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ULTRA-485

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

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 enabled/disabled for receiver circuit

E3

Pins 1 & 2 closed

 

Request to send receiver circuit enabled (RS-485)

E3

Pins 3 & 4 closed

 

RS-422 enabled for receiver circuit

E3

Pins 5 & 6 closed

SERIAL PORT TRANSMITT MODE SELECTION

Function

Label

Position

RS-485 driver automatically enabled/disabled for transmitter circuit

E5

Pins 1 & 2 closed

 

Request to send transmitter enabled (RS-485)

E5

Pins 3 & 4 closed

 

RS-422 enabled for transmitter circuit

E5

Pins 5 & 6 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 (RS-485)

SW2/4

On

Connect TX- to RX- for 2 wire operation (RS-485)

SW2/5

On