MIDI phantom power question?
Does anybody know which pin is positive and which is negative on a 7 pin MIDI cable?
I've bought a 7 button footswitch which is phantom powered, but my Presonus interface only has 5 pin, non phantom powered sockets.
I want to wire a socket for an external wall wart into it. All I can find is that pins 6 & 7 are for phantom power, but I can't find any info on polarity.
FTI, the connected cable: pin 4 is white, pin 5 is yellow (MIDI connection) and pin 6 is red, pin 7 is blue (phantom). Being an electrician, I'd suspect that red is the positive, but being an electrician, I'd rather wait until somebody could confirm or deny.