Sound Devices 970, User Manual And Technical Information

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970 User Guide and Technical Information
35
Ext
er
nal Contr
ol
1. Set Setup Menu option
[Remote Control - Rec Start/Stop]
to
Timecode.
2. Make sure that the device that is sending timecode is configured to send station-
ary timecode while stopped and running timecode while recording. To cause the 970
to stop recording when linear timecode signal is absent (disconnected), set Setup Menu option
[Timecode/Sync - Timecode Mode] to Ext TC (LTC Halt) .
3. Some cameras do not send the correct timecode in the first few seconds of a recording, or
they send short bursts of timecode causing the 970 to record short unintentional files or incor-
rect timecode values. The
[Timecode/Sync - Auto Record Hold Off]
feature is designed to
eliminate these issues. When a hold off value is applied, the 970 will begin capturing the mo-
ment timecode begins rolling but will only go into record if a valid timecode signal is present
after the hold off time has elapsed.
The 970 (and many other Sound Devices products, including the rack-mount PIX video recorders)
have
Freerun Auto Mute
and
24h Run Auto Mute
timecode modes. These modes mute timecode
output when the unit in Stopped mode (i.e. not recording or playing back). This allows the unit to
trigger other units with timecode as if they are in a Rec Run timecode mode, while maintaining run-
ning timecode value. ( See “Timecode Modes”, page 24 )
Triggering from external timecode will not cause the 970 to automatically stamp exter-
nal timecode to recorded files. The timecode stamped to files is determined by the setting
[Timecode/Sync - Timecode Mode]
GPIO (General Purpose Input / Output)
The 10-pin Phoenix connector provides six GPIO logic points. These can be used as simple-closure
inputs, and to drive LEDs or relays. The following table lists the pin assignments of the GPIO con-
nector.
Pin Function
- (-) Ground. Provides access to ground for triggering logic-low connections.
1 REC Input. Triggers 970 record.
2 Play Input. Triggers 970 play.
3 Stop Input. Triggers 970 stop.
4 (unused)
5 (unused)
6 REC Output. Activates upon 970 record.
7 Play Output. Activates upon 970 play.
8 Stop Output. Activates upon 970 stop.
+5V +5V DC Output. Constant source of +5V for triggering logic high connections.
GPIO inputs (pins 1, 2, and 3) and GPIO outputs (pins 6, 7, and 8) can be set to “logic high” or “logic
low”. Logic high connections will trigger to the presence of +5V (GPIO input) or 5V when
the function is active (GPIO output). Logic low connections will trigger when connected to ground
(GPIO input) or become connected to ground when the function is active (GPIO output).
To configure GPIO connections as logic high or logic low, access Setup Menu option
[Remote Control - GPIO Inputs]
or
[Remote Control - GPIO Outputs]
.
The GPIO Outputs can be used to drive LEDs with a proper series resistor. Resistor values will vary
from LED to LED, 470 ohms is a good starting point.