I have a
Fluke 115 multimeter available that I'm hoping has capabilities to register (even with low fidelity) any MIDI signals flowing out of a handful of devices. There's an old keyboard that I'm testing out which has the standard MIDI IN/OUT ports on the back and so far the
IN port I can verify is working because sending MIDI through my laptop over a USB to MIDI cable can trigger the notes to be played on the keyboard's speakers using the
MidiOx utility. However the opposite direction is not operating and I'm hoping to test that port for some basics with a multimeter.
I'm starting from scratch here and need to learn the pins and "electrical specifications" of MIDI. I don't need a full resolution oscilloscope to see the fine grained signals for each note, I'm just hoping for a basic test using something like the
Hz setting on my multimeter. Looks like the Fluke unit tops out at
50 kHz so I'm hoping an aliased signal still can be captured on the multimeter that I can reliably trigger for certain keys that would indicate something is at least working. I might be out of luck there given that the wiki article states that
MIDI messages are made up of 8-bit words (commonly called bytes) that are transmitted serially at a rate of 31.25 kbit/s. This rate was chosen because it is an exact division of 1 MHz, the speed at which many early microprocessors operated.
Am I understanding things properly that pins 4 and 5 would be the ones to target? Anyone have any advice which keys to choose and if it would even matter.