| ??? 05/16/08 13:06 Read: times |
#154818 - I'd get rid of the "OE" Responding to: ???'s previous message |
Keep in mind that RS485 also (in the conventional sense) does not have a daisy chained OE line. If you were going to implement some type of hardware enable/disable line to run down the bus you better look very hard at using some type of driver to send that signal down the bus as a diff-pair like the RS485 data pair itself. If you try to use a different technology to send this down the bus then the achievable distances between the two signal paths will not match.
I'd get rid of the "OE", but if you insist, use a 485 driver to carry it like Michael suggest. I have made (and seen) many 485 implementations, but none (so far) with "OE". I have not seen any such, but could visualize the OE being a 'leftover' from some RS232 multinode implementation. The FAQ (and the links in it) should be enough to get you going. 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 |