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Chapter 2 Connecting Signals
SCXI-1141/1142/1143 User Manual 2-12 ni.com
The digital output signal is pin 26. Pin 26 is SER DAT OUT and is
equivalent to the SCXIbus MISO serial data output line.
The digital I/O signals of the SCXI-1141/1142/1143 module correspond
to the digital I/O lines of an E/M Series DAQ device. Table 2-4 lists the
equivalencies.
The digital timing signals are pins 36 and 43:
• Pin 36 is SCAN CLK, the signal used as a clock for the
SCXI-1141/1142/1143 module multiplexer counter. The DAQ device
pulses this signal at the end of each conversion if the module is in
multiplexed mode.
• Pin 43 is a reserved digital input.
Table 2-4. SCXIbus to SCXI-1141/1142/1143 Module Rear Signal Connector
to DAQ Device Pin Equivalencies
SCXIbus Line
SCXI-1141/1142/1143
Rear Signal Connector
E/M Series
DAQ Device
MOSI SER DAT IN DIO0
D*/A DAQ D*/A DIO1
INTR* SLOT 0 SEL* DIO2
SPI CLK SER CLK EXT STROBE*
MISO SER DAT OUT DIO4
Note: An * means the signal is asserted low.