Chapter 2
Configuration and Installation
© National Instruments Corporation
2-19
SCXI-1162 User Manual
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 when the connector is configured for serial communication. The lines 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. Each
digital line emulates the SCXIbus communication signals as follows:
•
Pin 25 is SERDATIN and is equivalent to the SCXIbus MOSI serial data input line.
•
Pin 27 is DAQD*/A and is equivalent to the SCXIbus D*/A line. It indicates to the module
whether the incoming serial stream on SERDATIN is data (DAQD*/A = 0) or address
(DAQD*/A = 1) information.
•
Pin 29 is SLOT0SEL* and is equivalent to the SCXIbus INTR* line. It indicates whether the
data on the SERDATIN line is being sent to Slot 0 (SLOT0SEL* = 0) or to a module
(SLOT0SEL* = 1).
•
Pin 24 or 50 is the digital ground reference for the data acquisition board digital signals and
is tied to the module digital ground via jumper W3. Pins 24 and 50 are not tied together.
-
Pin 24 is for MIO-type boards with jumper W4 in the MIO position.
-
Pin 50 is for DIO-type boards with jumper W4 in the DIO position.
•
Pin 31 or 37 is SERCLK and is equivalent to the SCXIbus SPICLK line. These pins clock
the serial data on the SERDATIN line into the module registers. Pins 31 and 37 are not tied
together.
-
Pin 31 is for DIO-type boards with jumper W3 in the DIO position.
-
Pin 37 is for MIO-type boards with jumper W3 in the MIO position.
The digital output signal is pin 26 or 47:
•
Pin 26 or 47 is SERDATOUT and is equivalent to SCXIbus MISO when jumper W5 is in
position 1. Pins 26 and 47 are not tied together.
-
Pin 26 is for MIO-type boards with jumper W6 in the MIO position.
-
Pin 47 is for DIO-type boards with jumper W6 in the DIO position.
