Keypad Communications Failure

The batteries died in my wireless Keypad (Centralite).  I replaced the batteries, with fresh batteries, which I tested with a multimeter.  I put the keypad back on the wall.  I now have a "keypad communications failure" showing in both the app and on the touchpad.  The keypad lights work, and the buttons appear to work, but it will not arm or disarm the alarm system.  It appears the keypad is no longer paired/communicating with the system overall.  The online troubleshooting guide suggests resetting the keypad, but the instruction link does not work (just back to same troubleshooting page).  Can you 1) please post proper reset instructions for the Centralite keypad, and 2) please post instructions for re-pairing, assuming the reset does not solve the problem.  It is possible I triggered the tamper switch when opening the battery case, as it was difficult to open.