Sound Devices PIX 270i - Manual (Page 63)

PIX 270i User Guide and Technical Information
57
Ext
er
nal Contr
ol
Triggering from external timecode will not cause the PIX 270i to automatically stamp ex-
ternal timecode to recorded files. The timecode stamped to files is determined by the setting
[Timecode/Sync - Timecode Mode]
Triggering Recording from SDI Flag Bits
Start and stop flags embedded in the SDI signal from some cameras can be used to
start and stop recording of the PIX 270i. To enable this feature, set Setup Menu option
[Remote Control - Rec Start/Stop] to the SDI Flag option that refers to the manufacturer of the
connected camera. Setup Menu option [Timecode/Sync - Timecode Mode] must also be set to
Ext TC (SDI,HDMI).
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 PIX 270i record.
2 Play Input. Triggers PIX 270i play.
3 Stop Input. Triggers PIX 270i stop.
4 (unused)
5 (unused)
6 REC Output. Activates upon PIX 270i record.
7 Play Output. Activates upon PIX 270i play.
8 Stop Output. Activates upon PIX 270i 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 output +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.