National Instruments SCXI-1121 Manuel D’Utilisation

A2 

CGND

Chassis Ground—This pin is tied to the SCXI chassis.

C2

DTEMP

Direct Temperature Sensor—This pin connects the 
temperature sensor to the MCH4+ when the terminal block 
is configured for direct temperature connection.

A4

+5 V

+5 VDC Source—This pin is used to power the 
temperature sensor on the terminal block. 0.2 mA of source 
not protected.

C4

MTEMP

Multiplexed Temperature Sensor—This pin connects the 
temperature sensor to the output multiplexer.

A6

SCAL

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.

C6, C8

RSVD

Reserved—These pins are reserved. Do not connect any 
signal to these pins.

A8, C10, C16, 
C22, C28

No Connect

Do not connect any signal to these pins.

A10

EGND3

Excitation Ground 3—This pin connects to the excitation 
ground 3 via a 51 k

Ω

 resistor.

A12

EX3+

Positive Excitation Output 3—This pin is connected to the 
excitation channel 3 positive output.

C12

EX3–

Negative Excitation Output 3—This pin is connected to the 
excitation channel 3 negative output.

A14

CH3+

Positive Input Channel 3—This pin is connected to the 
input channel 3 positive input.

C14

CH3–

Negative Input Channel 3—This pin is connected to the 
input channel 3 negative input.

A16

EGND2

Excitation Ground 2—This pin connects to the excitation 
ground 2 via a 51 k

Ω

 resistor.

A18

EX2+

Positive Excitation Output 2—This pin is connected to the 
excitation channel 2 positive output.

C18

EX2–

Negative Excitation Output 2—This pin is connected to the 
excitation channel 2 negative output.