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5. CONNECTING BIOMETRIC READERS TO EWS CONTROLLER
5.1 CONNECTING BIOMETRIC READERS IN SAME RS-485 LINE WITH THE EWS CONTROLLERS
- The Biometric readers can be connected to virtually any controller that conforms to Wiegand format standards (standard
Wiegand 26bit or self-defined Wiegand).
- The lines D0 and D1 are the Wiegand lines and the Wiegand Number is sent through them.
- The RS-485 line (A, B) is used for fingerprint transfer and reader settings.
- The Biometric readers must be powered from the controller.
- If you use different power supply for the biometric reader, connect the GND from the both devices to ensure correct transfer
of the wiegand signal
- When you have connected the reader and powered on, the LED should flash in orange light + 2 beeps. This lets you know it’s
on and ready for use.
- Fingerprint enrollment is done from the PC Software. Connection between the Biometric readers and the PC must be
established.
•The Biometric readers are connected through RS-485 bus. The same RS-485 bus that the EWS controllers are connected to.
•Maximum units in one network (EWS + Biometric readers) is 32.
•If there are more than 32 units in one network, please utilize RS-485 HUB to connect.
•The RS-485 Line should be configured in the form of a daisy chain, NOT in a form of a star. If star must be used in some points,
keep the stubs from the RS-485 backbone as short as possible. Maximum length of the stub is dependant of the installation
(total number of devices in RS-485 line (total cable length, termination, cable type...) so recommendation is to keep stubs
shorter than 5 meters, keeping in mind that this can be possible reason for errors in communication with PC software
•The cable must be twisted and shielded with a min. 0.2 mm2 cross section.
•Connect the ground (0V) of each unit in the RS-485 Line using a third wire in the same cable.
•The shield of the communication cable between two devices must be connected to the EARTH from ONE side of the RS-485
Line. Use the side that has earth connection to the building’s grounding network.
150m. max