| ??? 05/25/08 18:44 Read: times |
#155101 - not with '176 Responding to: ???'s previous message |
Maybe 1-resistor termination at segment's ends will be
better than 3-resistors termination. Data rate is slow (<=19,2kb/s). If you use 1 resistor termination, you need "idle safe" transcievers, the '176 is not Asuuming 6 devices, 50mA each - 2.4V drop on GNDx and 2.4V on Px. I think tranceivers will be still in safe region You better check your statements or Ohms law "6 nodes 100m apart" 6*50 = 300ma 8 ohms * 6 = 48 ohms 48 * 0.3 = 14.4V Erik |
| 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 |