TRS/Midi Cable question Meris/DMC/Expression

[p4ul]

Bass brethren, I have ventured, probably very foolishly into midi madness.

My question is, has anyone here made their own [or have any knowledge of]  Midi [5pin] to TRS jack to link a DMC micro to a Meris Enzo?

 

Any known pinout weirdness/issues or is it "standard" issue?

 

 

[bass_dinger]

Midi [5pin] to TRS jack 

 

Such cables do exist, and are available (other suppliers can be found)

 

https://www.amazon.co.uk/kenable-3-5mm-Stereo-Audio-Cable-Black/dp/B00KQUZQ4O/ref=asc_df_B00KQUZQ4O?mcid=9505f24b5e163411afc0646faf38461b&tag=googshopuk-21&linkCode=df0&hvadid=710760400267&hvpos=&hvnetw=g&hvrand=4222002176326608353&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9044980&hvtargid=pla-392235580309&hvocijid=4222002176326608353-B00KQUZQ4O-&hvexpln=0&gad_source=1&th=1

 

This thread https://www.basschat.co.uk/topic/521143-midi-pedal-board/#comment-5602414 has @BigRedX telling me that "MIDI leads despite using 5-Pin DIN connectors only use 3 of the conductors - the centre pin for earth and the two pins immediately either side of that for the data signal. The other two pins are unused."

 

 

 

[BigRedX]

You should be fine with any reputable DIN to 3.5mm TSR jack that is sold as being specifically for MIDI.

 

If you want to make your own use a two core twisted pair and screen cable.

 

Connect the screen to the centre pin (2) of the 5-pin DIN plug and to the sleeve of the 6.5mm jack.

 

Then connect pin 5 of the DIN to the ring of the jack and pin 4 to the tip (pins 4 and 5 are the two directly either side of the centre pin).

 

Pins 1 and 3 of the DIN plug (the outermost 2) are not used.

 

If you are getting earth hum or general MIDI weirdness you might need to experiment with disconnecting the shield at the mini jack end. MIDI devices are supposed to be opto-isolated at the MIDI in socket, but often devices that use mini jacks dispense with this as part of their cost-cutting measures which can lead to problems.

[paul_5]

Be aware though that there are 2 types of MIDI to TRS cable - one has the tip of the TRS going to pin 4 of the MIDI connector and the TRS ring to MIDI pin 5, and the other type has these connections reversed. They are (unsurprisingly) called type A and type B, so I'd check with your kit's manufacturer which one you need. It's not the end of the world if you wire them the wrong way round, as it won't cause any damage.

[BigRedX]

14 minutes ago, paul_5 said:

Be aware though that there are 2 types of MIDI to TRS cable - one has the tip of the TRS going to pin 4 of the MIDI connector and the TRS ring to MIDI pin 5, and the other type has these connections reversed. They are (unsurprisingly) called type A and type B, so I'd check with your kit's manufacturer which one you need. It's not the end of the world if you wire them the wrong way round, as it won't cause any damage.

 

Ans this is exactly why I won't buy MIDI gear with these Mickey Mouse mini jack connectors. As well as the fact that you can't use a decent chunky gig-proof cable with these tiny plugs.

[p4ul]

Thanks for the replies, I have scrounged up a few plugs and cables now so should be able to hack something together with a bit of T&E.

I did search the interschtrumf but got more and more confusing and conflicting results the deeper I went, so came here for some sanity 🧐

 

Allegedly M'lud, for Meris The cable MIDI > TRS should be soldered like this: Pin 5 > Tip - Pin 2 > Shield - Pin 4 disconnected. We shall see.

If I work it out will post the results here.

[BigRedX]

34 minutes ago, p4ul said:

Allegedly M'lud, for Meris The cable MIDI > TRS should be soldered like this: Pin 5 > Tip - Pin 2 > Shield - Pin 4 disconnected. We shall see.

 

That sounds like all kinds of wrong, but if that information has come from the manufacturer...

 

The original MIDI spec uses the pins 4 and 5 to transmit the data and pin 2 is a ground/shield for the data transmission, but is generally disconnected at the input end of a MIDI link to prevent ground loops between the audio and data connections.

 

Edit: Just had a look at the Meris device in question. It looks as though it uses a quarter-inch jack for the MIDI connection which is a slight plus, but even though there is probably room for a proper DIN socket for the MIDI in they have elected to use a jack so it can be dual function: expression pedal or MIDI. What do you do if you want to use an expression pedal and have external MIDI control?

Edited 1 hour ago by BigRedX