Canon VB-C10R - Manual (Page 127)

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● A023 Status change of external input devices (err)
Message a %1 detected at %2
%1 external device input change (front-edge|rear-edge)
%2 external device terminal (In1)
Explanation A change was detected at external device terminal In1. “front edge” denotes OFF
→ ON and
“rear-edge” denotes ON
→ OFF.
Log Messages