FAQ: easyAIS 2nd. Gen.
With the integrated multiplexer in our easyAIS it is possible to connect all external NMEA data sources with 4800 baud and to up convert these to 38400 Baud. With regards to the data source type there is no restriction.
Yes, all the NMEA and GPS input data with 4800 Baud are passed through and upconverted to 38400 Baud. (Together with the AIS Data)
If the red led is flapping, the EasyAIS is receiving telegrams. The range of AIS could be up to 20 – 25nm under good conditions. If no target is nearby, you will see nothing flickering and nothing on your plotter screen.
Yes, the data are passed through.
The typical result of the lower baudrate: For example if you have 160 targets (at the moment we know the Rotterdam harbour is the only one which has such a high number of targets) With 4800 Baud it takes about 40 seconds until you get all the dynamic data onto your display. If it is no problem for you to wait to receive the objects onto your display, you can use one port with 4,8 kB. But if you would like to have the objects in real-time you should prefer to use maybe a 2nd port where you can get the easyAIS NMEA data by 38400 Baud.
Both versions (A and B) of transmitters work on the same frequency and – what is more important – they use the same transmission protocol. The difference is the content of the telegrams – not how these telegrams are transmitted! Therefore: Our easyAIS is of course able to receive Class A and Class B data. No problem for that.
Summary: Of course, you can receive telegrams of a class B transmitter by an “easyAIS”!
Yes, data are passed through.
Yes, the latetest generation of the Navman Plotters are easyAIS compatible.
Therefore we can guarantee a 100% working for a cable length of 15m with RG 58. But as you know as better the cable is, as better the reception and transmission will work.
Unfortunately, your suggested way does not work. It is not possible to connect with an USB plug.
The reason for that: serial and USB use different levels for data transmission. Also Windows needs a driver for every USB connector.
The solution for you will be this: You solder a sub D-9 connector onto the cable. The connector goes into a serial<->USB adapter. And you attach this adapter into the pc. We can deliver a SUP D 9 pole connector and also an adapter.
Connection of the easyAIS to the pc: Please connect the white-orange cable with the pin 2 of the SUB D 9-pole connector (female) and the orange cable with the PIN 5 of the SUB D 9-pole connector. It is very urgent, that you take the right PINS. They are hardly readable at the plug, but they are signed. After that, please install the USB serial adapter on the pc. Then you can connect the SUB D 9 connector with the adapter.
Please note the interface must be configured correctly: 38400 Baud, 8/N/1.
Yes it works very fine. We are located near by the rhein-main-donau-canal, 9km distance and we do daily continuous receive 8-15 AIS objectives in the canal. The barger do not uses an other “AIS” as the navy. The method is standardized.
It is possible with a special telegram.
The Message 22 by the class B AIS can stop temporally the transmitting a base station of a coast radio station. (It also can switch the transmitting telegram from all 30s to f.e. every 60min or even longer, if needed). The class A transceiver on the ships can not do that. Class A sender can not manipulate a class B sender. But there are difference ECDIS-electronic chart display information systems (norm EN61174) on the commercial shipments which does join with the class A AIS by it can inhibit the class b sender via filter function on the ECDIS display
Both versions of transmitters (A or B) are working with the same frequency and what is more important, they have the same transmission-protocols. The difference is the content of the telegrams, not the way the telegrams are transmitted.
Therefore our easyAIS is certainly able to receive class A and class B data. So this is not a problem.