NEXUS Digital Audio Routing and Interconnect System

System

Features

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XRI Relay-interface Board

28/14-channel I/O Board with Electronic Relay Points and Optocoupler Inputs

Signalling and remote-start distribution
Control of selected NEXUS functions via switches
Routing of external current consumers or machines
28 galvanically isolated I/Os, freely configurable ports
Configuration with galvanic isolation or common potential

XRI02 Relay-Interface Board

The XRI relay-interface board allows external switches and current consumers to be connected and can also be used for controlling external machines.
The module board provides a maximum of 28 optocoupler inputs with minimum input current plus the same number of semiconductor-relay outputs handling both direct and alternating currents. The number of usable inputs and outputs depends on the number of ports. All inputs and outputs are galvanically isolated from the system. Four contact groups, galvanically isolated from each other, can be configured.
In addition, the XRI allows entirely potential-free contacts to be created by joining neighbouring ports. This will cut the number of available channels in half, i.e. two contacts with common potential become one potential-free contact. This configuration can be made individually for each contact pair using jumpers.
The output function can be controlled from the corresponding inputs or from the system software. In addition, the inputs may be used for controlling routing functions on the NEXUS system (e.g. setting crosspoints).

Ports

A maximum of four 15-pin D-Sub ports is available depending on the actual version:

Inputs: 2 ports (15-pin, female)
Outputs: 2 ports (15-pin, male)

The standard version of the XRI includes two inputs and two outputs providing a total of 2 × 14 inputs and the same number of outputs with common potential. A space-saving version with only one input port and one output port is available as an option; it provides 14 inputs and 14 outputs on a 4-DU front panel.

Switching Voltage

An internal power source is optionally available for the board. The voltage source can be used for querying external switching contacts and for the outputs. The output power is sufficient for controlling current consumers directly:

5 V/400 mA per output
Total power of all outputs (max.): 2 W (5 W on request)
The connector pins can handle currents of up to 2 A (max.)

I/O Applications

The inputs can be triggered by control voltages and be used to query switching contacts. The following modes of operation are supported:

Querying external switching contacts using the internal voltage source.
Querying external switching contacts using an external voltage source.
Querying external control voltages.

Thanks to the optional integrated voltage source, loads can be triggered directly, for example, LEDs or power relays. The outputs of the board can also be used simply as switching outputs. For example, this allows external power sources to be used. The outputs of the XRI03 can be configured for the following applications:

Controlling external loads using the internal voltage source.
Controlling external loads with common potential.
Controlling external loads via an external voltage source.

Options

Two versions of the XRI relay-interface board are available:

4-DU version: 14 inputs and 14 outputs (each group with one common potential)
8-DU version: 2×14 inputs and 2×14 outputs (each group with two common potentials)

The board can optionally be equipped with an internal voltage source (max. power: 5 W).

XRI03 Specifications
Features	14 / 2×14 optocoupler inputs max.
	14 / 2×14 solid-state relay outputs max.
	Depending on the available terminals and their individual assignments, the module board provides a maximum of 28 optocoupler inputs with minimum input current plus the same number of static-relay outputs handling both direct and alternating currents.
Inputs	input voltage	40 V (max.) DC
	input current	2.4 to 2.9 mA (max.)
	input current ON	1 to 1.6 mA
	input current OFF	0.3 to 0.75 mA
	LED-forw. voltage ON	4 V@I_F = 2,9 mA
Outputs	output impedance ON	0.6 to 1 ohm (typ.)
	output impedance OFF	0.5 Gohm (typ.)
	external voltage source
	output voltage	24 V (AC/DC) (recommended)
	output current	500 mA (max.) per output
	output current	2×A (max.) per group/port (14 outputs)
	internal voltage source
	output voltage	5 V
	output current	400 mA (max.) per output
	output power	2 W (max.) for all outputs

Stage Tec Entwicklungsgesellschaft für professionelle Audiotechnik mbH, D-12459 Berlin, Tabbertstr. 10
Phone: +49 30 639902-0, Fax: +49 30 639902-32, , © 2002-2008 Stage Tec Berlin

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