Marine Electronics Forum - Raymarine

Can anyone tell me what the crossover coupler does? I have an e120, dsm300, p66 ducer, and an analogue radome.

I am getting signal and bottom on my first test of the dsm, but all of the posts I've read say I need this thing. I don't care about the additional 30 bucks with what I already have invested I just want to know what it does and why I need it.

Also, the crossover coupler is required when connecting an E-Classic directly to a DSM. The coupler is not required when using the multi-port switch. It's needed because you need to (here it gets only slightly geeky), cross two wires from one cable to the other. Think of it like you have to put the "send" on one cable to the "receive" on the other.

Bottom line, if you have an E120 classic (and I believe you do if you have an analog radar), and a DSM, and THAT'S IT for SeaTalk HS (the ethernet connections), you MUST have a crossover coupler to make it work.

I'm not disputing any of your points, but my unit is a classic and it's working now?? Is it just now working to capacity?

Broom, if it's working, you're good. If it wasn't working, and you don't have a coupler or SeaTalk HS switch, that would be the first thing to do.

Now, if you DON'T have a switch or coupler, you MIGHT have a "crossover" cable that takes care of what the coupler would do. Without seeing exactly what you've got, and how it's connected up, I can only speculate.

So you've got it going on, and my recommendation would be to not F--- with it.

So here's another stupid question... Do I need another hs cable to make the final connection?

What "final" connection?

Now I'm REALLY confused. I thought you had it all connected and working. You said in your original post that "I am getting signal and bottom on my first test of the dsm..." How do you know that if the DSM isn't connected to the plotter somehow.

Can you list what components you have, and how you have them connected (i.e. SeaTalk, SeaTalk HS, NMEA 0183, etc.)?

I was referring to another cable to go from the crossover to the e120.

This is my current setup

E120 classic
Ray star 120 wired by seatalk/ alarm cable
Analogue radar wired direct
P66 ducer wire to dsm300
Dsm300 is then connected to the e120 by seatalk hs. At this moment with this configuration I have bottom, depth, but it has only been at m slip so no marks and no temp

So as I read this, your DSM is directly connected via a single cable (stock Raymarine cable?) to the E120. If that is the case, I'm surprised the DSM is displaying. The E120 requires a crossover connector if being directly connected to any other SeaTalk HS device (including another E120). By all rights, you should have two Raymarine cables (with the locking collars - one for the E120, one for the DSM) meeting in the middle in a crossover coupler.

Not sure why you aren't getting temp on your display. Sitting in my slip, I get temperature just fine. It could be that the "thermister" in your transducer is gone. But when mine have fried, the temp reading usually goes wacky high.

There's a gentleman named Tom Surran (sp?) here from Raymarine that might jump in and offer his opinion.

Joe

Would love to hear from him

I just went through the same thing with my E120W and the DSM300. For me the bare RJ45 connector does not actually "click" into either the DSM or the MFD (Multifuntion Display). So you need either one raymarine cable with the watertight connection on each end (Picture B) or two raymarine cables with the watertight connection and a bare RJ45 (Picture A) plus the crossover coupler (PIcture C) to make the connection watertight and secure on both ends. With the single cable it is pretty self explanatory, plug each one into the correct port on the two devices, and ensure you have tightened the watertight connector. With the two cable/crossover option you plug the water tight connectors into each device and then join the cables at the crossover coupler with the bare end of each wire.

The reason for doing it one of the two ways listed above is for the obvious reason of keeping moisture out and having a secure connection. When I tried to plug a bare RJ45 into my DSM it worked but the connection was not tight so the connection was hit or miss, and the second I hit a boat wake or wave I lost connection with the DSM.

For the temperature issue, ensure you go into the settings menu and select the correct transducer for temperature. It doesn't always recognize the transducer that is plugged in and you have to select it. If that does not fix the problem, you may have lost the temp sensor on the ducer. Hope this helps.

Picture A
http://www.thehulltruth.com/members/tuna_maniac-albums-raymarine-picture59528-ray-watertight-one-end.bmp
Picture B
http://www.thehulltruth.com/members/tuna_maniac-albums-raymarine-picture59527-ray-watertight-dual-end.bmp
Picture C
http://www.thehulltruth.com/members/tuna_maniac-albums-raymarine-picture59526-cross-over-coupler.bmp

So if I understand correctly the sole purpose of the crossover coupler is to be able to utilize the watertight connection at the dsm, and has nothing to do with data tramsfer?

the couplers sole purpose is to connect two Raymarine cables that don't have the watertight connection on both ends. Ie if you can't pull the water tight connection through the run you have in the boat but you can pull the cable with just the RJ45 connector.

understood. thanks for all of your help everyone.