| ??? 09/21/09 09:17 Read: times |
#169004 - Bad idea! Responding to: ???'s previous message |
Gopal Amlekar said:
Have a look at this link: No, I would strongly recommend that you do not even think about such bodges! They do not give you a proper, RS232 compliant interface. The circuit shown assumes that you have a 5V supply available; with only 3V available, you will be operating in (or, at least, dangerously close to) the "undefined" area of the RS232 signal spec. The best you can ever hope with this type of circuit is that they will work most of the time. IMO, there are quite enough things that can go wrong with a "poper" RS232 interface without adding the doubt and uncertainty of a "bodge" circuit like this... |
| Topic | Author | Date |
| RS232/serial port of PC for 3 volt microcontrollers | 01/01/70 00:00 | |
| No | 01/01/70 00:00 | |
| Try searching for: MAX3232 or SP3232 | 01/01/70 00:00 | |
| Transistor level shifter | 01/01/70 00:00 | |
| Availability | 01/01/70 00:00 | |
| only if you have +-12V | 01/01/70 00:00 | |
| For transistor based RS232 | 01/01/70 00:00 | |
| Bad idea! | 01/01/70 00:00 | |
| why do these 'maybe' circuits keep popping up? | 01/01/70 00:00 | |
| Few designs have suitable +/- supplies | 01/01/70 00:00 | |
| More to it than just voltages | 01/01/70 00:00 | |
| Yes of course | 01/01/70 00:00 | |
| because they do mostly "work" most of the time | 01/01/70 00:00 | |
| 'mostly' is never stated | 01/01/70 00:00 | |
| I suspect that it's actually quite high... | 01/01/70 00:00 | |
| If he had the supplies ... | 01/01/70 00:00 | |
| Get from other parts of India | 01/01/70 00:00 | |
| Why would you want to use one of those? | 01/01/70 00:00 | |
| Whats Your preference 3V RS or AT89c2051? | 01/01/70 00:00 | |
| If it's specifically for a PC, is RS232 a good choice? | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 |