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               

<gopher://bitreich.org/I/th99/i/S-T/54517-1.png>
   

   +------------------------------------------------------------+
   |                        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    |  Pins 3 & 4 closed   |
   |      |          resistor)           |                      |
   |------------------------------------------------------------|
   | 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     |       |   closed   |
   |   | circuit                           |       |            |
   |---+-----------------------------------+-------+------------|
   |   | Request to send receiver circuit  |  E3   | Pins 3 & 4 |
   |   | enabled (RS-485)                  |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | RS-422 enabled for receiver       |  E3   | Pins 5 & 6 |
   |   | circuit                           |       |   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       |  E5   | Pins 3 & 4 |
   |   | enabled (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)                                |       |          |
   +------------------------------------------------------------+