| ??? 05/25/08 14:24 Read: times |
#155094 - Prifibus alike Responding to: ???'s previous message |
Thanks Kai! In cited topic http://www.8052.com/forum/read.phtml?id=127782 there are 2M and 2P5 lines - power supply. I named these lines on my drawing as GNDx and Px. I'm planning P0-GND0=12VDC power supply , produced by master. On FTP cable Cat5 will be 8 ohm on 100 meters segment. Asuuming 6 devices, 50mA each - 2.4V drop on GNDx and 2.4V on Px. I think tranceivers will be still in safe region. Maybe 1-resistor termination at segment's ends will be better than 3-resistors termination. Data rate is slow (<=19,2kb/s). My questions are - if power supply is delivered trough linear regulators (as on drawing) - what kind of problems i must expect. regards |
| Topic | Author | Date |
| RS485 questions | 01/01/70 00:00 | |
| Yes its required | 01/01/70 00:00 | |
| + | 01/01/70 00:00 | |
| you can not achieve isolation .... | 01/01/70 00:00 | |
| + | 01/01/70 00:00 | |
| why common power and isolated 485? | 01/01/70 00:00 | |
| where to get supply | 01/01/70 00:00 | |
| RS485 experiences | 01/01/70 00:00 | |
| all the stuff inside | 01/01/70 00:00 | |
| Prifibus alike | 01/01/70 00:00 | |
| not with '176 | 01/01/70 00:00 | |
| sn75lbc176 planed | 01/01/70 00:00 | |
| why galvanic isolation ? | 01/01/70 00:00 | |
| what is wrong? | 01/01/70 00:00 | |
| then try MAX3158 | 01/01/70 00:00 | |
| how about this little gem? | 01/01/70 00:00 | |
| have you read it fully | 01/01/70 00:00 | |
| It's just another way to get the job done. | 01/01/70 00:00 | |
| OK, I'll bend it in neon | 01/01/70 00:00 | |
| Prifibus alike ..... it isn't | 01/01/70 00:00 | |
| Galavanic isolation | 01/01/70 00:00 | |
| Galavanic isolation | 01/01/70 00:00 | |
| Do it like Profibus | 01/01/70 00:00 | |
| economical approach | 01/01/70 00:00 | |
Thanks for all answers! | 01/01/70 00:00 |