Is there a way that I can check if the ACU-200 Seatalk port is working for data? I've turned off the power output to Seatalk using the DIPswitch and am using a separate Seatalk NG power cable to power the bus.
The bus also has an EV-1, P70S and a A70D MFD connected.
Welcome back to the Raymarine Forum Denis,
The About System diagnostic feature (MENU->SET-UP->DIAGNOSTICS->ABOUT SYSTEM) of the p70/p70S/p70R/p70RS autopilot control heads may be used to query the SeaTalkng backbone for other devices within the network. Should a device be listed by the About System feature, then communications between the device and the SeaTalkng / NMEA 2000 backbone has been verified. In the case of your system, the p70S, ACU-200, EV-1, and A70D should be listed.