I have been using a Raymarine
for several years all data connected thru the NMEA 0183
terminals of the Control Unit. And power to the unit came through the control unit which has it's own short Raymarine
NG network. All was well and happy.
I Recently "upgraded" several other parts
of my system,chartplotter, AIS
etc and setup a NMEA 2000
network between everything. Needed to make a converter cable to tie the Raymarine NG backbone to the NMEA
backbone as none is commercially available. All working fine. All devices see and talk to each other perfectly. Since only one power source can be used on an NMEA 2000
network there is a switch inside the ST70 Controller to flip off so the 2000 network will become the power source.
2000 recommends an On/Off switch to the backbone when not in use to prevent power drain. Well the ST70 gets it's power from the backbone -
Now the ST70 autopilot
brings me to the pilot setup screen
where I must go through the steps to configure all of my preferences at each time.
With my old setup the short Raymarine NG network that supplied only the Autopilot was always on with only a breaker for that device. The on/off switch on the ST70 turned off the display but the power to the unit kept the memory alive. Only time I ever had to go through the preferences settings was when I turned off or replaced the batteries
Is the ST70 supposed to have an internal battery
to keep settings stored in memory when power is fully turned off? If so it may have failed as the unit is about 10 years old. If not any suggestions how I can prevent having to reprogram my preferences each startup.