Green Flash Duration

Usage:	Provides visual verification that a good read has occurred.
Definition:	When a good read occurs, the green LEDs will illuminate and stay on for the time set in the Green Flash Duration value.
Serial Cmd:	<K750,green flash mode,target pattern status,green flash duration>
Default:	100 (1 second)
Options:	0 to 65535 (in 10mS increments)