August 7, 2018  New model of our bi-directional gateway between NMEA 0183 and NMEA 2000

The new model of YDNG-03 has appeared to replace the old model YDNG-02. In addition to all features of the old model, it is certified by NMEA, supports more message types, has routing between RX and TX lines of NMEA 0183 port and offers a fast heading option for radar.

Routing between NMEA 0183 RX and TX data lines

The Gateway has one NMEA 0183 port with four data lines: two lines to transmit data (TX+ and TX-, multiple "listeners" can be connected) and two lines to receive data (RX+ and RX-, one "talker" can be connected). The port speed can be configured from 300 to 115200 baud.

The routing feature allows forwarding of selected or all NMEA 0183 sentences from RX lines to TX lines. For example, you have a depth transducer with a NMEA 0183 interface, wind sensor with NMEA 2000 interface, and the need to connect both to the NMEA 0183 port of your chart plotter. The Gateway can combine the NMEA 0183 depth sentences from RX lines with wind sentences converted from NMEA 2000 data, and send it to TX lines (see the picture above, left). This saves one NMEA 0183 input on a chart plotter.

In another case, you may decide to install a new NMEA 2000 wind sensor, but you have no free NMEA 0183 ports on your old chart plotter to connect a gateway from NMEA 2000 to NMEA 0183 and put the wind data on it. If you implement the YDNG-03 you don't need a free port; see the connection scheme on the right side of the picture above.

The Gateway supports bi-directional conversion of AIS, autopilot, waypoints and routes and other major data types of NMEA 0183 and NMEA 2000. The new YDNG-03 model also supports conversion of fluid level, battery status, engine and transmission messages of NMEA 2000, which has no corresponding sentences in NMEA 0183 (except the RPM sentence with engine revolutions and pitch, but many other engine data types like oil pressure or coolant temperature have no corresponding sentences) to $MXPGN and $PCDIN sentences with raw NMEA 2000 data. These sentences are supported in some marine software, including iNavx. They are also supported in all our NMEA 0183 products. The $PCDIN sentence can be converted in both directions.

The fast heading option (turned off by default) allows transfer of HDG sentence with 12 Hz frequency (80 milliseconds between messages) for using with radars. Note that this frequency practically consumes 4800 baud channel. Below is a part of a YDNG-03 log:

00:01:12.001 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.081 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.161 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.241 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 $YDHDM,99.9,M*06 $YDHDT,104.0,T*3A 00:01:12.368 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.448 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.528 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 $YDMDA,29.8577,I,1.0111,B,,C,,C,,,,C,,T,,M,,N,,M*31 00:01:12.689 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.770 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.850 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:12.930 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 00:01:13.010 T NMEA0183 $YDHDG,99.9,,,4.1,E*03 $YDHDM,99.9,M*06 $YDHDT,104.0,T*3A

The $YDHDG and $YDMDA sentences are 77 bytes in total, and at 4800 baud speed they require 77/480=0.16 or 160 milliseconds. And in the log above you can see that the next $YDHDG was sent 161 milliseconds after.

To use the fast heading at 4800 baud, you will need to turn off all other sentences or all long sentences at least.

To learn more about the NMEA 0183 Gateway YDNG-03, see the product page and User Manual.

The price of the new model is the same, USD $149. Models with SeaTalk NG and NMEA 2000 Micro Male connectors are in stock. Dealers started ordering model in June, and should have it in stock, too.

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 July 23, 2018  Tank Adapter for resistive sensors is released

We are glad to present an NMEA 2000 adaptor which works with any resistive level sensors and can work in parallel with analog gauges and the Volvo Penta MDI

Tank Adapter YDTA-01 (with SeaTalk NG connector)

Liquid level is a poorly measured value on many boats. A gauge can show 50% when a tank actually has 15%, and after a few seasons and multiple refueling, the owner forms a "corrections" table in his mind. Resistive sensors can show the liquid level with sufficient accuracy, but the problem is with analog gauges. Most boats have non-rectangular tanks, and the liquid level is not directly proportional to the volume.

What advantages are there from switching from an analogue solution to a digital one?

