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CN120A

CNET TECHNOLOGY, INC.

CN120A

NIC Type

ARCnet

Transfer Rate

2.5Mbps

Data Bus

8-bit ISA

Topology

Linear bus

Wiring Type

RG-62A/U 93ohm coaxial

Boot ROM

Available

NODE ADDRESS

Node

SW2/1

SW2/2

SW2/3

SW2/4

SW2/5

SW2/6

SW2/7

SW2/8

0

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

1

On

Off

Off

Off

Off

Off

Off

Off

2

Off

On

Off

Off

Off

Off

Off

Off

3

On

On

Off

Off

Off

Off

Off

Off

4

Off

Off

On

Off

Off

Off

Off

Off

251

On

On

Off

On

On

On

On

On

252

Off

Off

On

On

On

On

On

On

253

On

Off

On

On

On

On

On

On

254

Off

On

On

On

On

On

On

On

255

On

On

On

On

On

On

On

On

Note:Node address 0 is used for messaging between nodes and must not be used.

A total of 255 node address settings are available. The switches are a binary representation of the decimal node addresses. Switch 1 is the Least Significant Bit and switch 8 is the Most Significant Bit. The switches have the following decimal values: switch 1=1, 2=2, 3=4, 4=8, 5=16, 6=32, 7=64, 8=128. Turn on the switches and add the values of the on switches to obtain the correct node address. (On=1, Off=0)

BOOT ROM

Setting

JP1

Disabled

Open

 

Enabled

Closed

INTERRUPT SELECTION

IRQ

JP2

2/9

Pins 9 & 10 closed

3

Pins 7 & 8 closed

4

Pins 5 & 6 closed

5

Pins 3 & 4 closed

7

Pins 1 & 2 closed

BASE MEMORY ADDRESS & BOOT ROM ADDRESS

Base Address

Boot ROM Address

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

 

C0000h

C2000h

On

On

On

On

On

 

C4000h

C6000h

On

On

Off

On

On

 

CC000h

CE000h

On

On

On

Off

On

D0000h

D2000h

On

On

Off

Off

On

 

D4000h

D6000h

On

On

On

On

Off

 

D8000h

DA000h

On

On

Off

On

Off

 

DC000h

DE000h

On

On

On

Off

On

 

E0000h

E2000h

On

On

Off

Off

Off

I/O BASE ADDRESS

Address

SW1/6

SW1/7

SW1/8

 

260h

On

On

On

 

290h

Off

On

On

2E0h

On

Off

On

 

2F0h

Off

Off

On

 

300h

On

On

Off

 

350h

Off

On

Off

 

380h

On

Off

Off

 

3E0h

Off

Off

Off

DIAGNOSTIC LED(S)

LED

Color

Status

Condition

LED1

Red

Off

Power is not on

LED1

Red

Blinking

Network error

LED1

Red

On

Power is on

LED2

Green

Off

Data is not being transmitted/received

LED2

Green

On

Data is being transmitted/received