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NI 9754 User Manuall
ESTTL Outputs
Each TTL output channel has a DO pin to connect a device that accepts a digital command signal
from 0 V to 5 V. The eight output channels are internally referenced to COM, so you can use
any of the nine COM lines as a reference for the external signal. Each channel has a pull-down
resistor and includes overcurrent, overvoltage, and short-circuit protection.
Overcurrent Protection
The NI 9754 allows only a specified amount of current for switching output channels or sourcing
the output load. If the NI 9754 goes into an overcurrent state by exceeding the specified
maximum switching frequency or the output load, the power supply begins to drop in voltage
until it completely turns off or the overcurrent condition is removed. When the NI 9754 is in this
state, it can accept new output state data.
Overvoltage Protection
The TTL outputs of the NI 9754 are temporarily protected from +/-30 V one channel at a time.
Continued exposure to overvoltage conditions will degrade the life of the NI 9754.
Digital Output Characteristics
Digital Output Logic Levels at 10 mA loads
High ..................................................................4.0 V to 5.0 V
Low ................................................................... 0.1 V to 0.4 V
Physical Specifications and Characteristics
Weight ...............................................................170 g
Maximum Altitude............................................2000 m
Maximum Ambient Temperature......................70 ºC
Operating Humidity ..........................................10% to 90% RH, noncondensing
Pollution Degree ...............................................2
Ingress Protection .............................................IP40
For indoor use only.
If you need to clean the module, wipe it with a dry towel.
