MIDI TRS

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A great source of documentation is https://minimidi.world/.

DIN-Jack wiring compliant with the MIDI standard

Jack connector may be TS (tip, sleeve) or TRS (tip, ring and sleeve).

Din pin 2 Din pin 4 Din pin 5
DIN shield current source Current sink
TRS type A Sleeve Ring (c. source) Tip (c. sink) https://www.midi.org/midi-articles/updated-how-to-make-your-own-3-5mm-mini-stereo-trs-to-midi-5-pin-din-cables
TRS Type B Sleeve Tip (c. source) Ring (c. sink) https://www.midi.org/midi-articles/updated-how-to-make-your-own-3-5mm-mini-stereo-trs-to-midi-5-pin-din-cables
Disaster Area 5P-TRS https://www.disasterareadesigns.com/shop/p/5p-trs-pro-midi-cable

DIN-Jack wiring NOT compliant with the MIDI standard

Jack connector may be TS (tip, sleeve) or TRS (tip, ring and sleeve).

Din pin 2 Din pin 4 Din pin 5
Chase Bliss Sleeve not connected Ring (receive) DIN to TRS only (the pedal receives MIDI but sends nothing)
https://shop53002.lemaprod.com/content?c=midi cable wiring&id=25
Disaster Area 5P-CBA Pins 2 and 5 wired through
Requires pin 2 of the controller’s MIDI output to be connected to ground
Disaster Area 5P-QQ Designed to work in voltage mode.
Pins 2 and 5 wired through
Requires pin 2 of the controller’s MIDI output to be connected to ground
Disaster Area MJ-5P MultiJack to MIDI
Disaster Area MJ-CBA DMC MultiJack (tip active) MIDI output to 1/4″ MIDI for Chase Bliss Audio (ring active.)
Disaster Area MultiJack Tip active
Chase Bliss Audio Ring active
Alexander Pedal The pedal requires pin 5 connected to TIP and pin 2 connected to SLEEVE
Meris
Eventide
Strymon

Different types of TS/TRS usage:

[...]But most of these company protocols omit the optical isolation called for in the traditional MIDI input circuit and wire the TRS jack (instead of DIN-5) directly to the computer chip in the pedal.

A few years ago the MIDI Association finally announced their standard for MIDI over TRS. It involved replacing DIN-5 jacks with TRS jacks with a standard wiring protocol AND still utilizing the old MIDI input circuit with optical isolation....

Tip Active (tip send):

Used by Alexander, Meris, Empress, Red Panda, Bondi, and other devices using voltage mode on the jack tip.

Ring Active (ring send):

Used by Chase Bliss Audio and other devices using voltage mode on the jack ring.

Tip and Ring Active:

Provides separate outputs on tip and ring of the control port, enabling two MIDI outputs using a special TRS Insert Cable.

TRS MIDI:

Sets the tip active and pulls the ring terminal high.

Used by Boss, Jackson, Cooper, Swindler and other devices that conform to the MIDI TRS specification.

Also works with our MJ-5P MultiJack to MIDI cable to provide additional standard MIDI outputs from the MIDI Box 4.

Tip Send and Ring Send are both bi-directional

Strymon

Source: http://midibox.org/forums/topic/20709-effect-pedal-midi-on-a-jacksolved/?do=findComment&comment=182165

Strymon uses a proprietary cable.

We follow the same TRS MIDI scheme as Disaster Area and Empress. These do not simply wire the 5 pin DIN connections to the TRS; true MIDI data (post opto-isolator) needs to be sent into the pedal. TIP is MIDI IN, and RING is MIDI OUT.

Our cables here have an opto-isolator in line, and can let you send MIDI into the TRS jack: https://store.strymon.net/midi-exp-cable/

Note that this cable is only one way, and won't let you get MIDI OUT.

MidiBox:

The midibox and midibox2 are just simple current to voltage converters

Usage by manufacturers:

Type A Type B
Arturia X
Novation X
Korg X
Boss
Expert-Sleepers
Meris
Strymon
Alexander Pedals
Disaster Area
IK Multimedia
Akai
Music 1010 X
Lehle X https://blog.lehle.com/2018/06/01/10-facts-you-possibly-didnt-know-about-lehle/
Neunaber

USE "TYPE B" ADAPTER WITH THESE DEVICES

USE "TYPE A" OR "TYPE B" ADAPTER WITH THESE DEVICES

USE "TYPE A" ADAPTER WITH THESE DEVICES

MIDI Hubs

Resources