| ??? 07/17/08 01:10 Read: times |
#156783 - Sounds to me like your trying to drive an output. Responding to: ???'s previous message |
Even though you think you are hooked up correctly the symptoms all point to your circuit driving a signal to the modem that comes out of the modem. This may be originally high trying to come out but your circuit is easily able to hold it low. When you raise it high from your end it then is released. When you then power the modem it switches this signal that you are attached to out as a low level. Now your curcuit can no longer easily pull it up.
Really does sound like the classic case of an output connected to an output. Michael Karas |
| Topic | Author | Date |
| Strange "digital" voltages | 01/01/70 00:00 | |
| still have hair left??? | 01/01/70 00:00 | |
| Are you looking at backdriving? | 01/01/70 00:00 | |
| Driver chip | 01/01/70 00:00 | |
| Sometimes, the solution is easy... | 01/01/70 00:00 | |
| Have you washed the board? | 01/01/70 00:00 | |
| SAME modem? | 01/01/70 00:00 | |
| Sounds to me like your trying to drive an output. | 01/01/70 00:00 | |
| DTR current | 01/01/70 00:00 | |
| Quiet in here ? | 01/01/70 00:00 | |
He's busy fixing it! | 01/01/70 00:00 |