Configuration and Installation Chapter 2
SCXI-1160 User Manual 2-17 © National Instruments Corporation
Rear Signal Connector Signal Descriptions
Pin Signal Name Description
24 or 50 DIG GND Digital Ground – Supplies the reference for data
acquisition board digital signals and is tied to the
module digital ground. Pin 50 is for DIO type
boards. Pin 24 is for MIO type boards and jumper
W3 selects it.
25 SERDATIN Serial Data In – Taps into the SCXIbus MOSI line
to provide serial input data to a module or Slot 0.
26 or 47 SERDATOUT Serial Data Out – Taps into the SCXIbus MISO line
to accept serial output data from a module. Pin 47
is for DIO type boards. Pin 26 is for MIO type
boards and jumper W2 selects it.
27 DAQD*/A Data Acquisition Board Data/Address Line – Taps
into the SCXIbus D*/A line to indicate to the
module whether the incoming serial stream is data
or address information.
29 SLOT0SEL* Slot 0 Select – Taps into the SCXIbus INTR* line
to indicate whether the information on MOSI is
sent to a module or to Slot 0.
31 or 37 SERCLK Serial Clock – Taps into the SCXIbus
SPICLK line to clock the data on the MOSI and
MISO lines. Pin 31 is for DIO boards. Pin 37 is for
MIO boards and jumper W4 selects it.
All other pins are not connected.
See the Timing Requirements and Communication Protocol section later in this chapter for more
detailed information on timing.
The signals on the rear signal connector are digital I/O signals. Signal connection guidelines for
each of these groups are given in the following section.
Digital I/O Signal Connections
Pins 24 through 27, 29, 31, 37, 47, and 50 constitute the digital I/O lines of the rear signal
connector. They are divided into three categories–the digital input signals, the digital output
signals, and the digital timing signals.
The digital input signals are pins 24 or 50, 25, 27, 29, and 31 or 37. The data acquisition board
uses these pins to configure the SCXI module that the data acquisition board controls.