USB to Serial Adapter Troubleshooting

• Use a "real" RS-232 serial port, if available, in preference to a USB to Serial Adapter. You'll have no choice but to use a USB to Serial Adapter on modern Apple Macs.
• Verify that the USB to Serial Adapter's device drivers are up-to-date.
• Try a different USB to Serial Adapter.
• Try a different computer. Some combinations of USB to Serial Adapter and USB port are more reliable than others. For example, some laptop computers may not provide sufficent power to USB devices for reliable communications.
• One user reported that his USB to Serial Adapter did not work well when connected through a USB Hub.
• Some users have found better results with separately powered USB hubs rather than those that receive power from a USB port.
• A laptop's USB port may be more reliable if the laptop is powered by a power supply rather than its batteries.