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: If using an older motherboard, ensure the PCI bus is enabled and "Plug and Play OS" is set to "Yes."
Because this card acts as a bridge, the operating system needs a driver to recognize it as a COM/LPT device rather than just a PCIe bridge. 2. Where to Download CH351Q Drivers
The CH351Q is a widely used PCI-to-parallel-port interface chip developed by Nanjing Qinheng Microelectronics (WCH). As modern motherboards phase out legacy parallel (LPT) ports, expansion cards utilizing the CH351Q chip bridge the gap. They allow modern operating systems to communicate with legacy hardware like dot-matrix printers, CNC machines, hardware dongles, and JTAG programmers. ch351q parallel port driver
If you downloaded a zip archive containing raw driver files ( .inf , .sys ), follow these steps: Open the Start menu, type , and press Enter.
The parallel port mode mismatch between the printer and the CH351Q configuration.
You can also find the driver on the mini-CD that often ships with the retail PCI card. However, it's always best to download the latest version from WCH to benefit from bug fixes and expanded OS support. This public link is valid for 7 days
Visit the official WCH website and download the official multi-purpose PCI parallel/serial card installer package (typically named CH35XDRV.EXE or similar).
The specific (e.g., CNC controller, printer) you are trying to connect.
The standard installation process is straightforward: Can’t copy the link right now
Re-seat the card. Check your motherboard BIOS settings to ensure PCI Plug-and-Play is enabled and that there are no conflicting onboard resources.
Ensure the LPT port number matches the number required by your software (e.g., LPT1). 5. Troubleshooting CH351Q Driver Issues If the card is not working, try these steps: A. "PCI Simple Communications Controller" Error