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If you own a Z-tek USB to Serial adapter (often labeled as Z-tek ZK-US02 or similar), you know how essential it is for connecting older RS-232 devices—like routers, switches, GPS receivers, barcode scanners, or industrial equipment—to a modern computer without a native COM port.
To make it work correctly, you need the proper driver. Below, you’ll find the official, free driver and installation instructions.
If your adapter uses an FTDI chip, visit ftdichip.com for their Virtual COM Port (VCP) drivers. Z-tek Usb To Serial Comm Port Driver Free Download
When searching for "Z-tek driver free download," you will encounter many advertisements and third-party sites. Please keep these safety tips in mind:
Some Z-tek adapters use counterfeit Prolific chips. Official drivers after 2012 intentionally disable these. Here’s how to fix it: If you own a Z-tek USB to Serial
Option 1 (Recommended): Use an older driver (v3.3.2.105) – download the Legacy Driver above.
Option 2: Manually roll back:
Option 3: Replace the adapter with a genuine FTDI or CH340-based model (more reliable long-term).
| Problem | Likely Cause | Solution |
|---------|--------------|----------|
| Code 10 (Device cannot start) | Counterfeit PL-2303 on Win 10/11 | Replace adapter (e.g., with CH340/FTDI-based). |
| COM port not appearing | Driver not loaded | Run driver installer as Admin; check USB cable. |
| Port shows but no data | Baud rate mismatch | Match device settings (e.g., 9600, 8N1). Use PuTTY/Tera Term. |
| Linux/macOS not working | Missing driver | Use built-in ch341.ko (Linux) or SiLabsUSBDriver.dmg (macOS). | If your adapter uses an FTDI chip, visit ftdichip
Open Device Manager. Expand "Ports (COM & LPT)." You should see "Prolific USB-to-Serial Comm Port (COM3)" (or another number). Right-click → Properties → Driver tab. Verify the driver provider is "Prolific" and the date is recent.