Routing Capabilities; Stacking Output Devices; Termination Setting; Control And Monitoring - Klein + Hummel K8-AI8 Bedienungsanleitung

Routing Capabilities

As shipped from the factory, the K8-AO8 will place audio channels 1-8 on outputs 1-8.
The K8 bus contains 16 audio channels, in two groups of 8. The K8 terminal control protocol is capable of
configuring the K8-AO8 to select either the group of channels numbered 1-8 or the group of channels
numbered 9-16 for output. Channel 1 appears on output 1, channel 2 on output 2 and so forth. When
selecting the second group of channels, channel 9 appears on output 1, channel 10 appears on output 2
and so forth.
The first two outputs of the AO8 device can select any stereo pair within the group of channels being
received.

Stacking Output Devices

The K8 bus supports a maximum quantity of 254 devices. Output devices may be daisy chained until the
maximum cable length of 200 meters has been reached. Output devices are passively connected and do
not refresh the K8 audio signal. This architecture has the benefit that a failure of an output device will still
allow audio to pass to the next device in the chain. Daisy chaining devices introduces no delay in the audio
signal.

Termination Setting

All 4 termination switches must be set to "on" when the AO8 is the last device in the K8 chain.
K8 link port connected:
K8 link port not connected:

Control and Monitoring

All devices on the K8 bus may be controlled and monitored through a single RS-485 connection to the AI8
device. The protocol is openly published on
control system programmers. The pinout of the RS-485 port is as follows:
PIN 1 Phantom Ground
PIN 2 Phantom Power
PIN 3 Data A (+)
PIN 4 Data B (-)
PIN 5 Signal Ground
PIN 6-9 Not Used
A limited amount of serial data tunnelling is available between the serial ports on any two devices in the
system. This is useful for passing control data to another system, such as a lighting controller or external
relay box located in the same equipment area as the K8 output box.
The phantom power is used to drive K8 accessories designed to attach to the local control connector, such
as a local volume control wall plate. Phantom power is switched off by default and must be activated
through the control protocol.

Output Level Settings

The AO8 is shipped from the factory to provide a +4 dBu nominal output level with a peak level of +22
dBu. By default, the same signal level fed into an analogue input AI8 will appear at an analogue output
AO8 at the same level.
The output level of an AO8 may be trimmed down to any lower value by using the K8 terminal control
protocol.
K8 Rackmount Family User Manual
Termination Off
Termination On
www.klein-hummel.com
DB9 Female Control Connector
for use by software engineers and
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