We can read that port at the command line interface-CLI-with cat /dev/ttyUSB0 and see the NMEA 0183 ASCII sentences but not the Ethernet stream. It is recognized by the laptop and connected to ttyUSB0.
We have a Gigaware 2603487 USB-A to Serial Cable. (I added the code to do that to Wireshark when I was using the Mac in question. (The adapter on a Mac I used many years ago did I dont think the adapters in current Macs do.) Wireshark attempts to guess whether an Ethernet packet has an FCS and, if it thinks it does, handles it as such. We have not touched the boat wiring, but have lost the cable and necessarily moved the software to a new laptop ( openSUSE Leap 42.1 Linux) that does not have an Ethernet socket, only USB.ģ. At least some adapters might, however, supply the CRC/FCS. We did have a Serial to Ethernet cable that connected to an older laptop running the software that had an Ethernet Socket. The bridged data are wired to a DB-9F chassis connector near the laptop. We have a piece of boat gear (RayMarine C120W) that bridges NMEA 0183 (ASCII) and EtherNet ("SeaTalk-HS") data for transmission to Windows software (RayTech Navigation System-RNS).
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