National Instruments DAQ M Series - Manual (Page 61)

Chapter 6 Digital Input and Output
NI 6236 User Manual 6-2 ni.com
Programmable Power-Up States
By default, the digital output lines (P1.<0..3>/PFI <6..9>) are disabled
(high impedance) at power up. Software can configure the board to power
up with the entire port enabled or disabled; you cannot enable individual
lines. If the port powers up enabled, you also can configure each line
individually to power up as 1 or 0.
Refer to the NI-DAQmx Help or the LabVIEW 8.x Help for more
information about setting power-up states in NI-DAQmx or MAX.
Connecting Digital I/O Signals
The DI signals P0.<0..5> and DO signals P1.<0..3> are referenced to
D GND. Figure 6-1 shows P0.<0..5> and P1.<0..3>. Digital input
applications include receiving TTL signals and sensing external device
states, such as the state of the switch shown in the figure. Digital output
applications include sending TTL signals and driving external devices,
such as the LED shown in the figure.