Richard,
Strange, if you got frequencies entered then you should get register 2 to change.
As Dave says Append CR (or CR-LF) has to be set in the terminal program. If not then you get no reply.
73 Alan G4ZFQ
. got my two
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frequencies entered via the switches and push button. (Yes, I totally understand BCD, yes, I understand which slider switches correspond to 8, 4, 2 and 1, yes, I waited for the LED to quit flashing before entering the next digit, yes I tried various short durations while pressing the push-button), but it took many repeated efforts to finally get the frequencies programmed. Still, I never could get the ProgRock to accept my frequency correction inputs in Register 02. It wouldn't budge. Ignoring me totally.
