The original NexDome Arduino based system suffers from shutter disconnect issues. This requires you to manually power cycle the shutter and then re-establish the position information to allow the shutter to operate correctly again.
This is done by manually connecting to the dome control system and using a serial terminal software, issue commands to the control system to normalise it.
The commands used to achieve this are;
You may also need to send a carriage return and new line escape sequence at the end of the command string by appending \r\n to the command.
SRS is shutter status
PWS sets shutter position (x) and upper limit (y)
CLS is close shutter
Check out the video below as I walk through this issue and process to recover and get the positional information back in sync again.
Full list of commands available are in the protocol document at; https://github.com/nexdome/ASCOM/wiki/Firmware-Protocol
To do this I use the ClearTerminal software, which can be obtained from; https://download.cnet.com/ClearTerminal/3000-2155_4-75221694.html
Consider subscribing to the channel and hit the notifications icon, so you can see latests videos and live streams (when I am next live, these are typically unplanned events, so no schedule set).
I upload my images to Telescopius, and you can find my profile at:
My other social locations are;