Dan, I couldn't have said it better. A good enrollment is they key. So check the enrollment score
My favorite scenario is to enroll 4x fingers:
- 2x from the left hand (Thumb + best between Index finger and Middle finger)
- 2x from the right hand (same as above)
In case you save these fingerprint in the fingerprint reader internal memory then it gives you indication about the total capacity of users that you can reach.
For example, if using:
- Old generation fingerprint readers (5,000 fingerprint capable) => 1,250 users max in 1:N
- New generation fingerprint readers (100,000 fingerprint capable) => 25,000 users max in 1:N
In some case you may have to enroll only 2 fingerprints (because of HW limitation). In that case, think about the position of the fingerprint reader on the door/turnstile (is it on the left or on the right of the users?)
Also most fingerprint vendors have the possibility to enroll Duress fingers. The duress finger will open the door but it will send an alert to the Security Monitoring Room (in case someone force an employee to open the door). Duress often uses proprietary format (it cannot be sent via wiegand, so you will have to SQL DB sync events), but soon it shall be available via OSDP thanks to SIA efforts (in next OSDP v2.17?)
How to enroll a fingerprint (guide) =>
http://kb.supremainc.com/knowledge/doku.php?id=en:1xfaq_how_to_enroll_a_fingerprint