But until they do, don't worry. While serial connection problems are complicated, they are usually solvable. Please get comfortable and read on. It will take some time to go through this document, but the information presented here is essential in helping you define and solve your connectivity problem. This section will help you understand some background on how PCs typically handle and configure serial ports.
Many different configurations are possible.
And that's a big part of the problem. Follow the instructions in this section to find out how the serial ports on your PC are configured. See Troubleshooting Compare your configuration with the information presented in this section. You may be able to do that yourself, or you may need to contact service personnel for help. If you need to call for service, this guide will help you determine who to call.