| ??? 05/17/08 12:01 Read: times |
#154840 - how can slave turn OE line high? Responding to: ???'s previous message |
Here you have said
The plan is to pull the master device's OE line high to transmit a hex string like AA 01 CC. After sending this string the master will pull OE line low. This means that the master has switched to receive mode. The slave devices will all have OE line low to start with. That means they are in receive mode. The slave devices will receive AA 01 CC simultaneously. The slave devices will turn the OE line high and switch to transmit mode. NOW the question arises is How is this possible if MASTER has made line OE = LOW (logic 0). how can slave make it to logic 1.?(master portpin will sink the current sourced by slave & keep it to logic 0). |
| 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 |