QUATECH, INC.

SCB-1020

Card Type

Serial controller

Chipset/Controller

NEC

I/O Options

Serial port

Maximum DRAM

N/A

CONNECTIONS

Purpose

Location

Serial port - DB-25

CN1

INTERRUPT SELECT - J1

Setting

Jumper A

Jumper B

Jumper C

Jumper D

Jumper E

Jumper F

IRQ4

open

open

closed

open

open

open

 

IRQ2

closed

open

open

open

open

open

 

IRQ3

open

closed

open

open

open

open

 

IRQ5

open

open

open

closed

open

open

 

IRQ6

open

open

open

open

closed

open

 

IRQ7

open

open

open

open

open

closed

DMA SELECT - J2

DMA

A

B

C

D

E

F

G

H

CH 1 for transmit

closed

open

closed

open

open

open

open

open

CH 3 for receive

open

open

open

open

open

closed

open

closed

 

CH3 for transmit

open

closed

open

open

open

closed

open

closed

 

CH1 for receive

closed

open

open

open

open

open

closed

open

 

CH1 for transmit and receive

closed

open

open

open

closed

open

open

open

 

CH3 for transmit and receive

open

open

open

closed

open

open

open

closed

INTERRUPT MODE

Setting

J3

Use dedicated IRQ

pins 1 & 4 closed

 

Share IRQ with compatible Quatech card

pins 2 & 5, 3 & 6 closed

CHASSIS GROUND

Setting

J4

Chassis ground connected to digital ground

pins 1 & 8 closed

 

Chassis ground provided by computer chassis

pins 1 & 8 open

DTE/DCE SELECT

Setting

J4

DTE configuration

pins 2 & 9, 3 & 10, 4 & 11, 5 & 12, 6 & 13, 7 & 14 closed

 

DCE configuration

pins 2 & 3, 4 & 5, 6 & 7, 9 & 10, 11 & 12, 13 & 14 closed

 

INTERRUPT SOURCE

Setting

J5

From communications controller

pins 1 & 2 closed

 

From DMA terminal count

pins 5 & 6 closed

RTS/CTS MODE

Setting

J5

RTS/CTS connected to CN1

pins 3 & 4, 7 & 8 closed

 

RTS/CTS loopback enabled

pins 3 & 7 closed

TRANSMIT CLOCK SOURCE

Source

J6

Internal

pins 2 & 3 closed

 

External

pins 1 & 2 closed

RECEIVE CLOCK SOURCE

Source

J7

Internal

pins 2 & 3 closed

 

External

pins 1 & 2 closed

-SYNC/IPS SELECT

Source

J8

Intenal synchronization mode sync notification signal enabled

pins 2 & 3 closed

 

External synchronization mode - sync notification signal enabled

pins 1 & 2 closed

 

Asynchronous mode - general purpose signal enabled

pins 1 & 2 closed

SYNCHRONOUS BLOCK TRANSFER COMPATIBILITY

Setting

J9

Block Transfer software compatible

pins 1 & 2 closed

 

Quatech REV A compatible

pins 2 & 3 closed

Note:The location of jumper J9 is not specified in manufacturers documentation.

I/O ADDRESS CONFIGURATION

Base Address

SW1

210h

2, 3, 4, 5 & 7 on

 

0F0h

1, 2 & 7 on

 

Note (1): The address range for the SCB-1020 is from 0 to 3F8h. The switches are a binary representation of the addresses. When a switch is off, the corresponding bit is set to 1 and has the following decimal value: SW1/1=2, SW1/2=1, SW1/3=8, SW1/4=4, SW1/5=2, SW1/6=1, SW1/7=8. SW1/8 is not used and the factory setting should not be altered. The SCB-1020 requires 8 consecutive address locations.