| ??? 09/13/06 12:07 Read: times |
#124180 - RS485 and DE, \RE |
Hello,
In many RS485 implementations, the \RE (Receiver enable, active low) is grounded and the DE (Driver Enable) pin is controlled by the microcontroller, in other implementations both the pins are controlled by the microcontroller, which is a better method? I thought by grounding the \RE pin, all the nodes when powered up will always start with the Receiver enabled, and avoid bus contention, but while transmitting a character the same is received by the RS485 device, (and echos on the screen), is there a method to purge the Receive buffer in the UART or is this a inferior way of implementing RS485. Any information on this subject will be highly appreciated. Regards, John. |
| Topic | Author | Date |
| RS485 and DE, \RE | 01/01/70 00:00 | |
| not pantyhose | 01/01/70 00:00 | |
| Thanks Erik | 01/01/70 00:00 | |
| stick to the National and B&B stuff | 01/01/70 00:00 | |
| the worse 485 wiring | 01/01/70 00:00 | |
| automatic termination is the solution | 01/01/70 00:00 | |
| what\'s that? | 01/01/70 00:00 | |
| its simple | 01/01/70 00:00 | |
| Cool! | 01/01/70 00:00 | |
| hmmm | 01/01/70 00:00 | |
| actually very simple | 01/01/70 00:00 | |
| I am still none the wiser | 01/01/70 00:00 | |
| chain | 01/01/70 00:00 | |
| I've got it. | 01/01/70 00:00 | |
| It works, you work out the details | 01/01/70 00:00 | |
| maybe not biasing A&B... | 01/01/70 00:00 | |
| then use a high enough voltage | 01/01/70 00:00 | |
| biassing | 01/01/70 00:00 | |
answers | 01/01/70 00:00 | |
| if you supply via cable... | 01/01/70 00:00 | |
| Transceiver with switchable termination | 01/01/70 00:00 | |
| thanks for the tip! | 01/01/70 00:00 | |
| great.Oliver, just this | 01/01/70 00:00 | |
| it would, but think this through | 01/01/70 00:00 |