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Analog to DMX outboard: Difference between revisions
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the outboard for use on OB's that need more cleverness, but don't have a full desk available.
m (Created page with 'The analog to DMX outboard is going to be a little box for when you don't have a full lighting desk available. It gets power from the Analog to DMX box, and sends back differ...') |
m (the outboard for use on OB's that need more cleverness, but don't have a full desk available.) |
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==Why are there two grounds?== | ==Why are there two grounds?== | ||
* The [[Analog to DMX]] box expects a reference Gnd from wherever it gets it's signal, this can be used, in conjunction with the AREF of some microcontrollers, to boost or cut the | * The [[Analog to DMX]] box expects a reference Gnd from wherever it gets it's signal, this can be used, in conjunction with the AREF of some microcontrollers, to boost or cut the difference between 'reference' and signal (channels), so that was given a separate line. Usually, just leaving this alone or common (i.e. pins 14 and 15 bridged) is fine - it's main reason for existance is to be used as part of a compensator for long cable runs making voltage drops. | ||
* The [[Analog to DMX]] also sends ground out to | * The [[Analog to DMX]] also sends 0v ground out to it's controlling devices, so they can operate - rather than being boxes of variable resistors. | ||