Duplicate Punch Duration in Biometric Attendance Systems
What the Duplicate Punch Duration setting does, why it blocks repeated punches within a set time, and when to disable it to record every punch.
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Biometric Device Power Supply: Fix Repeated Restarts
Biometric devices that restart repeatedly often have a weak power adapter. Learn the 12V-2A and 12V-4A adapter recommendations and what to do next.
Troubleshooting Offline Biometric Attendance Devices
Biometric device showing offline despite a stable internet connection? Learn how to tell a network problem from a device fault and what to check first.
Callback URL Guide: What It Is and How to Set One Up
Learn what a callback URL (webhook) is, how to create and secure an endpoint that accepts HTTP POST requests, and how to test it with Postman or cURL.
DHCP on Biometric Devices: Benefits and When to Use Manual IP
How DHCP automatically assigns IP address, subnet mask, gateway and DNS to a biometric device, and when manual IP configuration is the better choice.
Punches Not Transmitting or Queuing Up: Causes and Fixes
Troubleshoot biometric punches that do not reach your server: check device status, server URL and response, retry rules, and how to restart the queue.
How to Bring a Biometric Device Online: Setup Guide
Connect a biometric device to the network by LAN or Wi-Fi, whitelist the server IPs and domains, set the server address and port, and troubleshoot.
How to Lock a Biometric Device Menu (Admin Lock Guide)
Step-by-step guide to locking a biometric device menu so only admin users can change settings, while everyone else can still mark attendance.
Integrate ZKTeco Biometric Devices with Cloud Apps via API
How to connect ZKTeco biometric attendance devices to a cloud application with the Cams Biometrics API: verify the device, set up the network, callbacks.
