| ??? 02/16/06 15:31 Read: times |
#110152 - +24 volt DC pulse counting with 8 signal |
Dear all, Project: I want to make hardware which can communicate with Single PC.the project is all about taking data from +200 different terminals.Each terminal has 8 signals and 1 Rpm signal.all signals are +24v DC which can be high or low periodically. RPM are variable. I need to send the status of terminals along with the signals status. RPM are a pulse of +24 volt, which pulses 400-500 times each minutes, I am going to use the external interrupt of 89c2051 for counting the RPM and other 8 pins for other 8 signals. While the master will be AT89c51, Topology will be daisy chain of RS485. Is every thing above is O.K. Or do you think, I wont work, or more easy / convinient option. kindly let me know with your ideas Ali Moizi |
| Topic | Author | Date |
| +24 volt DC pulse counting with 8 signal | 01/01/70 00:00 | |
| you shouldn't daisy-chain RS485 | 01/01/70 00:00 | |
| WHY | 01/01/70 00:00 | |
| sorry, me stupid | 01/01/70 00:00 | |
| if you get the details right it certainl | 01/01/70 00:00 | |
| Daisy Chain | 01/01/70 00:00 | |
| The only REAL way to connect RS485 is de | 01/01/70 00:00 | |
| What you need is a PLC | 01/01/70 00:00 | |
| Erik and Jan is it feasible. | 01/01/70 00:00 | |
| already answered: | 01/01/70 00:00 | |
| for pulses counting | 01/01/70 00:00 | |
| Pulse input | 01/01/70 00:00 | |
| +24 pulse through optocoupler | 01/01/70 00:00 | |
| Schmidt and isolate | 01/01/70 00:00 | |
| 4N35 are being used | 01/01/70 00:00 | |
| I know of none such, but follow the opto | 01/01/70 00:00 | |
| 14 is not clear to me | 01/01/70 00:00 | |
| if the links worked I'd have a look | 01/01/70 00:00 | |
| links fixed | 01/01/70 00:00 | |
| 6 pin schmidt Trigger opto/ isolator | 01/01/70 00:00 | |
seems like good choices | 01/01/70 00:00 |