AudioArts Engineering D-75 - Ready; Talkback to Control Room; On Tally; Tally B

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D-75 / Sep 2004
STEREO LINE INPUT
To START and STOP Remote Source Machines Using Module ON/OFF
Switches
EXTERNAL START — Hook up the remote machine’s “start” control pins to the
IN-75 module’s DB-25 connector control pins: for START wire to Pins 3 and 5.
EXTERNAL STOP — Hook up the remote machine’s “stop” control pins to the
IN-75 module’s DB-25 connector control pins: for STOP wire to Pins 4 and 5.
These are opto-isolated outputs.
To Control the Module’s OFF Switch LED with an External Source Machine
READY — Hook up the remote machine’s Ready output to the IN-75 module’s
DB-25 connector pin 2 (Ready) and pin 19 (Digital Ground). The module’s Ready port
is looking for a contact closure. As long as the closure is maintained, the module’s OFF
LED illumination will be opposite what it normally is. That is, if the OFF LED is
expected to be lit (module off) the external closure will turn that LED off, whereas if
the OFF LED is expected to be off (module on) the external closure will turn the LED
on. As a result, the OFF LED will flash when a pulse is connected to the Ready input.
Talkback to Control Room
If an IN-75 module is being used for a studio microphone, this connection allows
talkback from that studio to the console operator. Provide a closure between Pin 17
(TB to CR) and Digital Ground (Pin 19). This will cause the module’s pre fader signal
to be sent to the console’s Cue bus, where it may be heard by the console operator. This
non-latching condition continues until the closure is released. (Requires user-supplied
momentary action TALKBACK switch at the studio microphone location.)
On Tally
Lets the module’s channel ON switch control an on-air light or other “microphone
on” indicator at a remote location. This control function provides a continuous closure
to Digital Ground at Pin 15 (On Tally) whenever the module is ON.
This closure can be used to control an externally powered tally light that requires
a continuous closure to function. Or an external tally light (i.e., LED) can be powered
from the input module by connecting the external LED to +5V Digital (Pin 18) and the
On Tally port. In either case the current should not exceed 30 milliamps.
Tally B
Provides a remote indication that the module’s B source has been selected. This
control function provides a continuous closure (open collector) between Pin 6
(Tally B) and Digital Ground (Pins 19) whenever the B source is selected.
This closure can be used to control an externally powered tally light that requires
a continuous closure to function. An external tally light (i.e., LED) can be powered
from the input module by connecting the external LED to +5V Digital (Pin 18) and the
B Tally port. The current should not exceed 30 milliamps.
Note that this output always functions regardless of the REM B setting on the
PR-75. However, you will most likely want to enable B remote logic if you are using
the B Tally.
D-75 / Jan 2008