Ch351q Parallel Port Driver May 2026

The CH351Q is a high-performance PCI interface chip manufactured by WCH (Nanjing Qinheng Microelectronics). It is primarily used in expansion cards to add high-speed Parallel (LPT) and Serial (UART) ports to modern computers that lack built-in legacy headers. 🛠️ Key Technical Specifications

For Linux (Real-Time Kernel):

• Use the rtirq script to boost interrupt priority of the parallel port.
• Blacklist the lp module to avoid contention: echo "blacklist lp" >> /etc/modprobe.d/blacklist.conf

Part 3: Downloading the Official CH351Q Parallel Port Driver

Warning: Many third-party "driver download" websites bundle adware or outdated drivers. Always obtain the driver from official sources. ch351q parallel port driver

: Execute the installer. It will pre-install the drivers into the Windows Driver Store. Physical Install The CH351Q is a high-performance PCI interface chip

• SPP (Standard Parallel Port)
• EPP (Enhanced Parallel Port)
• ECP (Extended Capabilities Port)

1. Check detection: lspci | grep -i parallel
2. Load the module: sudo modprobe parport_pc
3. Find the I/O address: sudo cat /proc/ioports | grep parport
4. Force assignment: sudo modprobe -r parport_pc && sudo modprobe parport_pc io=0x378 irq=none

1. Set the parallel port mode: Open the Device Manager, right-click on the CH351Q parallel port, and select "Properties". In the Properties window, go to the "Advanced" tab and select the desired parallel port mode: