| ??? 07/04/07 07:13 Modified: 07/04/07 07:14 Read: times |
#141477 - percents Responding to: ???'s previous message |
The "allowable" error depends on many factors, mostly not digital (like distortion on the cable, asymmetry introduced in the level convertors etc.) Slightly below 5% is the theoretical maximum, but the error rate with this would be unbearable. 3% works most of the time with "ideal" connection (short and good cable etc.). 1% should be well on the safe side. 0.16% is simply perfect :-)
Personally, I was using AT89C2051 against a PC in several hundreds of installations with 12MHz crystal and 4800 Bauds (TH1=-13, PCON.7 set), with no complaints (or, to be honest, with a several types of problems always on the PC side... :-( ). Of course, with serial (whether RS232, RS485 or anything else), a packetising/checksumming/retrying protocol is always a good idea. JW PS. Doesn't the derivative you are using, have Timer2, by chance? |
| Topic | Author | Date |
| Can 8051 12mhz baud rate compatible with PC? | 01/01/70 00:00 | |
| Baud Rate Calculator | 01/01/70 00:00 | |
| Isnt true your rate!!! | 01/01/70 00:00 | |
| No tricks | 01/01/70 00:00 | |
| 0.16% 8051 to pc will work ok? | 01/01/70 00:00 | |
| Like it says on the page | 01/01/70 00:00 | |
| percents | 01/01/70 00:00 | |
| Those are tertiary effects, Jan | 01/01/70 00:00 | |
4.5%? | 01/01/70 00:00 | |
| Russell! | 01/01/70 00:00 | |
| Well spotted! | 01/01/70 00:00 |