STANDARD MICROSYSTEMS CORPORATION

ARCNET PC120

EAGLE TECHNOLOGIES

RX-NET II

NIC Type

ARCnet

Transfer Rate

2.5Mbps

Data Bus

8-bit ISA

Topology

Star

Wiring Type

RG-62A/U 93ohm coaxial

Boot ROM

Available

NODE ADDRESS SELECTION

Node

SW3/1

SW3/2

SW3/3

SW3/4

SW3/5

SW3/6

SW3/7

SW3/8

0

-

-

-

-

-

-

-

-

1

Off

On

On

On

On

On

On

On

2

On

Off

On

On

On

On

On

On

3

Off

Off

On

On

On

On

On

On

4

On

On

Off

On

On

On

On

On

251

Off

Off

On

Off

Off

Off

Off

Off

252

On

On

Off

Off

Off

Off

Off

Off

253

Off

On

Off

Off

Off

Off

Off

Off

254

On

Off

Off

Off

Off

Off

Off

Off

255

Off

Off

Off

Off

Off

Off

Off

Off

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 off the switches and add the values of the off switches to obtain the correct node address. (On=0, Off=1)

INTERRUPT REQUEST SELECTION

IRQ

JP1

JP2

JP3

JP4

JP5

2

Closed

Open

Open

Open

Open

3

Open

Closed

Open

Open

Open

4

Open

Open

Closed

Open

Open

5

Open

Open

Open

Closed

Open

7

Open

Open

Open

Open

Closed

I/O BASE ADDRESS SELECTION

Address

SW2/1

SW2/2

SW2/3

SW2/4

SW2/5

SW2/6

200h

Off

On

On

On

On

On

250h

Off

On

On

Off

On

Off

2A0h

Off

On

Off

On

Off

On

2E0h

Off

On

Off

Off

Off

On

2F0h

Off

On

Off

Off

Off

Off

300h

Off

Off

On

On

On

On

350h

Off

Off

On

Off

On

Off

3E0h

Off

Off

Off

Off

Off

Off

BUFFER ADDRESS SELECTION

Address

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

C0000h

Off

Off

On

On

On

On

C4000h

Off

Off

On

On

On

Off

C8000h

Off

Off

On

On

On

On

CC000h

Off

Off

On

On

Off

Off

D0000h

Off

Off

On

Off

On

On

D4000h

Off

Off

On

Off

On

On

D8000h

Off

Off

On

Off

Off

On

DC000h

Off

Off

On

Off

Off

Off

E0000h

Off

Off

Off

On

On

On

FACTORY CONFIGURED SETTINGS

Switch

Setting

SW1/7

On

SW1/8

On