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ARCNET PC250

STANDARD MICROSYSTEMS CORPORATION

ARCNET PC250

NIC Type

Arcnet

Chipset

SMC 9026, 9032

Network Transfer Rate

2.5Mbps

Data Bus

8-bit ISA

Topology

Linear Bus/Star

Wire Type

Unshielded twisted pair

Boot ROM

Available

CONNECTIONS

Function

Label

Function

Label

Unshielded twisted pair connector

J1

Unshielded twisted pair connector

J2

INTERRUPT

Setting

JP3

JP4

JP5

JP6

JP7

IRQ2

Closed

Open

Open

Open

Open

IRQ3

Open

Closed

Open

Open

Open

IRQ4

Open

Open

Closed

Open

Open

IRQ5

Open

Open

Open

Closed

Open

IRQ7

Open

Open

Open

Open

Closed

EXTENDED RANGE CONFIGURATION

Response Time

Recon Time

JP1

JP2

75.7 uS

840 mS

Open

Open

 

283.4 uS

1.68 S

Closed

Open

 

561.8 uS

1.68 S

Open

Closed

 

1.1186 mS

1.68 S

Closed

Closed

Note:This setting should only be changed when the length of the ArcNet segments exceed 6000 meters.

NODE ADDRESS

Setting

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

SW1/7

SW1/8

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

5

Off

On

Off

On

On

On

On

On

250

On

Off

On

Off

Off

Off

Off

Off

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

Note: A total of 254 node address settings are available. The switches are a binary representation of the decimal node addresses. SW1/8 is the Most Significant Bit and switch SW1/1 is the Least Significant Bit. The switches have the following decimal values: SW1/8=128, SW1/7=64, SW1/6=32, SW1/5=16, SW1/4=8, SW1/3=4, SW1/2=2, SW1/1=1. Turn off the switches and add the values of the switches that are off to obtain the correct node ID. (Off=1, On=0)

Node addresses 0 and 255 are reserved and should not be used.

BASE I/O ADDRESS

Setting

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

 

000h

On

On

On

On

On

On

 

010h

On

On

On

On

On

Off

 

020h

On

On

On

On

Off

On

 

030h

On

On

On

On

Off

Off

 

040h

On

On

On

Off

On

On

2E0h

Off

On

Off

Off

Off

On

 

3B0h

Off

Off

Off

On

Off

Off

 

3C0h

Off

Off

Off

Off

On

On

 

3D0h

Off

Off

Off

Off

On

Off

 

3E0h

Off

Off

Off

Off

Off

On

 

3F0h

Off

Off

Off

Off

Off

Off

Note: A total of 64 base address settings are available. The switches are a binary representation of the decimal memory addresses. SW1/1 is the Most Significant Bit and switch SW1/6 is the Least Significant Bit. The switches have the following decimal values: SW1/1=512, SW1/2=256, SW1/3=128, SW1/4=64, SW1/5=32, SW1/6=16. Turn off the switches and add the values of the switches that are off to obtain the correct memory address. (Off=1, On=0)

SHARED RAM ADDRESS

Setting

SW2/7

SW2/8

SW2/9

SW2/10

00000h

Off

Off

Off

Off

10000h

Off

Off

Off

On

20000h

Off

Off

On

Off

30000h

Off

Off

On

On

40000h

Off

On

Off

Off

50000h

Off

On

Off

On

60000h

Off

On

On

Off

70000h

Off

On

On

On

80000h

On

Off

Off

Off

90000h

On

Off

Off

On

A0000h

On

Off

On

Off

B0000h

On

Off

On

On

C0000h

On

On

Off

Off

D0000h

On

On

Off

On

E0000h

On

On

On

Off

F0000h

On

On

On

On