This adapter is an upgrade for existing customers of dAISy. If you don't have a dAISy yet, we recommend buying the dAISy 2+ which already comes with NMEA 0183 / RS-422 output built-in.

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.

Specification

• NMEA 0183 / RS-422 output at 5V
• NMEA high speed (38400 baud)
• NMEA low speed (4800 baud) supported with dAISy firmware 4.07 or higher
• Powered from 9-24V or through USB
• Drawing approx. 25mA additional current

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). We expect it to also work with other devices that support NMEA 0183 or RS-422 input.

Basic soldering skills required for assembly

The adapter screws to the back of dAISy's enclosure. 3 wires need to be soldered to the main PCB for the electric connection:

• Black to GND
• Red to 5V
• Yellow to TX

Ordering fully assembled units

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.

Use as generic RS-422 adapter

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.