100-140 Question 78
Select 3A technician is troubleshooting a legacy device that connects to a desktop using a serial port. The device is not being detected by the system, and the technician suspects the issue might be with the configuration. Which of the following steps would MOST likely resolve the issue?
- A
Verify that the correct COM port is assigned to the device in the operating system.
- B
Check that the baud rate, parity, data bits, and stop bits match the device's requirements.
- C
Ensure that the serial port is enabled in the system's BIOS/UEFI settings.
- D
Update the Ethernet driver to ensure network connectivity.
- E
Replace the serial cable with a USB cable for faster communication.
Show answer and explanation
Correct answers: A, B, C
Explanation
Serial ports require specific configurations to communicate with legacy devices, including correct COM port assignment, matching communication settings (baud rate, parity, etc.), and ensuring the port is enabled in the BIOS/UEFI. Addressing these factors is essential for resolving detection issues. The other options either pertain to unrelated interfaces or do not address the problem.
- A. Correct.
Verifying the COM port ensures that the operating system is correctly mapping the serial port to the device, which is critical for communication.
- B. Correct.
The baud rate, parity, data bits, and stop bits must match between the system and the device for proper communication through the serial port.
- C. Correct.
If the serial port is disabled in the BIOS/UEFI, the operating system will not be able to detect or use it.
- D. Incorrect.
Updating the Ethernet driver is unrelated to troubleshooting a serial port issue since Ethernet is a separate communication interface.
- E. Incorrect.
Replacing the serial cable with a USB cable is not a valid solution unless the device supports USB, and it does not address the root cause of the serial port issue.