ALLEN & HEATH Qu-16 User Manual download pdf (Page 16)

Qu-16 MIDI Protocol V1.2 8 CD 29/11/2013 iss.1

Device Connection

Note Qu currently allows only one TCP connection at a time over its Network port.

TCP Client Configuration

Clients should be configured to use TCP port 51325

Active Sensing

Qu supports MIDI Active Sensing over its TCP/IP Ethernet connection to detect connection

status. Qu will send an initial Active Sense byte (FE) once an Ethernet connection is established,

and then once every 300ms or so during any period of inactivity.

Qu also responds to Active Sense If it receives an Active Sense byte it will expect to receive

regular MIDI data from that point onwards (either valid control data, or more Active Sense bytes

during any period of inactivity). If it does not receive any data for 12 seconds, it will close the

Ethernet connection.

Sysex Header Sysex Header

A&H ID Qu-16 mixer Major/Minor version MIDI channel

F0, 00, 00, 1A, 50, 11, 01, 00, 0N

Get System State

An external controller such as an iPad running the Qu-Pad app can use MIDI Sysex messages to

request and receive the current parameter state of the Qu mixer.

REQUEST:

Sysex Header, 10 <iPadFlag>, F7

Where <iPadFlag> = 1 identifies the incoming connection as Qu-pad.

REPLY:

Sysex Header, 11, < BoxID > , < Version > , F7

Where < BoxID > = 1 identifies the outgoing connection as the Qu-16 mixer

< Version > = <Major>,<Minor> = Qu firmware version (7bit data)

Subsequent push of NRPN messages to update current state.

Subsequent End Sync Response:

Sysex Header, 14, F7

If <iPadFlag> is set in the initial request the Qu mixer will expect to receive an Active Sense byte

within 5 seconds. If not, it will close the Ethernet connection. This is how the lost communication

mechanism is enforced for Qu-Pad.

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ALLEN & HEATH Qu-16 User Manual Page 16