National Instruments PCI-1200 用户手册
Chapter 3
Signal Connections
© National Instruments Corporation
3-3
Table 3-1. Signal Descriptions for PCI-1200 I/O Connector Pins
Pin
Signal Name
Direction
Reference
Description
1-8
ACH<7..0>
AI
AGND
Analog Channel 7 through 0—Analog
input channels 0 through 7.
input channels 0 through 7.
9
AISENSE/AIGND
I/O
AGND
Analog Input Sense/Analog Input
Ground—Connected to AGND in RSE
mode, analog input sense in NRSE
mode.
Ground—Connected to AGND in RSE
mode, analog input sense in NRSE
mode.
10
DAC0OUT
AO
AGND
Digital-to-Analog Converter 0
Output—Voltage output signal for
analog output channel 0.
Output—Voltage output signal for
analog output channel 0.
11
AGND
N/A
N/A
Analog Ground—Analog output ground
reference for analog output voltages.
Bias current return point for differential
measurements.
reference for analog output voltages.
Bias current return point for differential
measurements.
12
DAC1OUT
AO
AGND
Digital-to-Analog Converter 1
Output—Voltage output signal for
analog output channel 1.
Output—Voltage output signal for
analog output channel 1.
13,
50
50
DGND
N/A
N/A
Digital Ground—Voltage ground
reference for the digital signals and the
+5 V supply.
reference for the digital signals and the
+5 V supply.
14-21
PA<7..0>
DIO
DGND
Port A 7 through 0—Bidirectional data
lines for port A. PA7 is the MSB, and
PA0 is the LSB.
lines for port A. PA7 is the MSB, and
PA0 is the LSB.
22-29
PB<7..0>
DIO
DGND
Port B 7 through 0—Bidirectional data
lines for port B. PB7 is the MSB, and
PB0 is the LSB.
lines for port B. PB7 is the MSB, and
PB0 is the LSB.
30-37
PC<7..0>
DIO
DGND
Port C 7 through 0—Bidirectional data
lines for port C. PC7 is the MSB, and
PC0 is the LSB.
lines for port C. PC7 is the MSB, and
PC0 is the LSB.
38
EXTTRIG
DI
DGND
External Trigger—External control
signal to trigger a DAQ operation.
signal to trigger a DAQ operation.
39
EXTUPDATE*
DI
DGND
External Update—External control
signal to update DAC outputs.
signal to update DAC outputs.