Ch341par.exe Apr 2026

bcdedit /set testsigning on Then install driver. Reboot. | Tool | Description | |------|-------------| | io.dll + Python | Use pyParallel or pyWin32 with CH341 DLL | | CH341DLL | Programmatic access via C/C++/C# | | GiveIO / UserPort | For legacy LPT ports (not USB) | | libusb + libch341 | Cross-platform (Linux/macOS) |

for _ in range(10): write_parallel(255) time.sleep(0.5) write_parallel(0) time.sleep(0.5) ch341par.exe is a simple but effective tool for low-speed parallel port control over USB. While limited compared to full CH341 DLL access, it’s perfect for quick testing, education, and basic automation scripts.

For serious projects, consider using the (also from WCH) which gives faster, programmatic access without shelling out to an EXE. ch341par.exe

ch341par.exe -s 0x0D ; low ch341par.exe -s 0x0C ; high -r returns status byte. Busy is bit 7 (value 0x80). Invert logic (busy low = printer busy).

Data: 0x00 Status: 0x79 Control: 0x0F Interpretation depends on your wiring. ch341par.exe -w 255 Now pins 2-9 go high (+5V / 3.3V depending on adapter). Example 3: Set data pins to binary pattern To set D7..D0 = 10101010 (0xAA): bcdedit /set testsigning on Then install driver

First set all control pins high (inactive except INIT which is active high):

ch341par.exe -w 0xAA Control register bit 0 = STROBE, active low. While limited compared to full CH341 DLL access,

ch341par.exe -s 0x0C ; 0x0C = 00001100 → INIT=1, others high Then pulse strobe low and back: