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Chapter 4
Signal Connections
PCI/PXI-1408 and NI-IMAQ for Win95/NT
4-2
©
National Instruments Corporation
Figure 4-2. I/O Connector Pin Assignments
I/O Connector Signal Connection Descriptions
Table 4-1 describes each signal connection on the 25-pin DSUB
connector.
Table 4-1. I/O Connector Signals
Signal Name
Description
VIDEO0±
VIDEO0± allows for a DIFF or RSE connection to video channel 0. To operate in
RSE mode, connect VIDEO0- to GND. When you use or VIDEO0-, you must
disconnect the BNC connector.
VIDEO<3..1>±
VIDEO<3..1>± allows for a DIFF or RSE connection to video channels 1, 2, and 3.
To operate in RSE mode, connect VIDEO- to GND.
PCLKIN±
Use PCLKIN± when the 1408 device is in external lock mode. In this mode, PCLKIN
represents the A/D sampling clock. You can select PCLKIN to be TTL or RS-422 mode,
depending on the jumper W3 configuration. In RS-422 mode, both and
PCLKIN- receive the PCLK signal. The PCLKIN polarity is programmable.
HSYNCIN±
Use HSYNCIN± when the 1408 device is in external lock mode. HSYNC is a
synchronization pulse produced at the beginning of each video scan line that keeps a
video monitor's horizontal scan rate in step with the transmission of each new line.
You can set HSYNCIN in TTL or RS-422 mode depending on jumper W3 configuration.
In RS-422 mode, both and HSYNCIN- receive the HSYNC signal. The
HSYNCIN polarity is programmable.
TRIG0
TRIG1
TRIG2
TRIG3
PCLKIN-/Unused
HSYNCIN-/Unused
VSYNCIN-/Unused
CSYNCIN-/Unused
GND
VIDEO3-
VIDEO2-
VIDEO1-
VIDEO0-/GND
1
2
3
4
5
6
7
8
9
10
11
12
13
CSYNCOUT
GND
GND
+5 V
14
15
16
17
18
19
20
21
22
23
24
25