Capable of bi-directional data transmission at speeds up to 2.0 MB/s .
The CH351Q is favored for industrial applications such as CNC engraving machines, POS systems, and older printer hardware. CH35XDRV.EXE - Nanjing Qinheng Microelectronics Co., Ltd.
If your CNC machine isn't responding, ensure the software (like Mach3 or LinuxCNC) matches the I/O address found in the Device Manager. LinuxCNC Forum Quick Tip: ch351q parallel port driver
If your device works for printing but fails inside specialized software, the software is likely hardcoded to look only for traditional motherboard addresses ( 0x378 ).
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Note: In Windows 10 and 11, the operating system strictly manages PCI resources. You cannot manually check the "Use automatic settings" uncheck box to force the address back to 0x378. The remapping must be done inside your target software. 7. Troubleshooting Common Errors Error: "Device Cannot Start (Code 10)"
Linking older EEPROM and microcontroller programmers to modern PCs. 2. Where to Download Official CH351Q Drivers If your CNC machine isn't responding, ensure the
Click , navigate to the unzipped folder containing the CH351Q driver files, and click Next .
The is a core software component required to run hardware cards based on the WCH CH351Q chipset . Developed by Nanjing Qinheng Microelectronics (WCH) , the CH351Q is a legacy PCI-bus interface chip. It bridges older peripheral standards to modern computer systems, frequently running as a PCI to 1-Port DB25 Parallel Adapter Card or a multi-I/O serial/parallel hub.
Windows 10/11 will auto-install a generic driver that treats the card as a PCI device, but it does not create a legacy LPT1 port that old software can see. Your app is looking for an I/O address like 0x378 ; instead, the card is using a memory-mapped range.