Did you ever solve this? Just so you know Raymarine calls ethernet "Seatalk." Yes, they have 10 and 100Mbps ethernet. The physcial layers are all standard ethernet (because it is cheap and works). So. how do they make it proprietary you ask? Simple, the headers are modified. The network uses unmanaged switches just like most home networks. So what do you have to do to get devices to communicate? Some of them may be Seatalk, others Seatalk II, others yet Seatalk hs. Begin to sound familiar? You need to use the appropriate crossover between two devices. If there are more than two devices you need a switch. What does the switch do? Exactly like the one at home it auto-senses the transmission rate and switches accordingly for each network line.
Need more info on what to use?
Raymarine Marine Electronics - SeaTalk HS Networking
I have used the converter box to allow introduction of NMEA data to the Raymarine system. Find that here:
I think there should be no mystery here except why didn't Raymarine tech support or your local installer help you with this?
In doing a little more research I found this post on another site:
"I have a DSM 300 connected to an E120 and all works fine. I'm using a standard 4-port switch rather than the extortionately priced Raymarine branded one. If you don't use a switch, then you need a cross-over cable or coupler. My switch is not IP rated, but then its in a protected location. The HS cables are indeed standard CAT5 (shielded variety) cables. The only thing I found was that I had to use Raymarine-specific cables (the shortest/cheapest I could get) for the connections at the DSM300 and E120 and then use ordinary CAT5S cables for the longer runs (connected to the Raymarine cables with standard CAT5S couplers). There is something odd about the sockets in the Raymarine units which means that a standard CAT5 plug doesn't seem to seat correctly; perhaps this is what you're finding?" JerryHawkins Quoted
"well everything works now and the 'trick' is to use Raymarine ethernet cables !
the "Screw in" end on the plotter and DSM300 doesnt make any contact with normal RJ45 cables, it does work with the proprietary Raymarine cable." ReneJK quoted