M-261 MIDI thru (via jack) module for eurorack / Doepfer A100 system.

From the top down:
tip-ring or ring-tip switch for outputs 4&3
MIDI output jack 4&3
tip-ring or ring-tip switch for outputs 2&1
MIDI output jack 2&1
LED showing input MIDI activity
tip-ring or ring-tip switch for input
MIDI input jack

M-261 is one-to-four MIDI thru module. There are two “standards” for MIDI-through-jack connection, one uses tip-ring, the other ring-tip logic. M-261 can process both types of MIDI input and MIDI outputs. And of course it can be used as simple buffered MIDI converter between tip-ring and ring-tip logic.

Connect input MIDI patch cable and toggle the input switch so that the led blinks when the source device sends midi messages.
Connect some output to the target device and check if it receives MIDI messages. If not, press or release appropriate output switch.
There is no danger of destruction, simply try proprer switch position to make MIDI devices working. At first, the input LED should blink.

Width: 4TE/ 4HP/ 20mm.
Depth: 44mm /1,8″ max.
Current: 20mA max.
Power cable included.

Double check power connection before powering your system please.
„Red strip“ means -12V connector side in Eurorack standards.
In some power distribution systems connector key can be reverted.
In this case cut connector key and plug power connector right way (with respect to red strip) or use different power cable appropriate to your power system.