[CA] [CA11] No Drive Detected

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum harmspjf,

The reported issue is indicative of communications failure between the EV-1 CCU and the ACU-200. Such communications issues are typically caused by
- failure to secure the socket locking rings of SeaTalkng networking components ... move each locking ring to the unlocked position, unplug the cable's plug or Termination Plug, reinsert the cable's plug or Termination Plug, and then rotate the locking ring back into the locked position
- incorrect termination of the backbone ... the backbone should contain two SeaTalkng Termination Plugs, one will be inserted into each of the unoccupied blue backbone socket at each end of the backbone.
- insufficient backbone power ... while the ACU-200 can provide power to a SeaTalkng / NMEA 2000 which is limited to the autopilot components, it is considered a best installation practice to instead power the SeaTalkng / NMEA 2000 backbone from a switched 12VDC power circuit connected to the supplied SeaTalkng Power Cable which in turn is connected to one of the backbone's spur sockets.
- Modified or damaged SeaTalkng networking cables ... check the cables for damage or modification. Check the cable plugs and sockets for signs of damage or corrosion to the pins.
- SeaTalkng Termination Plug failure ... the resistance across the CAN_H and CAN_L pins of the SeaTalkng Termination Plugs should be 120 Ohms

Should all of the above have been addressed and should the problem persist, then unplug the MFD's spur cable from the backbone and then test the autopilot to determine whether the autopilot operates properly.