DECISION COMPUTER INTERNATIONAL CO., LTD.

8 CHANNEL RELAY OUTPUT/PHOTO-ISOLATOR

Card Type            Data acquisition
Chip Set             NEC 8255
I/O Options          Opto-isolated input and relay control output port
Data Bus             8-bit ISA

[Image]

                                CONNECTIONS

                Function                               Label

  Opto-isolated input and relay control                 CN1
  output port

                            CN1 PINOUT

         Function           Pin           Function           Pin

  Channel 1 relay open       1     Channel 4 relay open      20

  Channel 1 relay common     2     Channel 4 relay common    21

  Channel 1 relay closed     3     Channel 4 relay closed    22

  Channel 2 relay open       4     Channel 5 relay open      23

  Channel 2 relay common     5     Channel 5 relay common    24

  Channel 2 relay closed     6     Channel 6 relay open      25

  Channel 3 relay open       7     Channel 6 relay common    26

  Channel 3 relay common     8     Channel 7 relay open      27

  Channel 3 relay closed     9     Channel 7 relay common    28

  Channel 8 relay open      10     Ground                    29

  Channel 8 relay common    11     Channel 1 negative        30

  Channel 1 positive        12     Channel 2 negative        31

  Channel 2 positive        13     Channel 3 negative        32

  Channel 3 positive        14     Channel 4 negative        33

  Channel 4 positive        15     Channel 5 negative        34

  Channel 5 positive        16     Channel 6 negative        35

  Channel 6 positive        17     Channel 7 negative        36

  Channel 7 positive        18     Channel 8 negative        37

  Channel 8 positive        19

                          OPTO-ISOLATION OPTIONS

          Setting                     JPxA                   JPxB

   Differential signals (+     Pins 1 & 2 closed      Pins 2 & 3 closed
           and -)

   Single-ended signals (+     Pins 1 & 2 closed      Pins 1 & 2 closed
          and GND)

  Single-ended signals, TTL    Pins 2 & 3 closed             N/A
           levels

            Note:The exact locations of JP1A through JP8A and JP1B
            through JP8B are unidentified. JP1A and JP1B control the
            opto-isolation functions of channel 1. The settings for JP2A
            through JP8A and JP2B through JP8B are identical, controlling
            channels 2 through 8 respectively.

                             BASE I/O ADDRESS

  Setting   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

      000h   On      On      On      On      On      On      On      On

      004h   On      On      On      On      On      On      On     Off

      008h   On      On      On      On      On      On     Off      On

      010h   On      On      On      On      On     Off      On      On

      014h   On      On      On      On      On     Off      On     Off

  »   2A8h   Off     On      Off     On     Off      On     Off      On

      3ECh   Off     Off     Off     Off    Off      On     Off     Off

      3F0h   Off     Off     Off     Off    Off     Off      On      On

      3F4h   Off     Off     Off     Off    Off     Off      On     Off

      3F8h   Off     Off     Off     Off    Off     Off     Off      On

      3FCh   Off     Off     Off     Off    Off     Off     Off     Off

            Note: Over 255 base address settings are available. The
            switches are a binary representation of the decimal memory
            addresses. SW1/1 is the Most Significant Bit and switch SW1/8
            is the Least Significant Bit. The switches have the following
            decimal values: SW1/1=512, SW1/2=256, SW1/3=128, SW1/4=64,
            SW1/5=32, SW1/6=16, SW1/7=8, SW1/8=4. Turn off the switches
            and add the values of the switches that are off to 512 to
            obtain the correct memory address. (Off=1, On=0)

                    DIAGNOSTIC LED(S)

            The functions of the LEDs are unidentified.