Introduction

MIDI devices are connected together by connecting MIDI cables to their MIDI interfaces.

What is a MIDI interface?

A MIDI interface takes the form of at least one or two, often three 5-pin DIN sockets called Ports (identical physically to the those used with domestic Hi-Fi) situated on the casing (usually the rear) of a MIDI device. They will be marked In, Out, and Thru.

The In Port accepts MIDI messages
The Out Port transmits MIDI data originating from the device
The Thru Port passes on an exact duplicate of the data received at the In port

Where can MIDI interfaces be found?

All MIDI devices have a MIDI interface containing at least 1 In and 1 Out port. Some MIDI devices have multiple In and Out ports, such as computer MIDI interfaces.

Here are some devices that have MIDI interfaces ...

Soundcards
Drum machines
USB computer MIDI interfaces
Keyboards
Synthesisers
Samplers
FX units
Digital mixers

Cables

MIDI connector MIDI cables carry MIDI messages in one direction only. Therefore 2 cables are required to carry messages to and from a device.

Cables terminate with so called 5 Pin Din plugs. Cable length between devices should be restricted to a maximum of 15m to ensure data integrity. It is also advisable not to daisy-chain, via their Thru ports, more than three devices.

View our MIDI system diagram next.