Title: Hardware Installation Guide.pdf
For DC power sources, isolated and non-switching, regulated DC power is required. A 250 mA current is required for DC power supplies.Note:If using a 12 VDC power source (preferred), be sure to observe polarity.Power Source Wiring12 VAC1 2 VACDC ACGND... OR ...12 VDC+1 2 VACDCAC–GND105.1.4Downstream Device CommunicationThe BRI can be configured to communicate downstream with up to 8 input/output devices, using Port 2 and Port 3. Each of these ports can only be wired only as a 2-wire RS-485 interface, for multi-drop communication on a single bus of up to 4000 feet.revision 6 — 529LNL-500B Biometric Reader Interface