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USB-1024LS User's Guide Functional Details

20 CTR

19 GND

18 n/c

17 GND

16 n/c

15 GND

14 n/c

13 n/c

12 GND

11 n/c

10 n/c

9GND

8Port C7

7Port C6

6Port C5

5Port C4

4Port C3

3Port C2

2Port C1

1Port C0

GND 40

GND 31

PC+5V 30

GND 29

Port A7 28

Port B7 39

Port B6 38

Port B5 37

Port B4 36

Port B3 35

Port B2 34

Port B1 33

Port B0 32

Port A6 27

Port A5 26

Port A4 25

Port A3 24

Port A2 23

Port A1 22

Port A0 21

Digital I/O terminals (Port A0 to A7, Port B0 to B7, Port C0 to C7)

Connect up to 24 digital I/O lines to the screw terminal containing pins 1 to 8 (Port C0 to Port C7), pins 21 to

28 (

Port A0 to Port A7), and pins 32 to 39, (Port B0 to Port B7). Refer to the pinout diagram on page 2 for the

location of these pins. You can configure each digital port for either input or output.

When configured for input, you can use the USB-1024LS digital I/O terminals to detect the state of any TTL

level input. Refer to the switch shown in Fi and the schematic shown in . If the switch is set

to the +5 V input, Port A0 reads TRUE (1). If you move the switch to GND, Port A0 reads FALSE.

gure 3-3

Figure 3-3. Digital connection of Port A0 detecting the state of a switch

Figure 3-4

Figure 3-4. Schematic showing switch detection by digital channel Port A0

+5V+GND

Port A0

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).

3-3

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