1. Check your RS-232 serial cable. It should be a straight-through standard 232 cable.
2. Check the DIP switches on the back of the 322. For a single unit at address 1, only switch 1 should be up. All others should be down.
3. Make sure the 232 cable is firmly connected between your PC’s serial port and the 322’s front panel 232 input.
4. Power the unit on.
5. Open the 322 Designer software.
6. Under the File->Preferences menu, make sure you have the correct serial port selected. If you do not know which COM ports are available on your computer, check the Windows Device Manager.
7. Finally, press the Online button and choose DOWNLOAD design to units from CURRENT site file.
8. If that still doesn’t help, double check that the serial port on your PC is actually working correctly. Try to communicate with another unit of some kind. Try another serial port if you have one. Make sure that no other software is running that may be using the serial port. And finally, try another PC entirely.