| ??? 09/14/06 12:33 Read: times |
#124295 - It works, you work out the details Responding to: ???'s previous message |
I can not reveal proprietary designs, and do not have an idea how to describe this any further without going into that.
I can answer some things: If all the unit's connectors, therefore connections to the bus are identical, why shouldn't all the units see two GNDs? the first and last will only see one. Probably I couldn't understand the case, but, my question would be, for a system of 200 units, do you apply this switching system (relay) to all units just for the sake of comfortibility of automatic termination? Not for "the sake of comfortibility" but because hunting a misswitched terminator cost a service call which is about the same cost as 100 automatic termination circuits. In addition you have the loss of reputation coming from the malfunctiong unit, that it is the customers/installers fault does not make a difference. No, the automatic termination is not for MY comfort, (I do know how to set switches) but for the comfort of knowing the my respected customer can not screw it up. Apart from this, the real headache is biasing in a ever extending RS485 network. Do you have any automatic biasing system solution as bus gets longer in time? I do not understand your question, the syatem works from 2 to 255 nodes. Erik |
| Topic | Author | Date |
| RS485 and DE, \RE | 01/01/70 00:00 | |
| not pantyhose | 01/01/70 00:00 | |
| Thanks Erik | 01/01/70 00:00 | |
| stick to the National and B&B stuff | 01/01/70 00:00 | |
| the worse 485 wiring | 01/01/70 00:00 | |
| automatic termination is the solution | 01/01/70 00:00 | |
| what\'s that? | 01/01/70 00:00 | |
| its simple | 01/01/70 00:00 | |
| Cool! | 01/01/70 00:00 | |
| hmmm | 01/01/70 00:00 | |
| actually very simple | 01/01/70 00:00 | |
| I am still none the wiser | 01/01/70 00:00 | |
| chain | 01/01/70 00:00 | |
| I've got it. | 01/01/70 00:00 | |
| It works, you work out the details | 01/01/70 00:00 | |
| maybe not biasing A&B... | 01/01/70 00:00 | |
| then use a high enough voltage | 01/01/70 00:00 | |
| biassing | 01/01/70 00:00 | |
answers | 01/01/70 00:00 | |
| if you supply via cable... | 01/01/70 00:00 | |
| Transceiver with switchable termination | 01/01/70 00:00 | |
| thanks for the tip! | 01/01/70 00:00 | |
| great.Oliver, just this | 01/01/70 00:00 | |
| it would, but think this through | 01/01/70 00:00 |