With this adapter, the dAISy AIS Receiver can directly talk to chart plotters and other marine electronics. In addition, the integrated DC/DC converter allows to power it from your boat's 12-24V power system, removing the need for a USB power source.
This adapter was successfully tested with chart plotters (Garmin GpsMap 750s, Standard Horizon CP180i, Samyung N700), NMEA routers (vyacht) and RS-422 routers (Transas 4 port RS-422 to Ethernet). I expect it to also work with other devices that support NMEA 0183 or RS-422 input.
The adapter screws to the back of dAISy's enclosure. 3 wires need to be soldered to the main PCB for the electric connection:
If you don't have a dAISy yet, you can order a fully assembled unit on the dAISy AIS Receiver main page by selecting the NMEA adapter option.
If you already own a dAISy but don't feel comfortable with putting a soldering iron to it, please contact me by clicking the "Contact Me" button on the right.
On a technical level, this adapter translates one 3.3V-5V serial input to a 5V differential signal. This means, that it can also be used with your own DIY project in need of RS-422 output.
The differential output is driven by a Texas Instruments UA9638 transceiver. The yellow wire is the serial input of the transceiver.
5V power is provided through the red wire or from an external power supply. External power is regulated by a RECOM ROF-78E5.0-0.5 9-36V, 500mA DC/DC converter. When using external power, 4.7V will be present at the red wire, which can be used to power your project with up to 450mA.
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Nighttime tinkerer with a passion for small electronics and software projects that are measured in kilobytes.