Measurement-computing USB-4301 Manual do Utilizador descarregar pdf (Página 14)

USB-4301 User's Guide Functional Details

29 INP3

30 GAT3

31 OUT3

32 INP4

33 GAT4

34 OUT4

35 INP5

36 GAT5

37 OUT5

38 GND

50 DO1

51 DO2

52 DO3

53 DO4

54 DO5

55 DO6

56 DO7

48 GND

49 DO0

RSVD

INP1 1

GAT1 2

OUT1 3

INP2 4

GAT2 5

OUT2 6

OSC 7

+5V 8

INT 9

GND 10

RSVD 11

+5V 18

DI CTL 19

GND 20

DI0 21

DI1 22

DI2 23

DI3 24

DI4 25

DI5 26

DI6 27

DI7 28

RSVD

Figure 4. USB-4301 signal pin out

Counter terminals (INP1 to INP5, GAT1 to GAT5, and OUT1 to OUT5)

The counter terminals provide the connections for the clock input signal and gate signal to each counter, and the

output signal from each counter. The clock, gate, and output sources are software-selectable. You can configure

each counter to count up or down.

Digital input (DI0 to DI7) and output (DO0 to DO7) terminals

You can connect up to eight digital input lines to the screw terminals labeled DI0 to DI7 (pins 21 through 28),

and up to eight digital output lines to the screw terminals labeled DO0 to DO7 (pins 49 through 56).

You can use the digital input terminals to detect the state of any TTL level input. Refer to the schematic shown

in Figure 5. When the switch is set to the +5V input, DI7 reads TRUE (1). If you move the switch to GND, DI7

reads FALSE (0).

+5V

GND

Figure 5. Schematic showing switch detection by digital channel DI7

For more information on digital signal connections

For more information on digital signal connections and digital I/O techniques, refer to the Guide to Signal

Connections (available on our web site at www.mccdaq.com/signals/signals.pdf).

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