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OUTPUTS AFTER POWER ON OR RESET
REFERENCE > ADVANCED TECHNIQUES >

The analog/digital output states upon instruNet reset or power on are described as follows. For information on how to deal with unexpected power outages and computer crashes, please see Detecting Power Cycling or Computer Crash.

i4xx Cards (not i60x)


  • i4xx Digital I/O
    These are set to inputs upon power-up or reset, and are pulled high via internal 3KΩ resistors. If you are using these as outputs, then your device will see them as a logic 1 upon reset due to this pull up resistor. If you want a digital output bit that is low when i4xx power is off, then click here.
  • i4xx Analog Outputs
    When the i4xx card powers off, these drop to 0V. Upon i4xx power on, they stay at 0V. When the i4xx is auto-calibrated or reset by the host computer, they will also output 0V.

i60x Standalone USB Device


  • i60x Digital I/O
    These are set to inputs upon power-up or reset, and are pulled low via internal 50KΩ resistors. If you are using these as outputs, then your device will see them as a logic 0 upon reset/power-up due to this pull down resistor.

i200 Controller Card


  • i200 Digital Inputs
    These start as inputs upon Reset. They are pulled high via a 10K internal resistor
  • i200 Digital Outputs
    These are driven by the CONTROLLER DIGITAL IN upon Reset, which are pulled high via a 10K resistor. So if nothing is tied to the corresponding CONTROLLER DIGITAL IN, these will start as 1's.

i100 Data Acquistion Box


  • i100 Digital I/O
    These are set to inputs upon power-up or reset, and are pulled high via a 10K resistor. If they are wired as outputs, then they will appear as 1's upon power-up or reset.
  • i100 Analog Outputs
    When the i100 powers off, these drop to 0V. Upon i100 power on, they stay at 0V; yet when the i100 is auto-calibrated or reset by the host computer, they flicker to various levels for approximately 1 sec and then settle at 0V.