I/O
The Trigger and I/O 1-6 panes are used to interface with the camera's various signal inputs and outputs.
Expanded view of a single I/O port
For the dedicated Trigger I/O pane, the Signals field will only show two values -- Enabled or Disabled.
Otherwise, all other fields within these panes operate identically.
Signal
Used to assign a particular signal from the below table to the input or output port.
| Signal | Function |
|---|---|
| Event 1 1 | Used to tag events within the frame metadata. |
| Event 2 1 | Used to tag events within the frame metadata. |
| Frame Sync | Used to synchronize external devices to the camera's frame clock or vice versa |
| IRIG | Used to synchronize timecodes with an IRIG signal from another device or vice versa |
| Ready | Represents when camera is recording but not yet triggered (active for pre-trigger recording only) |
| Record | Represents when camera is recording (active for both pre and post-trigger recording) |
| Shutter | Represents camera's exposure period |
| Trigger | Used to start and/or stop the recording, dependent on the frame buffer's trigger offset |
Mode
Determines if the port is disabled or what type of input or output it is
| Mode | Description |
|---|---|
| Input | External device drives the input signal low or high |
| Input w/ Pull-Up | External device drives the input signal low or high-impedance (with internal pull-up resistor enabled) |
| Output (Push-Pull) | Camera drives the output signal low or high |
| Open-Drain Output | Camera drives the output signal low or high-impedance (with internal pull-up resistor enabled) |
| Open-Drain Bidirectional | Camera or external device drives the input/output signal low or high-impedance (with internal pull-up resistor enabled) |
Polarity
For the Frame Sync and Trigger signals, this setting determines if the camera reacts to the rising or falling edge of the signal. For all other signals (except IRIG), this settings determines if the signal is active in the High (+5 VDC) state or the Low (0 VDC) state.
| Polarity | Function |
|---|---|
| Active High | Signal will be at 5V when in the active state and 0V in the inactive state |
| Active Low | Signal will be at 0V when in the active state and 5V in the inactive state |
| Rising Edge | Camera reacts to the transition between low and high (0 -> 5V) |
| Falling Edge | Camera reacts to the transition between high and low (5 -> 0V) |
Delay
Sets a delay that can be specified in clock cycles 2, miliseconds, microseconds, or nanoseconds.
When used with input signals, it sets the delay time between when the signal is received from an external source, and when it is processed by the camera.
When used with output signals, it sets the delay time between when the signal is generated from the camera, and when it is output to external devices.
Width
Minimum or maximum signal pulse width parameters are specified in clock cycles 2, miliseconds, microseconds, or nanoseconds.
Minimum width : Sets the minimum pulse width that the signal must be to be accepted. Shorter length signals are ignored.
Minimum width : Sets the mmaximum pulse width that the signal can be to be accepted. Longer length signals are ignored.
Filter
Low-pass filter that instructs the camera to ignore the signal if it occurs more frequently than the value of this setting.
e.g. - if the filter is set to 500Hz, then a 1000Hz signal will only register as 500Hz
Right-clicking on the I/O parameter text fields allows the unit to be changed by selecting the corresponding radio button. Alternatively, typing a new value with a different unit can also be used to change units.
Footnotes
-
Contact Pharsighted support regarding the ability to access event tag data. ↩ ↩2
-
The camera's base clock is 204Mhz resulting in 1 clock cycle =~ 4.9ns. ↩ ↩2