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# 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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|--------------+-------+-----------------------------+-------|
| Header to | J1A | RG-62A/U 93ohm coaxial | J2 |
| transceiver | | connector | |
|--------------+-------+-----------------------------+-------|
| Header to | J1B | | |
| controller | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RANGE CONFIGURATION |
|------------------------------------------------------------|
| Response Time | Recon Time | JP1 | JP2 |
|----------------------+--------------+-----------+----------|
| ยป | 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. |
+------------------------------------------------------------+