Check the DIP switches on the underside to make sure they are set as follows:
If your PC has a PS/2 style keyboard port (about the diameter of a pencil):
SW2 and SW8 should be set to "OFF"
All the other switches should be set to "ON"
(These are the factory default settings.)
If your PC has a PC/AT style keyboard port (about the diameter of a dime):
SW2, SW4 and SW8 should be set to "OFF"
All the other switches should be set to "ON"
At this writing, the instructions given for Switch 4 on page 6 of the WMR-1200 User's Guide are incorrect. Follow the instructions above, instead.