| ??? 05/17/05 07:39 Read: times |
#93521 - How do you know it won't work. Responding to: ???'s previous message |
Michael, calm down. I have already stated my limitation, no more PCB space. This is not something that I can control. If I could have it, I would install 100 laptop there and network them using with TCPIP. Problems gone.l
Everyone wants to design a perfect system. One that follows rules, protocols, standards etc. This is often not possible given the time constraint. I am looking for a solution which is fast, easy to implement without much hardware change. The thread would already have ended if I decide to make a 485 link. Futhermore, repeaters need to be install after every 30 devices. This increase cost too. As stated, why won't a transistor work? Seems logical to me. It will make the line tri-state, just like P0.x. This way, the "sleeping" slaves will not overload the "active transmitting" slave. Let me put it in another way. I use Port1.0, put in base of NPN transistor. transistor(C) -- 10k -- 5V. (E) to gnd. I have 100 of these 8051 configured. I link all the (C) together. When one of the 8051 Port1.0 = 1, the output (C) will be low. Port1.0 =0, (C) will be high. Does it not behave in this way? |
| Topic | Author | Date |
| Uart Automatic Address Recognition | 01/01/70 00:00 | |
| Can't you... | 01/01/70 00:00 | |
| SADDR and SADEN | 01/01/70 00:00 | |
| For This Application You Will Need.... | 01/01/70 00:00 | |
| Using RS485 | 01/01/70 00:00 | |
| Reasearch | 01/01/70 00:00 | |
| a comments | 01/01/70 00:00 | |
| Fan Out? | 01/01/70 00:00 | |
| Token Ring | 01/01/70 00:00 | |
| You do not have a clue do you..... | 01/01/70 00:00 | |
| How do you know it won't work. | 01/01/70 00:00 | |
| I'm done.... | 01/01/70 00:00 | |
| wrong connection | 01/01/70 00:00 | |
| Just for discussion purpose | 01/01/70 00:00 | |
| But adding your discrete components... | 01/01/70 00:00 | |
| outside of a board | 01/01/70 00:00 | |
| A Pickle | 01/01/70 00:00 | |
| Daisy Blue and Daisy Bell | 01/01/70 00:00 | |
| If you can't change it give it up | 01/01/70 00:00 | |
| If all boards had 10K collector pullups. | 01/01/70 00:00 | |
| horsefeathers | 01/01/70 00:00 | |
| Token Ring | 01/01/70 00:00 | |
| make it first, then design it | 01/01/70 00:00 | |
| 8052 serial communication | 01/01/70 00:00 | |
Off-Topic | 01/01/70 00:00 |