I understand the intent of the standard "MIDI Thru' connector, but I am
trying to follow an approach that requires less external gear.

In this case, Doepfer has provided headers on the PCB (printed circuit
board) on the backside of the modules, to allow you to daisy-chain
multiple A-190-(2/3) interfaces together, thus replacing an external
Thru cable with an internal wire. This approach is partially
documented in the PDF's that I referenced.

I will make the cable and test it myself and report back on how it works.

On 01/01/2013 01:37 AM, achtung_999 wrote:
> What you want is a Midi Thru connector. As I can see both the 190-2 and
> 190-3 don't have a Thru connector.
> Best thing you can do is buy an active midi thru box like a Philip Rees or
> so. http://www.philrees.co.uk/products/thruunit.htm
>
>
>
> On Tue, Jan 1, 2013 at 1:32 AM, David Kaiser < dkaiser@... > wrote:
>
>> **
>>
>>
>> I have a A-190-3 USB/Midi to CV interface
>> ( http://www.doepfer.de/a1903.htm) , and recently picked up a A-190-2 Midi
>> to CV interface ( http://www.doepfer.de/a1902.htm) as well.
>>
>> I'm hoping to daisy-chain the serial MIDI data between the two modules,
>> so I can use one MIDI (or USB) cable to my rack, train the 190-3 for one
>> MIDI channel, and train the 190-2 for another MIDI channel, but only use
>> a single MIDI cable as input to my rack for both modules.
>>
>> The Doepfer web site offers an 'excerpt' or single-page of the A-190-3
>> manual (the "p13" PDF). It has two "jumpers" (dual pins), JP5 for MIDI
>> OUT, and JP6 for MIDI In. And it looks that a 2-wire cable can be used
>> for serial transfer like MIDI.
>>
>> In the PDF for the A-190-2, there is one jumper set, JP5, with only two
>> pins. It is labeled for both MIDI IN and MIDI OUT.
>>
>> I'm assuming the serial data used in both devices is raw MIDI
>> (transmit/receive) as you would see through signal analysis of a MIDI
>> cable.
>>
>> Is there a recommended approach to use JP5 (MIDI OUT) from the A-190-3
>> and lead it to only one pin of JP5 on the A-190-2 for MIDI IN purposes
>>
>> In the A-190-3 PDF
>> ( http://www.doepfer.de/a100_man/A190_3_Manual_p13.pdf) one pin of each
>> JP5 and JP6 is marked with a 'T' symbol, and this pin is soldered to the
>> ground plane on the circuit board.
>>
>> Does the A-190-3 module tie the 'T'-marked pins of JP5/JP6 to frame
>> ground through the A-100 System cable
>>
>> Is the frame ground how to make up for the lack of the second wire on
>> the A-190-2
>>
>> I am going to try doing a one-wire daisy chain between the A-190-3 out
>> to the A-190-2. Will it work Has anyone confirmed this
>>
>> Thanks for any help, and have a Happy New Year!
>>
>> David
>>
>>
>>
>
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