Logitek Electronic Systems AE-32 Audio Engine - Manual (Page 15)

System Components
Logitek Audio Engine Reference Manual 13
GPI Inputs & Outputs
The AE-C2 Communications Controller provides 15 logic input connections along with 15 relay
closures for external device control. The first 12 relays are on a DB25 connector, the remaining
three on a DB37 connector along with logic inputs.
 TIP: The AE-C2 uses mechanical relays. Exceeding the maximum current will cause
these relays to fail. If connecting the Audio Engine to an incandescent on-air light,
always use an outboard relay to avoid exceeding 500 milliamps.
 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
Audio Engine “Open” Control Protocol
The control protocol of the Audio Engine is “open”. If a user wishes to write software control or to
interface other devices through software control, contact Logitek Electronic Systems for a copy of
the serial protocol.