Logitek Electronic Systems Artisan - Manual (Page 20)

Logitek
3
Physical Installation
GPIs
The Artisan Surface has 25 GPI inputs and outputs for control of local studio devices. These GPI
connections are located on the rear of the Artisan Power Supply Unit.
GPI outputs are driven by optically-isolated, non-polarized, solid state switches, rated at 500ma at
50V AC/DC, with surge to 2A. These solid state devices do not conduct at low voltage, so cannot
switch an audio input. However, they are suitable for most control signals, and avoid problems with
relay contacts being damaged by surges. Caution should be exercised to avoid overloading the
switches. If driving a high current device, we recommend driving an external relay or switch.
The GPI inputs are a current source to +5VDC that is pulled to ground to activate. This makes it
suitable for control by push-button, relay or open collector. A diode protects against static and over
voltage. See the wiring diagram for polarity information if using non-standard activation methods.
GPI connectors are on Telco style 50-pin Centronics. As wiring schemes vary from station to station,
these cables are not supplied with the surface, but are available from Logitek Electronic Systems.
They can also be purchased from local suppliers in the required form.
Wiring is straight-through style, with Pair 1 corresponding to GPI #1 and so on. A male AMP style
50-pin connector is required to connect to the Artisan Power Supply Unit. We suggest ordering a
single-ended cable with tails for punch-down to Krone style block or similar. There is one connector
for GPI inputs and another for GPI outputs.
¬ See Appendix B for connector pinouts.
Logitek Artisan Reference Manual 18