplotter, instead off finding a socket that fits... I'd rather not though.

What is the decision on the Powered Pin 5? Is it going to blow up the switch or wipe out your computer?
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Old 30-08-2016, 12:13   #7
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re: gradar cablling

Rick...

How is Pin 5 powered? The Garmin Radar has separate power input leads.

??
Dave
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Old 30-08-2016, 12:56   #8
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re: gradar cablling

ArrtisanMatch in Post #1 has a diagram

http://www.cruisersforum.com/forums/...6&d=1472529430

which has pin #5 powered (and switched).

=====
I believe he is getting the BR24 / Navico 3G/4G / Simrad / B&G
Broadband Radar mixed up with Garmin and Garmin HD, but I don't know Garmin Radar Wiring.
However if he follows his diagram I think he'll damage his router and computer.
I hope I would never do that! But I am not an electronics guy.
====
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Old 30-08-2016, 13:36   #9
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re: gradar cablling

I copied the diagram directly from the gradar manual posted on openCPN site.
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Old 30-08-2016, 14:16   #10
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re: gradar cablling

Artisanmach, Can you give me link? I searchex but didn't see it.
I am curious about this. Thanks
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Old 30-08-2016, 14:53   #11
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re: gradar cablling

http://opencpn.org/ocpn/downloads/doc/GRadarDoc.pdf
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Old 30-08-2016, 14:57   #12
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re: gradar cablling

Rgleason, it took me a minute to find where I found it...
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Old 30-08-2016, 15:20   #13
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re: gradar cablling

Rick...

That is my drawing. I did it years ago.

Pin 5 is normally unused in modern 10-Base-T wiring schemes. Garmin has appropriated it for their power control. It is weakly pulled-up in the scanner, and a user supplied switch shorts it to ground to signal the scanner to power-up. Pin 5 carries no power current, only a weak signal current.

It may be that some other device upstream on a particular network also uses pin 5, but that would be rare. If worried about that, then just arrange so that the pin5 conductor is cut or disconnected in the upstream direction.

Dave
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Old 30-08-2016, 16:02   #14
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re: gradar cablling

Thanks Bdbcat and Artisanmach

The pdf serves very well even years later, and and what bdbcat wrote above explains it more ... its very low power!

Quote:
This functionality is provided by dedicated wiring in the Ethernet connectors on the chartplotter, and controlled by the chartplotter firmware. Unfortunately, it is not common for Ethernet hubs to pass through the required dedicated wiring pins on the cable, As a result, in an OpenCPN shared scanner environment, we must duplicate this power control wiring externally. Finally, we may additionally wish to implement a physical switch in order to control the radar scanner power independently from the chartplotter.
This part and what follows really has helped me understand what is going on.
Quote:
There are two protocols of interest; a) Control packets sent from the OpenCPN computer (or attached
chartplotter) to the scanner are transmitted to a specific fixed scanner address (IP) and port using UDP Datagram protocol , and b) periodic radar scan data and status reports from the radar scanner are transmitted systemwide by means of UDP Multicasting. This split of protocols is critical to the OpenCPN PlugIn, as it allow sharing of the radar scanner captured data stream. To enable this interface to the radar scanner, the OpenCPN computer must be appropriately configured for the
operational mode desired.
Thank you!

PS: I might add, that the Navico BR24/3G/4G radar has a "yellow" control wire which turns the radar dome on and that is norrmally connected to +12vdc. (I have the yellow "turn on" wire connected to the red wire from my Radar Breaker Switch.)

I don't think I would want to confuse the two different radars... and that is why Merrimac suggested and agreed that my diagram for connecting a switch or router for a Navico BR24/3G/4G was correct, because the yellow control wire does not have to go through the ehternet switch, as that is all handled by the RI10 Radar Interface Box. I had been dreading having to figure out the making the ethernet connections at that box, and I do not have to now! See this System wiring schematic.

http://www.cruisersforum.com/forums/...8&d=1472410701
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Old 31-08-2016, 10:57   #15
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re: gradar cablling

Note that Gigabit Ethernet does use all 8 wires, so YMMMV when you wire up Garmin equipment that uses pin 5 for something else to a Gigabit switch. Navico yellow only has 4 wires, those used for 100 Mbit Ethernet, so this never has this issue.
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