Motorola SYMBOL LS9203 Reference Manual page 280

9-100 Symbol LS9203 Product Reference Guide
Security Level 2
Choose this option if Security Level 1 fails to eliminate misdecodes.
Security Level 3
If Security Level 2 has been tried, and are still experiencing misdecodes, select this security level. Be advised, selecting this option
is an extreme measure against misdecoding severely out of spec bar codes. Selection of this level of security may significantly impair
the decoding ability of the scanner. If this level of security is necessary, try to improve the quality of the bar codes.
Security Level 2
Security Level 3