  1. True readings. Our Adapter offers 12-point calibration which is enough to describe any shape with reasonable accuracy.
  2. See it anywhere. Data will be available for all NMEA 2000 devices, and you will able to see the fuel level on MFD and instrumental displays. You can configure a page on your MFD to have all tanks on one page, and check all tank levels in a single glance.
  3. Usage history. The Adapter can record liquid level to the MicroSD card, but you can also use a recording device like our Voyage Recorder to store data from multiple Adapters along with all other vessel data.
  4. Remote access. If you have a Wi-Fi network with remote access on your boat, you can use our Wi-Fi Gateway to see all your tanks right from a browser or marine apps.
  5. Fuel alarms. A modern MFD can calculate time-to-empty and distance-to-empty values, display fuel range rings and warn when fuel level is low.

The best thing is that you do not need to get rid of your analog gauge. The Adapter can work in parallel with 2-coil (most popular) or 1-coil analog 12-Volt gauges and Volvo Penta MDI. It does not effect the analog gauge readings. If you have a combined gauge where you choose the value to display with a button, the Adaptor will smoothly work with it, too.

The Adapter can work with any type of sensor: European, US, Japan, and with any non-standard sensor with resistance up to 400 Ohms. The tank number (from 1 to 16) and liquid type (diesel, gasoline, fresh water, waste, etc.) can also be configured.

You can configure the Adapter in two ways. The Adapter is equipped with a MicroSD slot for firmware updates, data logging and configuration. You can save the current configuration to a text file on a MicroSD card, and upload new settings from a simple text file. This way does not require any equipment other than a laptop or smartphone with a card reader and text editor.

It can also be configured with special "Installation Description" strings. Some MFD's allow entering a text to device's properties. This text is usually used to save installation notes, the device location or the installer's contacts. You can also enter these strings with our free CAN Log Viewer software, connected to NMEA 2000 with the USB Gateway or Wi-Fi Gateway. This way allows you to sit on a sofa and set up multiple Adapters without needing physical access. The last version of the CAN Log Viewer has a dedicated window which displays data from a multiple tanks of any type.

The Tank Adapter is already certified by National Marine Electronics Association.

The Adaptor costs USD $149. Models with NMEA 2000 Micro Male and SeaTalk NG connectors are in stock. You can learn more about the Adaptor on the product page or download the Manual.

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 July 18, 2018  Engine Gateway's firmware update 1.21

With Yanmar 4JH series support, bi-directional message forwarding and support for custom engine transmission fault codes

Yanmar 4JH Adaptor Cable for Engine Gateway

We are glad to inform owners of Yanmar 4JH engines that we have tested our Gateway with 4JH45, 4JH57, 4JH80 and 4JH110. The engines report RPM, percent load, coolant temperature, oil pressure, battery voltage, motor hours and fuel rate. Several customers have already reported successful installations.

Your engine is also compatible if it is equipped with a B25 or C35 panel. Open the "System Diagrams" section of your engine's manual and check that it has diagnostics connectors "C" (SA-D), as it shown in red on this picture.

The 6-pin diagnostics connector "C" has a different type from what is used in Gateway. To connect Yanmar engines easily, we offer the Y-cable adapter for USD $29 (available in accessories on ordering page).

The new firmware update now offers bi-directional forwarding of specified messages, which can be turned on in the settings. The ability to forward messages from the engine's network to NMEA 2000 was added in 2017, and now we have added forwarding in another direction.

You may need this feature if you have a trip or fuel computer in an engine network that needs speed data from NMEA 2000 equipment to calculate fuel consumption. To forward speed through water (NMEA 2000 PGN 128259) and speed over ground with course (PGN 129026), add the following line to the YDEG.TXT file (up to 20 PGNs can be specified):


To learn more about message forwarding, see Sections VI.27 and VI.32 of the manual.

The next new feature is custom transmission alerts (SPN/FMI pairs). The Gateway has a built-in list of general engine and transmission alerts (like "Low oil level" or "High temperature", see the Table 2 in Section VI of the manual) which it maps to the status bits of an engine or transmission in NMEA 2000.

With the ALERT (see VI.10) and TRANS_ALERT (see VI.34) settings, you can map proprietary or specific for your engine fault codes to NMEA 2000 status bits.

The new firmware update is available on the Downloads page.

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