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Increase/Decrease volume by a relative amount
Output 1: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 3Eh <VA> F7h
Output 2: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 3Fh <VA> F7h
Output 3: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 40h <VA> F7h
Output 4: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 41h <VA> F7h
Output 5: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 42h <VA> F7h
Output 6: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 43h <VA> F7h
Output 7: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 44h <VA> F7h
Output 8: F0h 00h 01h 00h <Device ID> 0Ah 69h 04h 03h 45h <VA> F7h
where, <VA> = [2 * (dB Change) ] & 7Fh
i.e., multiply the amount of change (in dB) by 2 and then logically AND that product with 7Fh. For
example, to decrease the volume by 2 dB:
<VA> = [2 * (-2)] & 7Fh
<VA> = [-4] & 7Fh
<VA> = 7Ch
It is not necessary to calculate this equation by hand. Both AMX and Crestron can be programmed to calculate
this equation.
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