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8255/8253 I/O CARD

DECISION COMPUTER INTERNATIONAL CO., LTD.

8255/8253 I/O CARD

Card Type

Data acquisition

Chip Set

NEC 8255

I/O Options

Digital I/O ports (2)

Data Bus

8-bit ISA

CONNECTIONS

Function

Label

Function

Label

Digital I/O port 1 (see pinout below)

CN1

Digital I/O port 2 (see pinout below)

CN2

CN1 PINOUT

Function

Pin

Function

Pin

Ground

1

Channel 1C bit 6

21

Ground

2

Channel 1C bit 7

22

Ground

3

Channel 1C bit 4

23

Channel 1A bit 3

4

Channel 1C bit 5

24

Channel 1A bit 1

5

Channel 1C bit 1

25

Channel 1A bit 2

6

Channel 1C bit 0

26

Clock signal 0 in

7

Channel 1B bit 7

27

Channel 1A bit 0

8

Channel 1C bit 2

28

Gate signal 0

9

Channel 1B bit 6

29

Clock signal 0 out

10

Channel 1C bit 3

30

Clock signal 2 out

11

Channel 1B bit 5

31

Clock signal 2 in

12

Channel 1B bit 0

32

Clock signal 1 in

13

Channel 1B bit 4

33

Gate signal 2

14

Channel 1B bit 1

34

Clock signal 1 out

15

Channel 1B bit 3

35

Gate signal 1

16

Channel 1B bit 2

36

Channel 1A bit 5

17

+5V power

37

Channel 1A bit 4

18

-5V power

38

Channel 1A bit 7

19

+12V power

39

Channel 1A bit 6

20

-12V power

40

CN2 PINOUT

Function

Pin

Function

Pin

Ground

1

Channel 2C bit 7

21

Ground

2

Channel 2C bit 6

22

Ground

3

Channel 2C bit 5

23

Ground

4

Channel 2C bit 4

24

Ground

5

Channel 2C bit 0

25

Ground

6

Channel 2C bit 1

26

Ground

7

Channel 2C bit 2

27

Ground

8

Channel 2B bit 7

28

Ground

9

Channel 2C bit 3

29

Ground

10

Channel 2B bit 6

30

Ground

11

Channel 2B bit 0

31

Ground

12

Channel 2B bit 5

32

Channel 2A bit 0

13

Channel 2B bit 1

33

Channel 2A bit 1

14

Channel 2B bit 4

34

Channel 2A bit 2

15

Channel 2B bit 2

35

Channel 2A bit 3

16

Channel 2B bit 3

36

Channel 2A bit 4

17

+5V power

37

Channel 2A bit 5

18

-5V power

38

Channel 2A bit 6

19

+12V power

39

Channel 2A bit 7

20

-12V power

40

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Counter 0 uses internal clock source

JP1/A

Closed

 

Counter 0 uses external clock source

JP1/A

Open

Counter 1 uses internal clock source

JP1/B

Closed

 

Counter 1 uses external clock source

JP1/B

Open

Counter 2 uses internal clock source

JP1/C

Closed

 

Counter 2 uses external clock source

JP1/C

Open

Base I/O address set to 1B0h

JP2

Closed

 

Base I/O address set to 1F0h

JP2

Open

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

1PA0

Red

On

Channel 1A bit 0 is active

1PA0

Red

Off

Channel 1A bit 0 is not active

1PA1

Red

On

Channel 1A bit 1 is active

1PA1

Red

Off

Channel 1A bit 1 is not active

1PA2

Red

On

Channel 1A bit 2 is active

1PA2

Red

Off

Channel 1A bit 2 is not active

1PA3

Red

On

Channel 1A bit 3 is active

1PA3

Red

Off

Channel 1A bit 3 is not active

1PA4

Red

On

Channel 1A bit 4 is active

1PA4

Red

Off

Channel 1A bit 4 is not active

1PA5

Red

On

Channel 1A bit 5 is active

1PA5

Red

Off

Channel 1A bit 5 is not active

1PA6

Red

On

Channel 1A bit 6 is active

1PA6

Red

Off

Channel 1A bit 6 is not active

1PA7

Red

On

Channel 1A bit 7 is active

1PA7

Red

Off

Channel 1A bit 7 is not active

2PA0

Red

On

Channel 2A bit 0 is active

2PA0

Red

Off

Channel 2A bit 0 is not active

2PA1

Red

On

Channel 2A bit 1 is active

2PA1

Red

Off

Channel 2A bit 1 is not active

2PA2

Red

On

Channel 2A bit 2 is active

2PA2

Red

Off

Channel 2A bit 2 is not active

2PA3

Red

On

Channel 2A bit 3 is active

2PA3

Red

Off

Channel 2A bit 3 is not active

2PA4

Red

On

Channel 2A bit 4 is active

2PA4

Red

Off

Channel 2A bit 4 is not active

2PA5

Red

On

Channel 2A bit 5 is active

2PA5

Red

Off

Channel 2A bit 5 is not active

2PA6

Red

On

Channel 2A bit 6 is active

2PA6

Red

Off

Channel 2A bit 6 is not active

2PA7

Red

On

Channel 2A bit 7 is active

2PA7

Red

Off

Channel 2A bit 7 is not active