Hello

I also have GPS position on my NMEA network (provided by a SignalK instance), and VenusOS doesn’t see it. But it works with all other N2k devices on network.

Does VenusOS rely on some specific configuration to get position ?

Hi both,

Yes it does. See the GX manual for the requirements.

I can’t make any promises, but if you have a way to share details on how the position is on your network then I can list it for getting it amended on our side.

Hello,

Here is a short dump form N2k network containing 129025, 129026 and 129029 PGNs. Can you do something with that ?

root@pi4:~# candump can0 | egrep "F801|F802|F805"  
  can0  0DF80564   [8]  40 2B FF B1 4C 60 80 E1
  can0  0DF80564   [8]  41 15 C0 CA 57 A9 04 40
  can0  0DF80564   [8]  42 0E 06 00 D4 EE 87 C3
  can0  0DF80564   [8]  43 89 FD 00 FF FF FF FF
  can0  0DF80564   [8]  44 FF FF FF 7F 23 FC 10
  can0  0DF80564   [8]  45 40 00 FF 7F FF FF FF
  can0  0DF80564   [8]  46 FF 01 FF FF FF FF FF
  can0  0DF80264   [8]  FF FC AE 30 00 00 FF FF
  can0  0DF80164   [8]  FB 45 02 1A 22 F0 40 04
  can0  0DF80264   [8]  FF FC AE 30 00 00 FF FF
  can0  0DF80164   [8]  FB 45 02 1A 22 F0 40 04
  can0  0DF80564   [8]  40 2B FF B1 4C 80 CE E1
  can0  0DF80564   [8]  41 15 C0 CA 57 A9 04 40
  can0  0DF80564   [8]  42 0E 06 00 D4 EE 87 C3
  can0  0DF80564   [8]  43 89 FD 00 FF FF FF FF
  can0  0DF80564   [8]  44 FF FF FF 7F 23 FC 10
  can0  0DF80564   [8]  45 40 00 FF 7F FF FF FF
  can0  0DF80564   [8]  46 FF 01 FF FF FF FF FF
  can0  0DF80264   [8]  FF FC AE 30 00 00 FF FF
  can0  0DF80164   [8]  FB 45 02 1A 22 F0 40 04
  can0  0DF80264   [8]  FF FC AE 30 00 00 FF FF
  can0  0DF80164   [8]  FB 45 02 1A 22 F0 40 04

1) One USB port is changed to be “power only”
There are three USB ports in the Cerbo GX, and one has proven to be unreliable for use with a VE.Direct to USB cable or other data connections. We spent a lot of effort to make it work reliably, but that proved impossible – unfortunately. The other two do work properly.

The USB port affected is the one closest to the HDMI port. This new firmware version changes its function to “power only”: to power the GX Touch. The Cerbo GX manual as well as the datasheet have been updated with this new specification. Newly produced units will have a different marking on the product, to make it clear that that USB port is different than the other two.

Installations in which this port is now used, with for example a VE.Direct to USB Cable, will lose connection to that VE.Direct device. I fully understand how this can be very inconvenient, especially for remote installations.

Temporary work around for installations using that USB port

In case you prefer to change the wiring later, and keep a working system until then, here is what to do:

1. Revert to the previous installed firmware in the Settings -> Firmware -> Stored backup firmware menu. Now the USB port will work again.
2. Logging the VRM Portal won’t work yet. Normally, reverting to a prior firmware version does not cause an issue, but unfortunately this time it does. Only for Cerbo GX devices. Our support engineers will need to make a change in the VRM Portal after reverting to a version prior to v2.57. Without the change, no data will appear on the VRM Portal. To have that done, please contact your Dealer. They will need to contact our repairs department.
3. Finally, at a more convenient time, rewire the system and update to the new version. When required, the number of USB ports can be extended with a USB hub, refer to the manual for more information. As the issue causing an unreliable data connection is extremely rare, chances that you’ll have an issue while still using the port for a short while are very slim. There is no need to contact us again when doing the upgrade – only during the downgrade as explained in step 2.

I finally got my Actisense NGT-1 plugged in to my N2K network. I can see PGN 129025/1F801 messages (Position, Rapid Update) every 0.1 sec, and PGN 129029/1F805 messages (GNSS Position Data) every second, so the data is definitely on the network. The latter is a very long message. The former is just eight bytes:

I will take another look through the GX manual to see what I missed, but figured that this might be useful.

Here's one of those in a pretty format, courtesy of the Actisense Log Viewer:

Any progres getting gps to Cerbo GX from nmea 2000 device?