KLING & FREITAG K&F TOPAS - Manual (Page 26)

User's manual System Amplifier K&F TOPAS
KLING & FREITAG GMBH © 2014 Version 3.1 Page 26 of 65
5.6 Control
5.6.1 General Purpose Input/Output (GPIO)
The device has four control inputs (0-10V, variable) and four control outputs (switched, 5V/
open collector, or in the standard configuration: two open collectors and a potential free
GPO). These are located on the rear of the device as clamps (compare to illus. Clamp terminal/
GPIO).
You can assign functions to the control inputs and outputs via the web interface.
5.6.1.1 Control Inputs (GPI)
The GPIs are event driven. A new value is taken over the moment this value has been
changed. When there is multiple access to an internal parameter (i.e. volume) by varying
interfaces (web interface, GPI, front panel and/or remote software), the last selected value is
valid, no matter from which interface it was selected.
The common ground of the GPIO's is connected to the audio ground as well as to PE. During
installation, make sure that you do not build up any ground loops. Transient currents in
ground loops can cause malfunctions or destroy the device.
The control inputs allow for the control of internal conditions with 0-10V signals. This allows
for i.e. a gain control through external systems such as media control units.
5.6.1.2 Control Outputs (GPO)
The control outputs are open collector outputs with a separate supply voltage. This allows for
two operating modes:
• a) Active Mode: The device can directly supply small loads (LEDs, REED-Relais) with up to
5 volts. The outputs are short-circuit-proof.
• b) Open Collector Mode: External voltages of up to 50V can be switched against
ground.
In newer amplifiers, there is a normally open contact in the standard configuration between
the GPO connectors 3 and 4. With this, only three of the four GPO's are available.
A modification to include further connecting options is possible. Further alternatives include
a normally closed contact between the GPO connectors 3 and 4 or four open collector
outputs. For modifications, please contact your Kling & Freitag authorised dealer.