| ??? 01/20/05 16:02 Read: times |
#85420 - Why all this excitement? Responding to: ???'s previous message |
There's nothing wrong with this circuit! Ok, it has no Schmitt-trigger input, but this really doesn't matter if the baud rate isn't too high, and if this reciever is driven by a proper RS232 driver.
Please don't forget, that most RS232 recievers do violate the old RS232 standards either! If you have a look at datasheet of MAX232E, for instance, you will see the following: Input Threshold Low: +0.8V min, +1.2V typ Input Threshold High: +1.7V typ, +2.4V max So, please keep cool. This is a circuit, that will properly work at low baud rates! Nevertheless I would use a special RS232 transciever. Kai |
| Topic | Author | Date |
| Instead of MAX232 | 01/01/70 00:00 | |
| Dont do this. | 01/01/70 00:00 | |
| I've seen worse! | 01/01/70 00:00 | |
| Hysterisis lacking | 01/01/70 00:00 | |
| pin connectors | 01/01/70 00:00 | |
| The Specs | 01/01/70 00:00 | |
| Check this Kuan | 01/01/70 00:00 | |
| Male/Female? Pin Numbers? - DTE or DCE? | 01/01/70 00:00 | |
| Previous experience | 01/01/70 00:00 | |
| OH NO! NOT AGAIN | 01/01/70 00:00 | |
| Receive-Only | 01/01/70 00:00 | |
| Let's analyse: Why is it wrong? | 01/01/70 00:00 | |
| Why all this excitement? | 01/01/70 00:00 | |
| that's the TTL side | 01/01/70 00:00 | |
| No! | 01/01/70 00:00 | |
| ah-ha! | 01/01/70 00:00 | |
| Then I apologize... | 01/01/70 00:00 | |
| did you mean this | 01/01/70 00:00 | |
| RS232 Bus Input Lines of Receiver | 01/01/70 00:00 | |
| Threshold level | 01/01/70 00:00 | |
| Resistors work too | 01/01/70 00:00 | |
| Rf makes Schmitt-trigger performance | 01/01/70 00:00 | |
| Works for some applications | 01/01/70 00:00 | |
| link, please | 01/01/70 00:00 | |
| found it | 01/01/70 00:00 | |
oh tresting again | 01/01/70 00:00 |