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User's manual<br />
System Amplifier K&F TOPAS<br />
5.6 Control<br />
5.6.1 General Purpose Input/Output (GPIO)<br />
The device has four control inputs (0-10V, variable) and four control outputs (switched, 5V/<br />
open collector, or in the standard configuration: two open collectors and a potential free<br />
GPO). These are located on the rear of the device as clamps (compare to illus. Clamp terminal/<br />
GPIO).<br />
You can assign functions to the control inputs and outputs via the web interface.<br />
5.6.1.1 Control Inputs (GPI)<br />
The GPIs are event driven. A new value is taken over the moment this value has been<br />
changed. When there is multiple access to an internal parameter (i.e. volume) by varying<br />
interfaces (web interface, GPI, front panel and/or remote software), the last selected value is<br />
valid, no matter from which interface it was selected.<br />
The common ground of the GPIO's is connected to the audio ground as well as to PE. During<br />
installation, make sure that you do not build up any ground loops. Transient currents in<br />
ground loops can cause malfunctions or destroy the device.<br />
The control inputs allow for the control of internal conditions with 0-10V signals. This allows<br />
for i.e. a gain control through external systems such as media control units.<br />
5.6.1.2 Control Outputs (GPO)<br />
The control outputs are open collector outputs with a separate supply voltage. This allows for<br />
two operating modes:<br />
• a) Active Mode: The device can directly supply small loads (LEDs, REED-Relais) with up to<br />
5 volts. The outputs are short-circuit-proof.<br />
• b) Open Collector Mode: External voltages of up to 50V can be switched against<br />
ground.<br />
In newer amplifiers, there is a normally open contact in the standard configuration between<br />
the GPO connectors 3 and 4. With this, only three of the four GPO's are available.<br />
A modification to include further connecting options is possible. Further alternatives include<br />
a normally closed contact between the GPO connectors 3 and 4 or four open collector<br />
outputs. For modifications, please contact your <strong>Kling</strong> & <strong>Freitag</strong> authorised dealer.<br />
KLING & FREITAG GMBH © 2012 Revision 3.0 Page 26 of 65
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