USB-Serial-RS232-Loop-back-Test.pdf

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USB Serial RS232 Loop-back test and troubleshooting

Rev. 1.0

Please carefully follow this guide to make a loop-back test for any

standard USB to Serial RS232 adapter.

This guide is based on Windows XP 32-bit but same procedure is used for all other versions of

Windows.

If you experience any communication problems when using a USB to Serial RS232 adapter then

you can make a loop-back test to find out if the adapter is properly working; this way you might be

able to determine if the problem is caused by the adapter, your equipment or the drivers.

This guide applies to all USB serial RS232 adapters by USconverters including models:

ANU232Mi

ANU232STD

ANU232PRE

USUT880

Y106

UMC-104

MWE820B

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Confirming successful COM port installation.

In order to make a loop-back test you first need to make sure that the drivers and COM port has

been successfully installed.

1. With the USB Serial drivers installed, connect your USB serial adapter to your computer’s USB

port.

2. Check in Windows Device Manager (Start -> Control Panel -> System -> Hardware tab ->

Device Manager) under Ports (COM & LTP) if the COM port has been successfully created:

If the COM port is not listed in the Device Manager it has not been successfully created and you

need to determine the cause. This could be due to incorrect drivers, conflicting drivers if you have

other USB serial drivers installed, or simply an unsuccessful driver installation. A solution could

be to uninstall all current USB serial drivers, reboot and re-install the most recent drivers again.

Notice: a reboot is highly recommended after each driver un-installation/installation.

For other faults or error codes please refer to our online support section.

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If needed, the COM port can be changed by right-clicking the created COM port and choosing

Properties:

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The main driver screen will open where the adapter’s Device Status in listed:

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Under the Port Settings tab you will find the Advanced settings button: