MIDI phantom power question?

edited November 2014 in General

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.

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