Vaddio Canon VC-C50i Programmers - Manual (Page 93)

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Condition of Error flag to be set
Busy •In process of camera initializing operation by Camera Reset
command, etc.
•In status of exposure mode auto.
•In status of AE Lock ON.
•In case of executing Preset Move command.
Parameter Error •In case of assigned parameter out of range.
•When the low-speed is set out at the low speed.
Mode Error •Not in status of Camera ON.
•Not in status of Host Control Mode.
• When the low-speed shutter is specified at the time of the Digital
zoom mode.