Connecting The General Purpose Inputs And Outputs; Figure 2-2: Typical Gpio Circuitry - evertz 8010TM IRIG Instruction Manual

The reading performance of the IRIG reader may be degraded if the phases of a
balanced signal are reversed. Therefore it is preferable to use an unbalanced input
applied to pin 3 in order to eliminate this phase sensitivity.
connected to ground in this case.
2.7.

CONNECTING THE GENERAL PURPOSE INPUTS AND OUTPUTS

The 9 pin PARALLEL I/O connector has 6 general purpose inputs and 2 tally outputs. The GPI inputs
are active low. This means that if you leave an input floating (not connected) then it will not be
activated. Lowering the GPI input to a voltage below 0.8 volts will activate the input. The user can
activate GPIs simply by connecting the GPI input pins to Ground using a button, switch, relay or an
open collector transistor.
The outputs are internally pulled up to 5 volts. Care must be taken to limit the load to 0.5W so there is
no affect on the power supply source in the frame.
Each I/O pin is electrically wired so it can be used as either an input or output. When the pins are used
as inputs, the software turns off the output driver transistor. Figure 2-2 shows the circuitry for each of
the I/O pins.
INSTALLATION
Model 8010TM-IRIG SDI Time Code Master with IRIG Reader Manual
Typical
I/O Pin

Figure 2-2: Typical GPIO Circuitry.

Revision 1.4.1
+ 5 Volts
365 ohm
22 ohm
Pin 2 should be
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