| ??? 08/19/06 13:13 Read: times |
#122630 - 485 chip Responding to: ???'s previous message |
Tie DE and /RE to one free port(pin).
While waiting message - pull down this port. When have message to be transmitted - pull up this port, wait a little bit (..5 nop's) , then start transmitting. When message is transmitted - pull down port again ( on some processors it is nasasary to wait some time, before pull down of port.) regards, Stefan |
| Topic | Author | Date |
| 485 connection with 8051 | 01/01/70 00:00 | |
| Why? | 01/01/70 00:00 | |
| yes and no | 01/01/70 00:00 | |
| What?? | 01/01/70 00:00 | |
| That's how one learns things. | 01/01/70 00:00 | |
| 485 connection with 8051 | 01/01/70 00:00 | |
| how to connect pin nos 2(RE) & 3(DE) | 01/01/70 00:00 | |
| I mean | 01/01/70 00:00 | |
| once again | 01/01/70 00:00 | |
| 485 connection with 8051 | 01/01/70 00:00 | |
| Hai | 01/01/70 00:00 | |
| 485 chip | 01/01/70 00:00 | |
| Delay | 01/01/70 00:00 | |
| totally imprecise not enough/too much | 01/01/70 00:00 | |
| Sure | 01/01/70 00:00 | |
which was made before yours! | 01/01/70 00:00 | |
| Sure | 01/01/70 00:00 | |
| ??? | 01/01/70 00:00 | |
| Have you considered reading the datasheets? | 01/01/70 00:00 | |
| have a look at SN75176B | 01/01/70 00:00 | |
| anyone would be foolish attempting 485 | 01/01/70 00:00 |