B & B ELECTRONICS

3PXOCC1A, 3PXOCC1B

Card Type   Serial
Chipset     16550A (3PXOCC1A)

            16750 (3PXOCC1B)
I/O Options Serial port
Data Bus    8/16 bit ISA

[Image]

                                CONNECTIONS

               Function                               Label

  RS-232, RS-422, or RS-485 serial                     J2
  port

                        USER CONFIGURABLE SETTINGS

                   Setting                      Label        Position

  »   RS-485 receiver disabled when             JP3/B        Pins 2 & 3
      transmitting                                            closed

      RS-485 receiver always enabled            JP3/B        Pins 1 & 2
                                                              closed

      RS-485 transmitter enabled on high         JP2         Pins 2 & 3
      RTS only                                                closed

      RS-485 transmitter enabled whenever        JP2         Pins 1 & 2
      transmission is attempted                               closed

  »   Serial port clock speed normal             JP5         Pins 2 & 3
                                                              closed

      Serial port clock speed multiplied by      JP5         Pins 1 & 2
      4                                                       closed

                         SERIAL PORT CONFIGURATION

  Setting    JP1/A    JP1/B    JP1/C    JP1/D     JP2     JP3/A    JP3/B

  RS-232     Pins 2   Pins 2   Pins 2   Pins 2   Pins 2    N/A      N/A
              & 3      & 3      & 3      & 3      & 3

  RS-422     Pins 1   Pins 1   Pins 1   Pins 1    N/A     Pins 1   Pins 1
              & 2      & 2      & 2      & 2               & 2      & 2

  RS-485     Pins 1   Pins 1   Pins 1   Pins 1    See     Pins 2     See
              & 2      & 2      & 2      & 2     note      & 3      note

            Note:For correct settings of JP2 and JP3/B for RS-485 mode,
            see their entries in the User Configurable Settings table.

            Pins designated are in the closed position.

                            INTERRUPT SELECTION

    Setting       JP4/A     JP4/B    JP4/C     JP4/D     JP4/E     JP4/F

      IR/FONT>   Closed     Open      Open      Open     Open      Open

        IRQ3      Open     Closed     Open      Open     Open      Open

  »     IRQ4      Open      Open     Closed     Open     Open      Open

        IRQ5      Open      Open      Open     Closed    Open      Open

        IRQ6      Open      Open      Open      Open    Closed     Open

        IRQ7      Open      Open      Open      Open     Open     Closed

       IRQ10      Open      Open      Open      Open     Open      Open

       IRQ11      Open      Open      Open      Open     Open      Open

       IRQ12      Open      Open      Open      Open     Open      Open

       IRQ14      Open      Open      Open      Open     Open      Open

       IRQ15      Open      Open      Open      Open     Open      Open

                        INTERRUPT SELECTION (CON’T)

     Setting         JP4/G      JP4/H      JP4/I       JP4/J      JP4/K

       IR/FONT>      Open       Open        Open       Open        Open

         IRQ3        Open       Open        Open       Open        Open

  »      IRQ4        Open       Open        Open       Open        Open

         IRQ5        Open       Open        Open       Open        Open

         IRQ6        Open       Open        Open       Open        Open

         IRQ7        Open       Open        Open       Open        Open

        IRQ10       Closed      Open        Open       Open        Open

        IRQ11        Open      Closed       Open       Open        Open

        IRQ12        Open       Open       Closed      Open        Open

        IRQ14        Open       Open        Open      Closed       Open

        IRQ15        Open       Open        Open       Open       Closed

                       SERIAL PORT ADDRESS SELECTION

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

        000h       On      On      On       On      On      On       On

        008h      Off      On      On       On      On      On       On

        010h       On     Off      On       On      On      On       On

        018h      Off     Off      On       On      On      On       On

        020h       On      On      Off      On      On      On       On

        2E8h      Off      On      Off     Off      Off     On      Off
      (COM4:)

        2F8h      Off     Off      Off     Off      Off     On      Off
      (COM2:)

        3D8h      Off     Off      On      Off      Off     Off     Off

        3E0h       On      On      Off     Off      Off     Off     Off

        3E8h      Off      On      Off     Off      Off     Off     Off
      (COM3:)

        3F0h       On     Off      Off     Off      Off     Off     Off

  »     3F8h      Off     Off      Off     Off      Off     Off     Off
      (COM1:)

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