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TC6844 ARC CARD/SE30

THOMAS-CONRAD CORPORATION

TC6844 ARC CARD/SE30

NIC Type

ArcNet

Chip Set

NCR 90C26

Data Bus

Mac SE/30

Network Transfer Rate

2.5Mbps

Topology

Linear Bus

Wiring Type

RG-62A/U 93ohm coaxial

Boot ROM

Not available

CONNECTIONS

Function

Label

Function

Label

Header to connector card

J1A

RG-62A/U 93ohm coaxial connector

J2

Header to main board

J1B

   

EXTENDED RANGE CONFIGURATION

Response Time

Recon Time

JP1

JP2

74.7 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

249

Off

On

On

Off

Off

Off

Off

Off

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

Note: A total of 253 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 address. (Off=1, On=0)

Addresses 0, 254, and 255 are reserved and should not be used.