Seatalk???

[Time2Go]

Hi Friends,
Helping a friend sort out
his Seatalk network on a new to him boat.
1st question: What would be the purpose
of having 3 spur cables and two terminators
on a 5 connector block with the terminators
on each end? I don’t see how it could be part of the
network
2nd: Is there anyway to trace backbone and spur
cables? Can I send a signal from a disconnected
end and trace it somehow?
Definitely not in my wheelhouse with this
for sure
Thanx
Neil

[Frankly]

The network specifications call for a 120 ohm terminating resistor on each end of the network. Those SEATALKNG blue backbone cables are 4 conductor and drain wire. The white spur cables are 5 conductors and drain wire (the extra wire is to support old SEATALK).

I reckon you could consider the 5 way block a very short backbone. Blue network termination on each end, say display, autopilot, and 12V power on the remaining three.

Might want to consider future expansion in how the network is configured. Cables are reasonably priced and the unusual connector locking arrangement eases routing cables.

Tracing with a multimeter and small copper wires. Short two female contacts together, and then check the other end adding small extensions to the probes.

Frankly

[Time2Go]

Thanx Frankly
Makes sense, The confusing bit is here
is that there are two additional 5 port
blocks on the boat , each with a terminator
on one end with a backbone cable between them
and 3 spurs on each.
Therefor I assume that there are actually
two networks on the boat.
Next step for me is going to start tracing
cables and a full equipment list.
Thanx for the tracing tip
To early to give up
but anybody know a seatalk guru in SE Florida?
Thanx again
Neil

[NNBill]

Originally Posted by Time2Go

Hi Friends,
Helping a friend sort out
his Seatalk network on a new to him boat.
Neil

So everyone is talking apples and apples, Raymarine's first widely marketed networn was known as SeaTalk. When Raymarine came out with their version of NMEA2000, they called it SeaTalkng (pronounced SeaTalk enn gee). The link below is to a well written manual for Raymarine's SeaTalkng network. Two things to remember in any NMEA2000 network, it must have two terminators on the backbone, and it requires their own 12 VDC feed, whether you have two drops or 200 drops on the network.

Hope this helps, Bill.

https://www.jgtech.com/pdf/SeaTalkng...0manual-EN.pdf

[smac999]

If it does have 2 backbones (odd). From different screens you can read the device list of everything on that backbone.

You might find 2 different lists.

[NNBill]

Originally Posted by Time2Go

Hi Friends,
Helping a friend sort out
his Seatalk network. Is there anyway to trace backbone and spur
cables? Can I send a signal from a disconnected
end and trace it somehow?
Neil

Fastest and easiest way of tracing the cables, do an internet search for "fox and hound tone". This will return Tripplett's inductive tone generator and receiver. These tools are great for all sorts of cable tracing. Front probe the female end of the cable in question, connect the "fox" to it and with the "hound" receiver you can quickly and easily trace the cable.

Bill

[Time2Go]

Originally Posted by NNBill

Fastest and easiest way of tracing the cables, do an internet search for "fox and hound tone". This will return Tripplett's inductive tone generator and receiver. These tools are great for all sorts of cable tracing. Front probe the female end of the cable in question, connect the "fox" to it and with the "hound" receiver you can quickly and easily trace the cable.

Bill

Thanx NN
Exactly what I was looking for
Preliminary Amazon search found many from
29.00 to100’s
Any recommendations? Less is better
but don’t want junk
Cheers
Neil

[NNBill]

If you're on Ebay, search for "bk precision 262 tone generator cable tracer". This should do the job for you.

[Time2Go]

I’ve traced and sketched the set up
as per the attached.
The top part in solid lines is a straight
forward AP set up.
What i’m struggling with is the
rest of the set up with the dashed lines
The closest I can come is a reference
in the P-70 manual as it being able
to accept dual data streams.
I’m a bit reluctant to start messing
with settings without more knowledge.
So is the P-70 listening to both the
EV1 Core and the A-98 plotter?
My friend tells me that he was able
to control the AP from the handheld
remote but that he never used the
plotter.
What do you folks thing is going on here?
Fox and Hound ordered
Cheers & Fair Winds
Neil

[Time2Go]

Bigger picture

[Frankly]

On the Seatalk to STNG adaptor block only the center connection (yellow) is allowed to be connected to old Seatalk devices.

My P70S only has one connector on the back. Looks like a backbone cable between the display block and one of the adaptor blocks and getting the only two terminations at each end, and only a single spur to the display would be a legit configuration.


Frankly

[Kelkara]

I would remove the dashed line from the P70 and replace the two middle terminators with a blue SeatalkNG backbone cable, and it will all look a lot more normal.


My P70 only has a single port on the back ... but it seems that raymarine do allow daisy-chaining of P70, ST70 etc instruments along a single spur using the second port, but they don't talk about it much in the installation guide ... their diagrams certainly never show one connected to two backbones like that.

[Time2Go]

Thanks Frank and Kel
while I am sure of the connections.
when i drew the diagram i didn’t have the exact
ports that the devices connected to.
just looked at my diagram again and am reasonably
certain that the RF base went to the center
connector, so the plotter and RF base are
swapped.
Be back on the boat tomorrow and
will confirm
Thanks again Gents
You guys are great
Cheers
Neil

[Time2Go]

Originally Posted by Time2Go

Thanks Frank and Kel
while I am sure of the connections.
when i drew the diagram i didn’t have the exact
ports that the devices connected to.
just looked at my diagram again and am reasonably
certain that the RF base went to the center
connector, so the plotter and RF base are
swapped.
Be back on the boat tomorrow and
will confirm
Thanks again Gents
You guys are great
Cheers
Neil

The RF base does indeed connect to the center
yellow connector
Cheers
Neil