National Instruments NI Vision PCI-1409, Руководство пользователя, Страница: 24 / 40

Chapter 3 Signal Connections
NI PXI/PCI-1409 User Manual 3-6 ni.com
TRIG<3..0> Triggers<3..0> are TTL I/O lines used to start or stop an acquisition or output
an acquisition status. You can program the triggers to be rising- or falling-edge
sensitive. You can also program the triggers to be programmatically asserted or
unasserted, which is similar in function to a digital I/O line, or to contain
specific pulse widths or internal status signals by using the onboard events.
CTRL<3..0>± Use the control lines on the NI PCI-1409 to control camera features and timing
information, such as generating integration or shutter pulses. You can generate
either static or dynamic signals and either TTL or differential signals on these
lines.
DGND DGND is a direct connection to a digital ground on the NI 1409.
CHASSIS_GND CHASSIS_GND is a direct connection to the computer’s chassis, which is
grounded through the power cord.
Table 3-1. I/O Connector Signals (Continued)
Signal Name Description