| ??? 12/03/04 16:10 Read: times |
#82470 - bus direction Responding to: ???'s previous message |
The control signals are another matter.
The problem is turning the bus in the 485 transceiver attached to the uC. You can, of course do something “smart” with Tx and a capacitor, but that will only work if you are not running very fast (my app run 460kbaud). Also, if you do not have a noisy environment and run reasonably slow, you can run quite fast in a J1708 configuration, however I am exposed to more noise than Carter has liver pills. All this is, of course, possible if you incorporate a few switches, but then my NoTouch becomes a joke. What I need/want/hope for is an setup that allow an instruction to the field: plug your laptop in, press “run”, wait for ready, unplug laptop, which is easy to do with a full duplex setup. However my cables/plugs are so long/many that switching to full duplex (one more twisted pair, larger connectors), just for ISP, is not economically feasible. Erik |
| Topic | Author | Date |
| RS485 Contention. | 01/01/70 00:00 | |
| 485 ISP | 01/01/70 00:00 | |
| RS485 'U' & ISP | 01/01/70 00:00 | |
| the crux | 01/01/70 00:00 | |
| Flashmagic !!!! | 01/01/70 00:00 | |
| RS485 contention | 01/01/70 00:00 | |
| Cygnal F12x | 01/01/70 00:00 | |
| Reply to Erik | 01/01/70 00:00 | |
| FM< half duplex | 01/01/70 00:00 | |
| Reply to Erik | 01/01/70 00:00 | |
| bus direction | 01/01/70 00:00 | |
| A few comments | 01/01/70 00:00 | |
| comnments on comments | 01/01/70 00:00 | |
| comments^3 | 01/01/70 00:00 | |
| boot NIT | 01/01/70 00:00 | |
An example worth 3E8h words :-) | 01/01/70 00:00 | |
| A fundamental query - Erik | 01/01/70 00:00 | |
| testing | 01/01/70 00:00 | |
| RS 485 Contention | 01/01/70 00:00 | |
| RS485 Contention | 01/01/70 00:00 | |
| Switch ? | 01/01/70 00:00 | |
| RS485 contention | 01/01/70 00:00 | |
| Possible solutions. | 01/01/70 00:00 | |
| Thanks Erik. | 01/01/70 00:00 | |
| SOLUTION | 01/01/70 00:00 | |
| Thanks but thats not the solution | 01/01/70 00:00 |