Ch351q Parallel Port Driver Upd (2026)
If the port is not working properly, try the following solutions:
The is a specialized PCI-to-parallel/serial bridge chip developed by Nanjing Qinheng Microelectronics (WCH) . It is primarily used to add legacy communication ports to modern desktop computers that no longer include onboard LPT or COM headers. 1. Hardware Specifications
Extract the contents of the CH35XDRV.ZIP folder using a tool like 7-Zip. Press Win + X and open . ch351q parallel port driver
This comprehensive guide covers everything you need to know about finding, installing, and troubleshooting the CH351Q parallel port driver across various operating systems. 1. What is the CH351Q Chip?
This comprehensive guide will walk you through everything you need to know about the CH351Q and its driver, from a technical overview to detailed step-by-step installation instructions for various platforms. If the port is not working properly, try
If you see an exclamation mark (!), the driver did not initialize properly and requires a manual override. 4. Manual Driver Installation (Inf Method)
Double-check the LPT port assignment in Device Manager. Some legacy software expects the port name to explicitly be LPT1 . Double-click the port in Device Manager, navigate to Port Settings , and change the LPT Port Number dropdown menu to LPT1 (ensuring it is not marked as "in use"). 6. Linux Kernel Support for CH351Q navigate to Port Settings
Your old software wants 0x378 . The CH351Q is at 0xDFA8 . You have two choices:
The CH351Q adds ~1-2 microseconds of latency compared to a native ISA parallel port. This is acceptable for most CNC step rates (up to 35 kHz). For higher frequencies, consider an external motion controller.
If you are using a CNC machine, you may need to configure the card to EPP or ECP mode in the Device Manager settings to ensure fast bidirectional communication.
The CH351Q is a PCI bus bridge chip. It's the "brain" found on the majority of PCI-to-Parallel port expansion cards available on the market. Its primary function is to connect your computer's PCI bus to a standard DB25 parallel port connector, allowing you to use legacy parallel devices.