National Instruments 1128 用户手册

Table D-1.  Front Connector Signal Description

+5 V(ISO)

Output

+5 VDC isolated source—Powers the 
temperature sensor on the terminal block

GND

Output

Ground

CJS

±

Input

Cold-junction Temperature Sensor Input— 
Connects to the temperature sensor of the 
terminal block

1_WIRE_LO_REF

Input

The common reference signal used in one-wire 
mode

EXT_TRIG_IN

Input

External Trigger Input—Trigger from an 
instrument to advance the switch card to the next 
scan entry

SCANADVD

Output

Scanner Advanced—Trigger to an instrument 
that indicated the switch card has advanced to the 
next scan and relays are debounced

CH<0..63>

± (1-wire)

CH<0..31> ±(2-wire)
CH<0..15>A

±

(4-wire excitation)
CH<0..15>

Β±

(4-wire sense)

Input/Output

Channels—Where signals are connected to the 
switch card. CHx+ and CHx– are switched 
together

OUT0

±

OUT<0..3> (2-wire)
OUT<0..1>A

±

(4-wire excitation)
OUT<0..1>

Β±

(4-wire sense)

Input/Output

Common—The common for each bank

C<0..7>

Input/Output

Columns—Where signal are connected to the 
switch card. The card behaves as a matrix when 
proper external wiring is added

R<0..3>

Input/Output

Rows—Where signals are connected to the 
switch card. In matrix configuration any row 
can be connected to any column