XTA DC1048 - Manual (Page 40)

Page 40 DC1048 Integrated Audio Management Operator’s Manual
Isolated connection.
Connect external supply to
between common on switches, and
pin 11 ground only.
Momentary Action
Switch (Mem #01)
+9volts
The GPI Port
Overview
The GPI port is designed for connection to either isolated or non-isolated systems
to facilitate remote memory recalls without the need of a computer. There are
three modes of operation, as defined in the GPI Menu > GPI
GPI GPI GPI via the front panel.
These are explained in the next few pages, but first the difference between
isolated and non-isolated connections.
Pin Number Description
1 – 4 Outputs
Connect to WP-1048 only
5 - 8 Inputs
(0V – off; 2.5V – 10V max = on)
9 Output – +5V
(current limited to 200mA)
10 Output – Chassis Ground
(connect for non-isolated use)
11 - 12 Output – Isolated Ground
(connect only for isolated use)
Isolated Connection
Pin 11 is internally connected to the common cathodes of the opto-isolators and
so to trigger them, this must be joined to the negative side of any external
supply. Chassis ground is NOT connected, nor is the available +5v supply on pin
9. Instead, an external power source provides a voltage, which is switched as
necessary onto the anodes of the opto-isolators triggering memory recalls.