Chapter 1
Generating Functions with the NI 5401
©
National Instruments Corporation
1-7
Signal Descriptions
Table 1-1 shows the pin names and signal descriptions used on the NI 5401
digital output connector.
SHC50-68 50-Pin Cable Connector
You can use an optional SHC50-68 50-pin to 68-pin cable for external
trigger input. The cable connects to the digital connector on the NI 5401.
Figure 1-5 shows the 68-pin connector pin assignments on the SHC50-68
cable.
Note
The SHC50-68 connector uses the same signals as the NI 5401 digital output
connector shown in Table 1-1.
Table 1-1.
Digital Connector Signal Descriptions
Signal Name
Type
Description
DGND
—
Digital ground
EXT_TRIG
Input
External trigger—The external trigger input signal is a TTL-level
signal that you can use to start or step through a waveform
generation. For more information on trigger sources and trigger
mode, see Chapter 2,
NC
—
Not connected.
RFU
—
Reserved for future use. Do
not
connect signals to this pin.