What is the difference between Wiegand and TCP/IP card reader output?
Wiegand is a legacy serial pulse protocol sending credential ID to a nearby door controller or panel over dedicated twisted-pair cable (typical max 100 feet). TCP/IP readers transmit data directly to networked access control systems over standard Ethernet, enabling remote auditing and real-time updates but requiring network infrastructure and PoE power. Choose Wiegand for retrofit and simple single-building deployments; TCP/IP for multi-site and cloud-integrated systems.
Can I mix proximity and smart card readers on the same access control panel?
Yes, if your control system or door controller supports multiple input protocols (Wiegand, RS-485). However, you must provision both 125 kHz and 13.56 MHz readers at each entry point, or educate users which technology to use at each door. Multi-technology readers eliminate this confusion by accepting both frequencies in one unit but cost more upfront.
What read range should I expect from outdoor proximity readers?
Standard outdoor proximity readers operate at 3–6 inches in dry conditions. In rain, humidity, and temperature extremes, read range may drop 10–20% due to antenna detuning. Stainless steel bezels and polycarbonate windows can further reduce range. Always test on-site with actual credential stock before mass deployment; if range is inadequate, upgrade to high-power readers (8–10 inch range) or switch to smart card readers with better environmental stability.
How do I choose between wall-mount, mullion-mount, and pedestal readers?
Wall-mount is cheapest and fastest for standard door frames. Mullion-mount fits glass door stiles and requires a special frame kit ($200–$500). Pedestal readers stand free-standing on concrete pads for high-traffic vestibules and security checkpoints. Mullion and pedestal readers are essential for aesthetic and durability reasons when wall-mount isn't an option; verify door hardware compatibility and clearances before ordering.
Do card readers require separate power supplies, or can they run on PoE?
Most hardwired readers (12 VDC, 50–200 mA) require a dedicated 12 VDC power supply, often integrated into door control hardware or a central access hub. PoE-enabled readers draw power from Ethernet but are more expensive. For distributed outdoor deployments with long cable runs, PoE-enabled readers simplify infrastructure by eliminating separate power lines; factor PoE budget into your switch and hub selection.
Should I use encrypted smart card readers, or are proximity readers sufficient for my facility?
Proximity (125 kHz) credentials are unencrypted and can be cloned with publicly available tools—acceptable for low-security retail and office entry. Smart card and NFC readers with AES-128 encryption and mutual authentication are essential for data centers, labs, government, and healthcare environments. Hybrid approaches (proximity for general access, smart card for secure zones) balance cost and security; coordinate with your control system's audit and revocation policies.
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