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Appendix B Specifications
NI 1450 Series Compact Vision System User Manual B-2 ni.com
TTL Inputs and Outputs
Digital logic levels
TTL Inputs
Number of channels................................2
Maximum pulse rate ...............................2 MHz
Minimum pulse detected ........................200 ns
TTL Outputs
Number of channels................................10
Output voltage range ..............................0 V to 5 V
Maximum pulse rate ...............................2 MHz
Optically Isolated Inputs and Outputs
Isolated (Current Sinking) Inputs
Number of channels................................13
Input voltage range.................................0 V to 30 V
Input ON voltage.............................3.5 V to 30 V
Input OFF voltage............................0 V to 2 V
Turn-on current.......................................4 mA, typical;
7.1 mA, minimum;
14 mA, maximum
(current limited)
Level Minimum Maximum
Input low voltage (V
IL
) 0 V 0.5 V
Input high voltage (V
IH
) 2.2 V 5 V
Output low voltage (V
OL
), at 5 mA 2.4 V —
Output high voltage (V
OH
), at 5 mA — 0.4 V