How to correct the keypad response No RF Module when adding Inovonics RF Points.

When trying to add wireless points, the keypad responds with: NO RF MODULE. The B820 is correctly wired to SDI2 and has the EN4200 receiver connected. LEDs indicate proper operation.
Verify the B820 is set to the correct address which must be address 1. If the B820 is not set to address 1, the keypad will respond with NO RF MODULE.
B820