MIDI spec question

try this

martin

From my recollection of the MIDI spec is ONLY ONE end should ground the shield of the cable. Thus keeping isolation if optos are used but maintaining some shielding without ground loops.

Then again it is several years since I looked at MIDI circuits.

In article , martin griffith writes

Need to register to read it!!

The answer is - the midi spec says so. It is to ground the cable screen (if there is one) to help prevent interference getting out of the cable.

The standard is that the cable should have the shield connected to pin 2 at both ends. In all equipment pin 2 is grounded at the midi out sockets, including midi through, but pin 2 at the in socket is not connected. This puts a grounded shield over the optoisolated current loop in the cable but does not connect equipment electrically.

sorry, damn nusance isnt it

martin

Hey.

You've received some good responses to your question, so I'll just turn you on to a couple of MIDI resources that you may find useful.

"The MIDI Technical Fanatic's Brainwashing Center" at

"The Urge To Merge" at

Have fun! MIDI is definately a pleasant medium with which one can bring one's music and embedded processing skills together!