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SeaTalk NMEA Bridge128SD without display with USB
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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.
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).
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...
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 :-)
As with most NMEA devices, we have galvanic isolation on the NMEA
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.
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 ... :-(
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.
... I just sent the sources and schematics :-)
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.
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?
Wednesday 05 August, 2015
1856651 requests since Tuesday 04 April, 2006
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