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P997 Keys Test
You should press each key, to confirm it works, with a counter showing how many
more keys you have to press. Press the CANCEL key last, as this will confirm if
all keys were pressed or not. If they were not, then an error message is displayed.
P998 Relays Test
Press a numeric key corresponding to the number of the relay you wish to test, and
the relay will change state each time the key is pressed. If you press any other key
other than a valid relay number then the test will end.