Unused Error Correction Threshold

Usage:	Lets the user set the acceptable level of symbol quality.
Definition:	Conforms to ISO/IEC 16022 symbol quality grading (A,B,C,D).
Serial Cmd:	<K800,output on symbol contrast,symbol contrast threshold,output on print growth,print growth threshold,output on axial non-uniformity,axial non- uniformity threshold,output on UEC,UEC threshold>
Default:	Grade C
Options:	0 = Grade A 1 = Grade B 2 = Grade C 3 = Grade D