TL;DR

• Readers capture credentials (cards/phones/PIN) and talk to your controller.

• Electric strikes secure the latch so you control entry while preserving free egress.

• Power supplies keep everything reliable during surges and outages.

Readers (what identifies people)

• Tech options: 125 kHz prox (legacy), 13.56 MHz smart (DESFire/iCLASS), mobile creds (BLE/NFC), PIN pads.

• Protocol: Prefer OSDP v2 over Wiegand for encrypted, supervised communication.

• Tips: Standardize one credential type; confirm reader↔controller bit formats; plan for mobile if your org uses MDM.

Electric strikes (what actually moves the door)

An electric strike replaces/augments the frame strike and works with your latchset—ideal when you want mechanical egress with controlled entry.

• Fail mode:

  • Fail-secure (stays locked on power loss) for perimeter/security.

  • Fail-safe (unlocks on power loss) where code requires free egress on outage.

• Match the opening: Cylindrical vs. mortise latch, frame material (HM/wood/aluminum), fire rating.

• Power profile: Check inrush and holding current; size wire to limit voltage drop.

Shop spec-ready electric strikes that include multiple faceplates and support both fail-safe and fail-secure wiring.

Power supplies (what keeps it alive)

Clean, right-sized power prevents nuisance failures and inspection headaches.

• Centralized vs. distributed:

  • Distributed near the door = easier voltage drop management, simpler troubleshooting.

  • Centralized = simpler UPS/battery and monitoring—plan for cable length and inrush.

• Must-haves: Battery backup, supervised outputs, fire alarm interface (FAI), and 30–50% capacity headroom.

• POE caveat: Some controllers can drive locks via POE(+); confirm budget for inrush.

Consider monitored access control power supplies with fused/individually protected outputs and proper battery charging.

Quick compatibility checklist (clip this)

• Door type & label: Fire-rated? Egress path?

• Locking method: Strike vs. maglock (strike is simpler for latch doors).

• Reader ↔ controller: OSDP v2, credential format, facility codes.

• I/O & sensors: Door position, REX, supervised loops (EOL).

• Power math: Sum loads, add inrush, then +30–50% headroom; check cable length/voltage drop.

• Fail mode: Document fail-safe/fail-secure per AHJ.

• Network: POE budgets, VLAN, controller reachability.

Common “good” setups

• Standard office door: OSDP reader + cylindrical latch + electric strike (fail-secure) + local PSU w/ 8-hour battery.

• Fire-rated corridor door: Listed hardware, closer, electric strike (permitted type) + centralized PSU with FAI.

• Storefront (wind load): Top-jamb closer, heavy-duty electric strike, distributed PSU to minimize voltage drop.

• Healthcare interior: OSDP reader + mortise lock + strike (fail-safe) + PSU; consider delayed egress relays if policy allows.

Fast answers

OSDP or Wiegand? OSDP v2 for encryption and supervision—future-proof it.
Strike or maglock? On latch doors, use a strike to keep egress intuitive.
Why do doors “randomly” fail? Undersized PSUs, voltage drop, or missing flyback suppression on DC loads.

Wrap-up

Treat access control like any enterprise system: standardize readers, choose the right strike behavior, and overspec clean power. Do that, and the door just…works.