Scxibus Connector Signal Descriptions - National Instruments SCXI-1121 User Manual

Chapter 3 Theory of Operation

SCXIbus Connector Signal Descriptions

Pin
A1, B1, C1, D1, A2,
D2,A3, B3, C3, D3, A4,
D4, A5, B5, C5, D5, A6, D6
B2
C2
C13-C17, A21, B21, C21,
D21
C18
A19
B19
C19
D19
A20, B20, C20, D20
A22, B22, C22, D22
A23, D23
B23
C23
SCXI-1121 User Manual
Signal Name
GUARD Guard—Shields and guards the analog bus lines
from noise.
AB0+ Analog Bus 0+ —Positive analog bus 0 line. Used
to multiplex several modules to one analog signal.
AB0– Analog Bus 0– —Negative analog bus 0 line. Used
to multiplex several modules to one analog signal.
CHSGND Chassis Ground—Digital and analog ground
reference.
RSVD Reserved.
RESET* Reset—When pulled low, reinitializes the module
to its power-up state. Totem pole. Input.
MISO Master-In Slave-Out—Transmits data from the
module to the SCXIbus. Open collector. I/O.
D*/A Data/Address—Indicates to the module whether
address information or data information is being
sent to the module on MOSI. Open collector. I/O.
INTR* Interrupt—Active low. Causes data that is on
MOSI to be written to the Slot-Select Register in
Slot 0. Open collector. Output.
V– Negative Analog Supply— –18.5 to –25 V.
V+ Positive Analog Supply— +18.5 to +25 V.
+5 V +5 VDC Source—Digital power supply.
SPICLK Serial Peripheral Interface (SPI) Clock—Clocks
the serial data on the MOSI and MISO lines. Open
collector. I/O.
MOSI Master-Out Slave-In—Transmits data from the
SCXIbus to the module. Open collector. I/O.
3-4
Description
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