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National Instruments Corporation
11
NI PXIe-1435 User Guide
Trigger Characteristics
Number of external trigger I/O lines......................4
Trigger input
Voltage range .................................................0 to 5 V (TTL)
Input high voltage ..................................2.0 V
Input low voltage ...................................0.8 V
Trigger output
Voltage range .................................................0 to 5 V (TTL)
Output high voltage................................3.06 V at 3 mA source
Output low voltage.................................0.55 V at 3 mA sink
Maximum pulse rate ..............................................2 MHz
Input Characteristics
Optically Isolated Inputs
Number of channels ...............................................2
Type........................................................................Current sinking
Input voltage range ................................................0 to 30 V
Input ON voltage............................................3.5 to 30 V
Input OFF voltage ..........................................0 to 2 V
Turn-on current ......................................................7.1 mA (typical)
14 mA (maximum)
Maximum pulse rate ..............................................100 kHz
Minimum pulse detected........................................10
s
Reverse polarity protection ....................................Yes, –30 V
Quadrature Encoder/RS-422 Inputs
Number of channels ...............................................2
Input type ...............................................................Differential or single-ended
Voltage range .........................................................0 to 5.5 VDC
Logic levels
Differential input threshold............................±0.2 V (maximum),
RS-422 compatible
Single-ended input threshold .........................TTL compatible
Input high voltage ..................................2.0 V
Input low voltage ...................................0.8 V
Maximum quadrature count rate............................5 MHz
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