According to the information I'm finding on the Internet, there is an APM303 configurator, but unfortunately, I can't find any downloadable version of the application. This probably means that the software must have been included in the device's original package.
In case it's not there, I recommend contacting the company that distributes the product using this phone number: 800-763-0359 (Miami, Florida, USA) as their support team should be able to help you out.