ALLEN & HEATH iDR-4 User's Guide download pdf (Page 32)

32 IDR-4 User Guide

Linking iDR Units

Several iDR-4 and iDR-8 units can be daisy chained together such that audio is passed between them

using the 8 channel expander bus. An iDR-in expander can be added to the first unit in the chain, and

an iDR-out expander can be added to the last unit. This provides a flexible solution for complex

installations, for example one where each floor of a building has its own iDR with local inputs and

outputs but have common audio such as global announcements and alarm messages passing through

all. The units can be up to 250 metres apart. Each unit requires its own iDR System Manager session

for configuration.

Master / Slave When iDR-4 units are linked one

becomes the master and the others the slaves. This is so that

they synchronise their audio communication. The first iDR in

the chain automatically becomes the master. However, this is

not the case in a ‘loop back’ system where the audio from the

last unit is linked back into the first unit. Here, you need to

force one unit to become the master. This is described later.

Master /slave status can be checked using the front panel *8

Diagnostics menu items ‘Locked’, Sync Slave’ and ‘Forced

Mstr’. To view these the face plate needs to be removed. The

iDR-8 has additional status indicators as shown here. The

slave LED lights (*8 Sync Slave: YES) when the unit is

assigned as a slave. The ext sync lock LED lights when audio

is being correctly synchronised between the units (*8 Locked:

YES). Both LEDs are off if the unit is the master.

Daisy chained units This example shows two iDR-4

units chained together and including the audio expanders.

Unit A becomes the sync master, Unit B the slave. The CAT5

cable between them connects 8 channels of audio. These can

be selected from any combination of channels using the

source patchbays. Any of the Unit A inputs can be routed

through the patchbay to Unit B. The DR-Link connection is

only required for the expanders. Note that they should connect

to the associated iDR-4 units. The audio monitor is daisy

chained from Unit A to Unit B so that the last unit can be used

to listen to any signal in any unit. Note that each unit must

have its own session of iDR System Manager running for

configuration and audio monitoring.

ext

sync

lockslave 96k

ext

sync

lockslave 96k

ext

sync

lockslave 96k

MASTER

SLAVE

NO SYNC

OUT

iDR-in

14 13 12 11 10 9 8 7 IN

DR-LINK

iDR-out

12 11 10 9 8 7 6 5 OUT

DR-LINK

AUDIO

INOUT

SYNC MASTER

IN OUT

iDR-4 - A

SYNC SLAVE

IN OUT

iDR-4 - B

DR-LINK

8 CHANNELS FROM 14 INPUTS AUDIO MONITOR

1234

LOCAL OUTPUTS

AMPLIFIER

1516

1234INOUT

*8 Diagnostics

Sync Slave: NO

*8 Diagnostics

Locked: NO

*8 Diagnostics

Sync Slave: YES

*8 Diagnostics

Locked: YES

*8 Diagnostics

Sync Slave: YES

*8 Diagnostics

Locked: NO

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ALLEN & HEATH iDR-4 User's Guide Page 32

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