National Instruments SCXI-1320 User Manual page 121

Front Connector Signal Descriptions
Signal
Pin
A2 CGND
C2 DTEMP
A4 +5 V
C4 MTEMP
A6 SCAL
C6, C8 RSVD
A8, C10, C16, No Connect
C22, C28
A10 EGND3
A12 EX3+
C12 EX3–
A14 CH3+
C14 CH3–
A16 EGND2
A18 EX2+
© National Instruments Corporation
Name
Chassis Ground—This pin is tied to the SCXI chassis.
Direct Temperature Sensor—This pin connects the temperature
sensor to the MCH4+ when the terminal block is configured for
direct temperature connection.
+5 VDC Source—This pin is used to power the temperature sensor
on the terminal block. 0.2 mA of source not protected.
Multiplexed Temperature Sensor—This pin connects the
temperature sensor to the output multiplexer.
Shunt Calibration—This pin is tied to the SCAL bit and is used to
control the SCXI-1321 shunt calibration switch. CMOS/TTL
output; not protected.
Reserved—These pins are reserved. Do not connect any signal to
these pins.
Do not connect any signal to these pins.
Excitation Ground 3—This pin connects to the excitation ground 3
via a 51 kΩ resistor.
Positive Excitation Output 3—This pin is connected to the
excitation channel 3 positive output.
Negative Excitation Output 3—This pin is connected to the
excitation channel 3 negative output.
Positive Input Channel 3—This pin is connected to the input
channel 3 positive input.
Negative Input Channel 3—This pin is connected to the input
channel 3 negative input.
Excitation Ground 2—This pin connects to the excitation ground 2
via a 51 kΩ resistor.
Positive Excitation Output 2—This pin is connected to the
excitation channel 2 positive output.
Appendix D
Description
D-3
SCXI-1121 Front Connector
SCXI-1121 User Manual