Hardware⏱️ 3 min read📅 2026-06-15

How to Fix: Error on multi serial port cards

Technical issue with multiple serial port cards causing data corruption and CRC errors.

Quick Answer: Check for faulty hardware, such as the PCI-e card or cable, and consider replacing them.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

We have encountered a persistent issue with sporadic communication problems on serial ports, affecting our system's reliability. The problem is exacerbated by corrupted data, resulting in CRC errors during file transfers.

This issue has been frustrating due to its intermittent nature and the impact it has on our system's performance. To resolve this, we will follow a step-by-step guide to identify and fix the root cause of the problem.

🛑 Root Causes of the Error

  • The primary reason for this error is likely related to issues with the serial port cards themselves. Given that three different cards from different manufacturers (SUNIX, Moschip, Oxford) are affected, it's possible that there's a manufacturing defect or compatibility issue with the cards. Additionally, the use of PCI-e 1x interfaces without IRQ conflicts suggests that the problem might be specific to these components.
  • An alternative reason for this error could be related to issues with the operating system or drivers, which may not be properly configured or optimized for serial port communication. This could also include problems with the USB serial adapters used as a fallback solution.

✅ Best Solutions to Fix It

Hardware Troubleshooting and Replacement

  1. Step 1: Step 1: Inspect the serial port cards for any signs of physical damage or wear. Check the PCB for burn marks, excessive heat, or other indicators of mechanical stress.
  2. Step 2: Step 2: Verify that the PCI-e 1x interfaces are properly configured in the BIOS settings and that there are no IRQ conflicts between the cards.
  3. Step 3: Step 3: Replace the serial port cards with new ones from different manufacturers to rule out any manufacturing defects. Also, try using a different cable and USB serial adapter (Asix) as mentioned earlier.

Software Troubleshooting and Configuration

  1. Step 1: Step 1: Update the operating system and drivers for the serial port cards to the latest versions. Ensure that all necessary software is installed and configured correctly.
  2. Step 2: Step 2: Configure the BIOS settings to prioritize the serial ports and ensure that there are no IRQ conflicts between them.

🎯 Final Words

To resolve this issue, we recommend following the hardware troubleshooting and replacement steps first. If that doesn't yield results, we can proceed with software troubleshooting and configuration. Additionally, it's essential to keep in mind that using a USB serial adapter as a fallback solution may not address the underlying root cause of the problem.

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