The standard allows a manufacturer to define its own proprietary sentences. These allow more functionality but are unique to each manufacturer. This is followed by a 3-letter manufacturer ID and a 1-letter sentence identifier.
NMEA instruments have serial ports. With a suitable cable they can generally by plugged into the PC's RS serial connector. Software like Windmill can then collect and interpret the data being sent from the instrument to the PC.
Some manufacturers may use non-standard cables and plugs. It is often easiest, therefore, to buy the cable from your instrument supplier but you can make or modify your own. Issue 42 of Monitor gave details on RS connections. You will need to tell the data acquisition software about the communication settings your instrument is using. After connecting your NMEA devices to the computer you need some software to capture the data and save it in a file. The free Windmill 4. Windmill also lets you chart data and export it to other programs like mapping packages, spreadsheets and databases.
When using Windmill you have to specify how to parse the data sentence, storing each type of data in a channel. For example, with our sentence. When using an Excel spreadsheet for analysis or display, how do you control where the line break appears in a cell with a long text entry? This really helped me. Thanks Panbo Thanks Panbo. Does anybody know if Garmin series has this capability that Furuno has?
I know from an inside source that you can hook the Garmin up to a regular ethernet but my source was somewhat vague as to what you could actually do with the data. I have a laptop set up with Nobeltec and wired ethernet in the boat, so in an emergency it would be an easy matter for me to hook up my backup GPS puck and radar.
I like the diagram. I have some of my system but it is not very cool. It might be interesting, however, if Panbo had a place for people to deposit diagrams like this. It is helpful. But the data is generally not accessible to anything else. But this choice is used in the next step. I spent 5 weeks on the water last year with my original configuration, and never knew about that User Setup menu. Did not really need it either, but that was what I had to search for to figure out how to switch back and forth.
Have to ask the Rose Point folks. Thanks, Bob. Frankly, my understanding of UDP is pretty shaky. The plotter can be in the pilothouse and the radar display can stand alone. Personally, I prefer to set the AP to a desired course and NOT to integrate with the plotter as I believe this is an accident waiting to happen and makes the watch lazy. This is a great discussion, by the way. For example, IP provides an unreliable service. All these protocols use packets, but UDP packets are generally called datagrams.
Anything on Ethernet is accessable, but you have to figure out how to decode it. Ideally, Furno and Garmin et. It might make a nice way to extract some extra revenue from the product for little up-front cost. In general the local Ethernet card will do its best to ensure that a UDP datagram handed to it is sent.
Since all networks now use switches instead of hubs there are no packet collisions. The switch will queue up the packets from all senders and send them out to the receivers. It is an unfortunate name; TCP sockets are arguably more reliable than the CAN-based throttle control in your Toyota… The Ethernet was designed to allow command and control decisions to be made across the country in the aftermath of a nuclear attack. Remember when we worried about those? It is theoretically designed to deal with worst-case scenarios like trying to send a message from New York to California given that Chicago gets wiped out during the transmission.
Rest assured that if this happens, your YouTube videos will continue without any noticable hitch. It is way overdesigned for something as simple as a boat network. It was frustrating to see people speak owlishly about collisions, network bandwidth, and non-guarenteed reception when talking about the virtues of NMEA vs Ethernet. None of these are even remotely issues with modern ethernet. The thing was designed to work reliably when baud modems were the hot telecoms device, with mbps networks it is almost inconceviable that you will ever even see a packet collision on a boat — even if you are watching a YouTube video from New York!
NEMA is tolerant of missing a frame or two and few if any would ever get lost anyway. The first European presentation was at Mets and the feedback from the visitors where absolutely overwhelming.
Magicplex 8 was one of the few high lights of this exhibition. The technical parameters of the product are top level international leaders.
The equipment has 8 channels, which can be operated alternatively as input and output. All interface parameters are, of course, adjustable.
The data baud rate can be configured for each channel separately and can have different speed. All ports can be routed to a different port. I did some investigation yesterday, and the Nomadics Magicbus8 does seem very well designed for complicated NMEA situations though the yacht model costs about euros. There is no U. Great product! When will it be available? The MACC is programmed directly on the hardware - i. Its small size, weight, low power requirements and integrated heatsink make it an excellent candidate for solving airborne communications incompatibilities.
Before Ordering:. The MACC is a table driven Avionics translator that enables devices supporting different communications specifications e. We provide this service free of charge. The tables are then provided to the customer who may then edit them to change, add to, or refine as required by the project.
We also have experience with projects in which simple translation is insufficient and the MACC is tasked with initializing equipment on its own — without input data to guide it, or where special timing requirements or state machines need to be enforced not directly related to inputs.
We often can implement these requirements into the MACC thereby solving project specific issues at lower cost and lower risk that would otherwise be possible.
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