| ??? 05/16/05 18:41 Read: times |
#93502 - Token Ring Responding to: ???'s previous message |
If your hardware is set in stone, then your only option may be to go to a ring arrangement where the Tx on one connects to the Rx of the next and looping back. Perhaps you could arrange the software to repeat every message before interpreting it, allowing for all units to receive the message. You may even choose to change your approach and go for a token passing arrangement.
100 units must surely take some real estate, you may need a buffer anyway, especially if they are on different boards. If you can add hardware then RS485 is an economical solution from a PCB area point of view since it only requires an 8 pin device. You can even get devices with a fanout of 128 (RS485 standard load is 32) and built in protection (see TI SN75LBC184). Series PTC protection resistors would be a good idea, but you may get away without them. Plus of course termination resistors which you would probably need anyway. |
| Topic | Author | Date |
| Uart Automatic Address Recognition | 01/01/70 00:00 | |
| Can't you... | 01/01/70 00:00 | |
| SADDR and SADEN | 01/01/70 00:00 | |
| For This Application You Will Need.... | 01/01/70 00:00 | |
| Using RS485 | 01/01/70 00:00 | |
| Reasearch | 01/01/70 00:00 | |
| a comments | 01/01/70 00:00 | |
| Fan Out? | 01/01/70 00:00 | |
| Token Ring | 01/01/70 00:00 | |
| You do not have a clue do you..... | 01/01/70 00:00 | |
| How do you know it won't work. | 01/01/70 00:00 | |
| I'm done.... | 01/01/70 00:00 | |
| wrong connection | 01/01/70 00:00 | |
| Just for discussion purpose | 01/01/70 00:00 | |
| But adding your discrete components... | 01/01/70 00:00 | |
| outside of a board | 01/01/70 00:00 | |
| A Pickle | 01/01/70 00:00 | |
| Daisy Blue and Daisy Bell | 01/01/70 00:00 | |
| If you can't change it give it up | 01/01/70 00:00 | |
| If all boards had 10K collector pullups. | 01/01/70 00:00 | |
| horsefeathers | 01/01/70 00:00 | |
| Token Ring | 01/01/70 00:00 | |
| make it first, then design it | 01/01/70 00:00 | |
| 8052 serial communication | 01/01/70 00:00 | |
Off-Topic | 01/01/70 00:00 |