National Instruments PCI-1200 用户手册
Chapter 3
Signal Connections
3-4
© National Instruments Corporation
The connector pins are grouped into analog input signal pins, analog output
signal pins, digital I/O signal pins, timing I/O signal pins, and power
connections. The following sections describe the signal connection
guidelines for each of these groups.
signal pins, digital I/O signal pins, timing I/O signal pins, and power
connections. The following sections describe the signal connection
guidelines for each of these groups.
40
EXTCONV*
DIO
DGND
External Convert—External control
signal to time A/D conversions (DI) and
drive SCANCLK when you use SCXI
(DO).
signal to time A/D conversions (DI) and
drive SCANCLK when you use SCXI
(DO).
41
OUTB0
DO
DGND
Output B0—Digital output signal of
counter B0.
counter B0.
42
GATB0
DI
DGND
Gate B0—External control signal for
gating counter B0.
gating counter B0.
43
OUTB1
DIO
DGND
Output B1—Digital output signal of
counter B1 (DO). External control
signal for timing a scan interval (DI).
counter B1 (DO). External control
signal for timing a scan interval (DI).
44
GATB1
DI
DGND
Gate B1—External control signal for
gating counter B1.
gating counter B1.
45
CLKB1
DI
DGND
Clock B1—External control clock
signal for counter B1.
signal for counter B1.
46
OUTB2
DO
DGND
Counter B2—Digital output signal of
counter B2.
counter B2.
47
GATB2
DI
DGND
Gate B2—External control signal for
gating counter B2.
gating counter B2.
48
CLKB2
DI
DGND
Clock B2—External control clock
signal for counter B2.
signal for counter B2.
49
+5 V
DO
DGND
+5 Volts—This pin is fused for up to 1 A
of +4.65 to +5.25 V.
of +4.65 to +5.25 V.
* Indicates that the signal is active low.
AI = Analog Input
DI = Digital Input
DIO = Digital Input/Output
AO = Analog Output
DO = Digital Output
N/A = Not Applicable
Table 3-1. Signal Descriptions for PCI-1200 I/O Connector Pins (Continued)
Pin
Signal Name
Direction
Reference
Description