Zk-u485 Driver

Before diving into drivers, let’s quickly review the hardware. The ZK-U485 is a USB-to-RS485 converter used primarily to connect ZKTeco devices (like the U100, K40, F18, SF300, and others) to a computer via USB. Most modern PCs lack native RS485 or RS232 serial ports, so the U485 acts as a bridge, converting USB signals to the RS485 protocol required by older or industrial-grade access control devices.

Key features of the ZK-U485:

Visit the ZKTeco global support page (zkteco.com) → Support → Downloads. Search for "U485 driver." ZKTeco typically bundles the driver with their software packages (e.g., ZKBioSecurity, ZKAccess). zk-u485 driver

Use a free tool like Termite or PuTTY:

Many ZK-U485 units use the Prolific PL-2303HX or PL-2303TA chip. Go to prolific.com.tw → Support → Downloads. Download the appropriate driver for your OS (Windows 11 users: note that older PL-2303 chips may not be compatible). Before diving into drivers, let’s quickly review the

Important: Many ZK readers require a Device ID (e.g., 1–255). This is set on the device keypad, not in the driver.

Prolific drivers for older chips (PL-2303HX) are not digitally signed for Windows 10/11. To install: Important: Many ZK readers require a Device ID (e

Cause: Windows assigns a new COM number dynamically. Fix: In Device Manager → Port Properties → Advanced → Check "COM Port Number" and assign a fixed number (e.g., COM3). This ensures your attendance software always finds the device.