
SEALEVEL SYSTEMS, INC.

ULTRA-485

Card Type               Serial card
Chip Set                Unidentified
Maximum Onboard Memory  Unidentified
I/O Options             Serial port
Hard Drives supported   None
Floppy drives supported None
Data Bus                8-bit ISA
Card Size               Full-length, full-height

[Image]

         CONNECTIONS

   Function        Label

  Serial Port        P3

                     BASE I/O ADDRESS SELECTION PORT 1

       Setting           SW1/1        SW1/2        SW1/3         SW1/4

         Disabled         On            On           On           On

           238h           Off           On           On           Off

           280h           Off          Off           On           On

           288h           Off          Off           On           Off

           290h           Off          Off          Off           On

           298h           Off          Off          Off           Off

           2E8h           On           Off           On           On

           2F8h           On            On          Off           On

           300h           Off           On          Off           On

           308h           Off           On          Off           Off

           3E8h           On            On          Off           Off

          3F8h           On            On           On           Off

          3220h           On           Off           On           Off

          3228h           On           Off          Off           On

          4220h           On           Off          Off           Off

          4228h           Off           On           On           On

                            SERIAL PORT 1 INTERRUPT SELECTION

   IRQ     E1/A     E1/B     E1/C     E1/D    E1/E     E1/F     E1/G     E1/H     E1/I

      2   Closed    Open     Open     Open    Open     Open     Open     Open     Open

      3    Open    Closed    Open     Open    Open     Open     Open     Open     Open

     4    Open     Open    Closed    Open    Open     Open     Open     Open     Open

      5    Open     Open     Open    Closed   Open     Open     Open     Open     Open

      7    Open     Open     Open     Open    Closed   Open     Open     Open     Open

      10   Open     Open     Open     Open    Open     Closed   Open     Open     Open

      11   Open     Open     Open     Open    Open     Open     Closed   Open     Open

      12   Open     Open     Open     Open    Open     Open     Open     Closed   Open

      15   Open     Open     Open     Open    Open     Open     Open     Open    Closed

                      SERIAL INTERRUPT MODE SELECTION

                   IRQ                                   E2

                   Normal                       Pins 1 & 2 closed

             Shared Interrupt mode               Pins 2 & 3 closed

       None (1K ohm pull-down resistor)          Pins 3 & 4 closed

  Note: When using two adapters and having them share an IRQ, one must be
  set in the shared mode and one must be set to include the 1K ohm
  pull-down resistor.

                    SERIAL PORT RECEIVE MODE SELECTION

                  Function                      Label        Position

     RS-485 driver automatically                 E3         Pins 1 & 2
      enabled/disabled for receiver circuit                   closed

      Request to send receiver circuit            E3         Pins 3 & 4
      enabled (RS-485)                                        closed

      RS-422 enabled for receiver circuit         E3         Pins 5 & 6
                                                              closed

                   SERIAL PORT TRANSMITT MODE SELECTION

                  Function                      Label        Position

     RS-485 driver automatically                 E5         Pins 1 & 2
      enabled/disabled for transmitter                        closed
      circuit

      Request to send transmitter enabled         E5         Pins 3 & 4
      (RS-485)                                                closed

      RS-422 enabled for transmitter              E5         Pins 5 & 6
      circuit                                                 closed

        CONNECTOR PIN ASSIGNMENTS

         MODE                  E4

       EIA-530          Pins 1-10 closed

       SIO-485          Pins 11-20 closed

                             LINE TERMINATION

                      Mode                         Label      Position

  120 ohm termination enabled                      SW2/1         On

  120 ohm termination disabled                     SW2/1        Off

  1K ohm pull-down resistor enabled                SW2/2         On

  1K ohm pull-down resistor disabled               SW2/2        Off

  1K ohm pull-up resistor enabled                  SW2/3         On

  1K ohm pull-up resistor disabled                 SW2/3        Off

  Connect TX+ to RX+ for 2 wire operation          SW2/4         On
  (RS-485)

  Connect TX- to RX- for 2 wire operation          SW2/5         On
  (RS-485)

