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3PXOCC1A, 3PXOCC1B

B & B ELECTRONICS

3PXOCC1A, 3PXOCC1B

Card Type

Serial

Chipset

16550A (3PXOCC1A)

16750 (3PXOCC1B)

I/O Options

Serial port

Data Bus

8/16 bit ISA

CONNECTIONS

Function

Label

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

J2

USER CONFIGURABLE SETTINGS

Setting

Label

Position

»

RS-485 receiver disabled when transmitting

JP3/B

Pins 2 & 3 closed

 

RS-485 receiver always enabled

JP3/B

Pins 1 & 2 closed

 

RS-485 transmitter enabled on high RTS only

JP2

Pins 2 & 3 closed

 

RS-485 transmitter enabled whenever transmission is attempted

JP2

Pins 1 & 2 closed

»

Serial port clock speed normal

JP5

Pins 2 & 3 closed

 

Serial port clock speed multiplied by 4

JP5

Pins 1 & 2 closed

SERIAL PORT CONFIGURATION

Setting

JP1/A

JP1/B

JP1/C

JP1/D

JP2

JP3/A

JP3/B

RS-232

Pins 2 & 3

Pins 2 & 3

Pins 2 & 3

Pins 2 & 3

Pins 2 & 3

N/A

N/A

RS-422

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

N/A

Pins 1 & 2

Pins 1 & 2

RS-485

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

Pins 1 & 2

See note

Pins 2 & 3

See 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 (COM4:)

Off

On

Off

Off

Off

On

Off

 

2F8h (COM2:)

Off

Off

Off

Off

Off

On

Off

 

3D8h

Off

Off

On

Off

Off

Off

Off

 

3E0h

On

On

Off

Off

Off

Off

Off

 

3E8h (COM3:)

Off

On

Off

Off

Off

Off

Off

 

3F0h

On

Off

Off

Off

Off

Off

Off

»

3F8h (COM1:)

Off

Off

Off

Off

Off

Off

Off

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)