Casio moved many of their legacy printer drivers to their global support archive. You can find the "KL-Tool" software which acts as the driver interface for the KL-series.
Follow these steps to manually install the driver package on Windows 10 or Windows 11. Step 1: Extract the Driver Files
If it's missing entirely, use the Action > Add legacy hardware wizard in Device Manager, then manually select "Ports (COM & LPT)".
| Problem | Solution | |---------|----------| | | Reboot into BIOS and ensure "Legacy Devices" are enabled. Some boards disable COM/LPT by default. | | Error: "This device cannot start. (Code 10)" | Uninstall device in Device Manager, scan for hardware changes, then reinstall driver manually. | | COM port shows but no data transfer | Check baud rate, parity, stop bits. Use a loopback test with PuTTY or HyperTerminal. | | LPT printer prints garbled text | Change LPT mode from ECP to EPP or SPP in BIOS or driver settings. | | Driver installation freezes at 99% | Disable antivirus temporarily, then retry. Also check for conflicting old driver remnants using pnputil /enum-drivers . | com lpt 1711 driver download top
The "COM LPT 1711" designation typically refers to a that adds legacy ports to modern computers. The number "1711" often corresponds to a specific chipset identifier – commonly from brands like MosChip (MCS1711) or compatible ASICs. These chips provide:
If you are connecting a legacy device via a USB-to-Serial adapter, you need Prolific or FTDI drivers to make a COM port appear in Device Manager.
Downloading drivers from unverified third-party websites exposes your computer to malware and system instability. Use these trusted channels to acquire your driver. Method 1: Windows Update (Recommended) Casio moved many of their legacy printer drivers
For maximum stability and security, you should download drivers from official sources.
Modern motherboards sometimes disable resource allocation for legacy IRQ interrupts. Restart your computer, enter the BIOS/UEFI menu, and ensure that options like "OS Optimized Defaults" or "PCI Latency Timer" are configured to allow older expansion cards to request system resources. Check Cable and Hardware Integrity
The keyword "com lpt 1711" does not refer to a simple USB-to-serial cable, but rather points to a specific and powerful piece of industrial hardware: the . Step 1: Extract the Driver Files If it's
COM LPT 1711 refers to the driver for the Advantech PCI-1711
Because the 1711 driver isn’t Microsoft-signed for newer OS versions:
Legacy ports like COM (Serial) and LPT (Parallel) remain vital for industrial machinery, barcode scanners, and older laser printers. If your Device Manager displays a missing driver for a "COM LPT 1711" chipset, you are likely using a PCIe or PCI expansion card designed to add these ports to a modern motherboard.
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