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TC6843 ARC-CARD/SE

THOMAS-CONRAD CORPORATION

TC6843 ARC-CARD/SE

Card Type

Network Interface Card

Chip Set

NCR 90C26

NIC Type

ARCnet

Network Transfer Rate

2.5Mbps

Topology

Linear Bus, Star

Wiring Type

RG-62A/U 93ohm coaxial

Data Bus

16-bit Mac SE

CONNECTIONS

Function

Label

Function

Label

Header to transceiver

J1A

RG-62A/U 93ohm coaxial connector

J2

Header to controller

J1B

   

EXTENDED RANGE CONFIGURATION

Response Time

Recon Time

JP1

JP2

74.7 uS

840 mS

Open

Open

 

283.4 uS

1680 mS

Closed

Open

 

561.8 uS

1680 mS

Open

Closed

 

11118.6 uS

1680 mS

Closed

Closed

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

NODE ADDRESS SELECTION

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 memory 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 to obtain the correct node address. (Off=1, On=0)

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