The instructions that came with the cable indicated an opposite polarity and we had to reverse to the above to make it work. We connected thetwo wires to the NMEA slots in the Raymarine connections block red to theNMEA positive (+) and the orange to NMEA negative (-) ports. The OpenCPN program outputs a NMEA signal on the red wire #3 and the orange wire #4. Their partnumber: USB-RS422-WE-5000-BT Description Cable Assemblies USB to RS422 Embedded Conv Wire End 5m The cable has a USB Dongle on one end with a built in chip that converts the computer output to a variety of signals depending on the program in use to the nine bare wires at the other end. Main St Mansfield, TX 76063 800 346-6873 Mouser part# 895-USBRS422WE5000BT The cable is from Future Technology Devices International LTD. I had the USB cable purchased for $47.50 from: Mouser Electronics 1000 N. My boat is equipped witha Raymarine RL 80c chart plotter connected to a Raymarine ST5000 Autopilotbut I think the following will work on any auto-pilot that accepts NMEA input. I was finally able to connect the OpenCPN output to control my auto-pilot with the help of Island Marine in Ft Pierce, FL.
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