Appendix A Specifications - National Instruments UMI-7774 User Manual

Specifications
Encoder Interface
Limit and Home Switch, Inhibit, Inhibit All, Shutdown,
and General Purpose Digital Inputs
© National Instruments Corporation
The following specifications apply only to the UMI-7774/7772. Consider
the specifications for the National Instruments motion controller you are
using to obtain a complete system specification for the UMI-7774/7772.
Refer to the controller specifications to determine overall system
specifications.
Some signals have compatibility defined as signal pass-through. This
means the UMI-7774/7772 may have passive filtering on these signals,
but the passive filtering does not affect the voltage range or current
handling capability. Consult the motion controller specifications to
determine the allowable voltage range and logic level compatibility of the
signal.
The following specifications are typical for temperatures from 0 to 55 °C
unless otherwise noted.
Inputs...................................................... Quadrature, incremental
Differential input threshold .................... ±0.3 V (typical),
Termination ............................................ 120 Ω
Input voltage range................................. 0 to 5.5 VDC
Max quadrature frequency ..................... 20 MHz
Type ....................................................... Optically isolated, current sinking
Input voltage range................................. 0 to 30 V
Input ON voltage ............................ 3.5 to 30 V
Input OFF voltage ........................... 0 to 2 V
RS-422 compatible
A-1 National Instruments UMI-7774/7772 User Manual
A