Bio Sync Troubleshooting Guide

Bio Sync Troubleshooting Guide


Bio Sync and BioManager
Troubleshooting Guide


The Red LED on the Biometric
Reader is constantly blinking

There were 15 unsuccessful attempts of authentication (finger or PIN). The red LED will turn off after the first accepted finger or PIN.

The keypad of the Biometric
Reader is not working

The Operation Mode of the biometric reader is set as “Finger”. Please select “Keycode OR Finger” mode.

Enrollment from desktop reader can be done, but the Fingerprints are not sent to all Biometric Readers in the network

  • Check the serial number of the readers.
  • Check if proper termination has been done as per setup documentation.
  • Check if the communication wires (wires A and B) are properly connected to the reader
  • Ensure the RS-485 network topology is a daisy-chain connection

The Biometric Reader is not powered ON. The tri-color LED
is OFF

Check the power supply (red & black wires) and verify the incoming voltage from the power-supply is between 12VDC AND 14VDC.

Fingerprint (or PIN Code) is recognized (the tricolor LED is green), but the controller reports other ID number and access is denied

  • If the user is not deleted from the reader and the same user is enrolled again with a new ID, the reader will recognize the finger with the first ID. To resolve this, delete all users from the reader and then upload all users to the reader.
  • Check the Wiegand bus (Data 0 and Data 1 wires).
  • Check if the ground of the controller and the BioSync reader is the same.
  • Check if the cable run length between the BioSync reader and the controller is less than 150m.

Electromagnetic Interference/Discharge
is affecting the Fingerprint Scan

Connect the housing of the biometric reader to the earth wire

Finger scanner reading is greatly reduced


  • Check if the fingerprint read area is dirty. DO NOT clean the device with any form of liquid. Use a soft, dry cloth only.
  • Check if the read area is damaged . If the damage is minor, try calibrating the sensor.

PIN Codes are working correctly, finger scan does not work. The tri-colour LED
is OFF

  • Fingerprint sensor malfunction
  • Check the sensor position and its physical condition.
  • Reset the system.
  • Contact your installer.

Fingerprint is not being Recognized

  • Retry after drying your finger.
  • If your finger is too dry, try touching your forehead and attempting again.
  • If you have a cut on your finger you should try enrolling a different fingerprint.

Users are not Displaying after
Restoring a Backup

Try clearing the local cache in the client:
  1. Log into the BioManager client.
  2. Go to Settings >> Servers.
  3. Click the 'Clear Local Cache' option.
  4. Log out of the client and log back in.


Fingerprint Readers are Going Offline


Ensure the RS-485 network topology is a daisy-chain connection and not a 'star' configuration.
If the line is long or there are a lot of devices are connected, communication could be unstable. In that case termination should be placed on one or both ends of the line. On the CNV-1000 module, the terminating resistor is functional when the jumper is closed. For other end of the line, if needed, the resistor should be placed manually at the end of the line.


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