A Mercury board replacement is a two-part job: the physical swap and the software reconfiguration. The physical part takes 30 minutes. The software part depends on your platform and how well you documented the old board's settings before it failed.
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Before You Order: What to Document
Controller IP address: Found in your access control software under hardware configuration
MAC address of the old board: On the board label and in your software
Reader formats: Wiegand 26-bit, 34-bit, OSDP, or other
Door assignments: Which doors are assigned to which reader ports
Downstream panels: Document which downstream panels connect to this head-end
Network settings: Subnet mask, gateway, DNS
Step 1: Power Down and Label Everything
Label your wiring before you disconnect anything. Use tape flags or a label maker. Label each terminal block: "Reader 1 D0," "Reader 1 D1," "Door 1 Lock," "Door 1 REX," "Door 1 Contact," etc. Take a photo of the wiring before disconnection.
Disconnect RS-485 wires if downstream panels are connected
Disconnect Ethernet cable
Disconnect power input from the power supply
Remove the board from its mounting hardware
Step 3: Mount, Wire, and Configure the New Board
Mount the new board. Reconnect wiring using your labels as a guide. Add the new controller in your access control software with its IP address. Verify doors, test readers, and confirm lock outputs.