Chapter 4
Signal Connections
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National Instruments Corporation
4-3
Signal Description
Table 4-1 describes each signal connection on the 100-pin SCSI-type
connector.
Table 4-1.
I/O Connector Signals
Signal Name
Description
Control<0..3>±
You can use the control lines on the PCI/PXI-1422 to control digital camera
features and timing information. Either static or dynamic, TTL or differential,
signals can be generated on these lines to perform such functions as
generating integration or shutter pulses to the digital cameras.
CTS
Clear to Send is used for RS-232 connections.
Data<0..15>±
Data<0..15>± allows you to connect data up to 16 bits wide in differential
format to the PCI/PXI-1422.
DCD
Data Carrier Detect is used for RS-232 connections.
DSR
Data Set Ready is used for RS-232 connections.
DTR
Data Terminal Ready is used for RS-232 connections.
Enable<A..D>±
The PCI/PXI-1422 can receive any combination of up to four enable signals.
These signals can be either TTL or differential. Examples of camera signals
which might be connected to these pins are frame enable, line enable, even
enable and odd enable. If your camera has a separate field signal, that line
should be connected to Enable C.
External
Trigger<0..3>
External Trigger<0..3> are TTL I/O lines used to start an acquisition or output
to control external events. You can program the triggers to be rising-edge or
falling-edge sensitive. You can also program the triggers to be
programmatically asserted or unasserted similar to the function of a digital
I/O line or to contain internal status signals (by using the onboard events)
or specific pulse widths.
GND
GND is a direct connection to digital ground on the PCI/PXI-1422.
Master
Clock<0..1>±
You can use these two sets of pins to generate a master clock signal for your
digital camera. Possible clock frequencies range from 500 kHz to 40 MHz.
Pixel Clock±
The PCI/PXI-1422 uses the Pixel Clock input as a reference clock to latch the
incoming video data.
RI
Ring Indicator is used for RS-232 connections.
