
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

[Image]

                                CONNECTIONS

         Function            Label            Function            Label

  Digital I/O port 1 (see     CN1      Digital I/O port 2          CN2
  pinout below)                        (see pinout below)

                         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

