| ??? 05/16/08 14:44 Read: times |
#154824 - get rid of the OE Responding to: ???'s previous message |
The slave devices will all try to send their acknowledgement back. As there can be only one transmitter on the RS-485 line, the device that succeeds to pull its OE line high first will
that will NEVER work. Just visualize that 2 slaves get to the "is OE low" at the exact same time and thus both find that they can set it high BOOOM. get rid of the OE Now the sales guys are asking the Engineering to take out the dip switches and make the slave recognition automatic. discussed in excruciating detail here (just ignore the RF concerns) http://www.8052.com/forumchat/read.phtml?id=153326 and here http://www.8052.com/forumchat/read.phtml?id=154128 Erik |
| Topic | Author | Date |
| RS | 01/01/70 00:00 | |
| Sorry about the subject-- I should ahve typed | 01/01/70 00:00 | |
| how do you expect that to work? | 01/01/70 00:00 | |
| Send slave ID again.. | 01/01/70 00:00 | |
| one transmitter | 01/01/70 00:00 | |
| maybe | 01/01/70 00:00 | |
| Keep in mind that RS485 also... | 01/01/70 00:00 | |
| I'd get rid of the "OE" | 01/01/70 00:00 | |
| I agree | 01/01/70 00:00 | |
| more to add | 01/01/70 00:00 | |
| get rid of the OE | 01/01/70 00:00 | |
| how can slave turn OE line high? | 01/01/70 00:00 | |
| 1 Suggesion to get slave ID | 01/01/70 00:00 | |
| again: OE will not work | 01/01/70 00:00 | |
| OE line connected , but not used | 01/01/70 00:00 | |
| changes | 01/01/70 00:00 | |
| Use ID as timer value | 01/01/70 00:00 | |
Use ID as timer value wil not work ... | 01/01/70 00:00 |