Chapter 2
Connecting the Signals
©
National Instruments Corporation
2-9
SCXI-1502 User Manual
Connecting Thermocouples
Refer to the terminal block installation guide, such as the SCXI-1303, for
information about connecting thermocouples. NI recommends using an
isothermal terminal block, such as the SCXI-1303, for accurate
thermocouple measurements.
Connecting RTDs
Refer to the
SCXI-1581 User Manual
for information about connecting
RTDs and for additional RTD theory.
26
SER DAT OUT
P0.4
Output
Serial data out—this signal taps
into the SCXIbus MISO line to
accept serial output data from a
module.
27
DAQ D*/A
P0.1
Input
Board data/address line—this
signal taps into the SCXIbus D*/A
line to indicate to the module
whether the incoming serial stream
is data or address information.
29
SLOT0SEL*
P0.2
Input
Slot 0 select—this signal taps into
the SCXIbus INTR* line to indicate
whether the information on MOSI
is being sent to a module or Slot 0.
36
SCANCLK
AI HOLD COMP,
AI HOLD
Input
Scan clock—a rising edge indicates
to the scanned SCXI module that
the E/M Series DAQ device has
taken a sample and causes the
module to advance channels.
37
SER CLK
EXTSTROBE*
Input
Serial clock—this signal taps into
the SCXIbus SPICLK line to clock
the data on the MOSI and MISO
lines.
43, 46
RSVD
RSVD
Input
Reserved.
Note
: All other pins are not connected.
Table 2-4.
SCXI-1502 Rear Connector Signals (Continued)
Pin
SCXI
Signal Name
NI-DAQmx
Device Signal
Name
Direction
Description
