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# 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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|----------------------+-------+---------------------+-------|
| Header to connector | J1A | RG-62A/U 93ohm | J2 |
| card | | coaxial connector | |
|----------------------+-------+---------------------+-------|
| 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. |
+------------------------------------------------------------+