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SeaTalk NMEA Bridge with repeater display and AluStyle housing
SeaTalk NMEA Bridge with repeater display and AluStyle housing
199.00EUR
148.75EUR
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I didn't read this section as I thought it was only applicable to Seatalk messages. But this is exactly what I'm looking for. I use a triducer Airmar DST800 (speed - depth - temperature) and I need to calibrate speed and depth in nmea, not in seatalk My previous nmea multiplexer had such option (in % for speed and value for depth), but it was always overflowing and configuration tool wasn't userfriendly.

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Thanks for clarifying. Btw, apart from the photos, you also missed the "2 NMEA 0183 outputs" text [url=http://www.gadgetpool.de/bestellen/catalog/product_info.php/products_id/93] on this page (below the first two photos).

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I actually think that even if the laptop is powered from the boat supply, there might be ground differences (my DC/DC converter that powers my laptop probably isn't really clean on its ground). At the very least you'd get a ground loop that could cause problems? Adding it for a next version seems like a good plan, especially since it seems rather easy - just power the FT232 from USB and keep its ground separate, then add two high-speed optos on the RX and TX lines? Now I'm doubting wether to get this multiplexer, or perhaps go for the miniplex after all. It's a lot of money to spend to run into problems later...

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Thanks for clarifying. I'm not sure if I actually need to filter/route seatalk data like that, but I didn't want to be stuck when it turns out I do. Having the sourcecode makes me not worry about this, if I really need it I could even hardcode it to get started :-)

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As with most NMEA devices, we have galvanic isolation on the NMEA-IN Ports. We also have a galvanic isolated SeaTalk Port. NMEA-OUT Ports and USB are not isolated. I guess it might be good idea to implement this in the future. If the computer is powered from a different power source ( Shore power ) , it might indeed result in ground loops between multiplexer and computer.

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There are 4 NMEA inputs and 4 NMEA outputs. In our first firmware releases, we only had 2 out ports. Meanwhile all 4 out ports are available. I have updated the manual, but not the photos. Sorry about that - I'll have to fix that ... :-(

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Well - i just have not made a filter for different seatalk sentences. Sure - could be done. I just didn't have the time and - up to now - nobody asked for it. What we have it a few diffentent configuration options. [img:9dbb911acb]http://www.gadgetpool.de/nuke/images/articles/multiplexer/SeaTalkOptions.png[/img:9dbb911acb] So you can switch on/off things like Seatalk -> NMEA - create and send a HDM sentence, when appropriate data is received from SeaTalk - create and send a RMC sentence, when appropriate data is received from SeaTalk - create and send a VLW sentence, when appropriate data is received from SeaTalk etc. NMEA -> Seatalk - create a SOG SeaTalk datagram, when appropriate data is available from NMEA. Since SeaTalk and NMEA data not allways come in the same structure, it would be a bit more difficult. We would have to think about how to set up a filter for this. Example : NMEA RMC sentence contains speed, position, heading, time, date - all in one sentence. In SeaTalk this information will be in different datagrams. You see. You can, to some degree, switch on/off creation of NMEA or SeaTalk sentences, but you can not filter to which port this newly created NMEA sentence should be sent to. It will be sent to all.

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... I just sent the sources and schematics :-)

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Just noticed a post in [url=http://www.gadgetpool.de/nuke/modules.php?name=Forums&file=viewtopic&t=246]this topic[/url] that says:
As with all gadgetPool marine products - sources will be sent out with each device shipped, and they are available on request.
So the answer to my question seems to be "yes, on request". I sent a request to the contact form, which might be better than through this forum.

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USB not isolated?

After looking at the specs again just now, I noticed that the USB port is not isolated. What's the reason behind this? Won't this lead to problems when connecting a boat-powered / grounded laptop? Or is the powersupply of the multiplexer itself isolated perhaps?

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