Acroprint TQ600 (software version 4.x and above) - Manual (Page 8)

2
Operator Panel LEDs
1) Normal Operation.
Green light blinks each second .
2) Error Condition (Fingerprint or Badge not Enrolled)
Red light shines for 2 seconds
3) Transaction (Fingerprint or Badge Read) successful
Green light shines for 2 seconds
Note: Contact Acroprint support if you receive any LED
sequence other than those listed above.