I/O

The Trigger I/O and I/O 1-6 panes are used to configure the camera's various signal inputs and outputs.

Expanded view of a single I/O port

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 time
Trigger	Used to trigger camera's frame buffer and stop the recording, dependent on the frame buffer's trigger offset

info

For the dedicated Trigger I/O pane, the Signals field will only show two options -- Enabled or Disabled.

Mode

Configure the I/O directionality and circuit configuration mode

Mode	Description
Disabled	I/O is disabled
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 (i.e. +5 VDC) state or the low (i.e. 0 VDC) state.

Polarity	Function
Active High	Signal will high when in the active state and low in the inactive state
Active Low	Signal will low when in the active state and high in the inactive state
Rising Edge	Camera reacts to the transition between low and high
Falling Edge	Camera reacts to the transition between high and low

Pulse Manipluations

Allows users to modify signal characteristics to conform to the requirements and characteristics of external devices. The available manipulations are delay, minimum width, maximum width, and filter.

info

Right-clicking on the pulse manipulation 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.

Delay

Specifies a signal delay in clock cycles ², milliseconds, microseconds, or nanoseconds.

I/O Mode
Input Modes	Sets the delay time between when the signal is received from an external source, and when it is processed by the camera
Output Modes	Sets the delay time between when the signal is generated from the camera, and when it is output to external devices

Min. Width

Specifies a minimum signal pulse width in clock cycles ², milliseconds, microseconds, or nanoseconds.

I/O Mode
Input Modes	Sets the minimum pulse width that the input signal must be to be accepted. Shorter length signals are ignored
Output Modes	Stretches output pulses to be at least the desired minimum pulse width or longer

Max. Width

Specifies a maximum signal pulse width in clock cycles ², milliseconds, microseconds, or nanoseconds.

I/O Mode
Input Modes	Sets the maximum pulse width that the input signal can be to be accepted. Longer length signals are ignored
Output Modes	Truncates output pulses to be the desired maximum pulse width or shorter

info

Frame sync output pulse width is 250ns by default

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

Footnotes

1. Contact Pharsighted support regarding the ability to access event tag data. ↩ ↩²

2. The camera's base clock is 204MHz resulting in 1 clock cycle =~ 4.9ns. ↩ ↩² ↩³