Logitek Electronic Systems AE-32 Audio Engine - Manual (Page 18)

System Components
Logitek Audio Engine Reference Manual 16
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.
 TIP: The solid state switches used in the GPI inputs and outputs are polarity sensitive. If
you are having difficulty getting your GPIs to work, the first troubleshooting step
should be to check your polarity.
 See Appendix C for connector pinouts.
Audio Engine External Sync
The Audio Engine may be synchronized to an external sample clock, which is connected to the
External Sync
port. The external clock is an alternative to the internally set sample rate. For
example, this would be used if all devices in a facility were to be tied to the same sample-rate and
clock.
When networking Audio Engines using the NetA card, External Sync is highly
recommended.
The only acceptable sync source is AES Silence. The sync source can be the sync output of an
Audio Engine or a master rate clock (preferred) fed into an AES distribution amplifier.
The Audio Engine automatically matches any sample rate of digital inputs from approximately 25
KHz to over 50 KHz. The outputs can be set to sample rates of 32 KHz, 44.1 KHz, and 48 KHz or
locked to an external clock source (at one of these frequencies).
 See Appendix C for connector pinouts.
Audio Engine Reset Button
The Reset button restarts or reboots the Audio Engine using the current configuration and settings.
Reboot time is less than two seconds. The Reset button is also used in conjunction with other
functions, which are activated from the AE-PS Power Supply control panel.
 See Chapter 6 for further details on Engine Resets