| ??? 08/31/05 13:29 Modified: 08/31/05 13:34 Read: times |
#100346 - That is exacltly why I always push the u Responding to: ???'s previous message |
Erik, I know that you are doing the things right. But keep in mind, that lots of newbies are here, who very quickly read your recommendation as "We don't need this annyoing series termination, a simple ferrite bead does the same job".
... Transmitting digital signals over a cable is always the work for a master, and maybe it leads to a more reliable solution to recommend the use of series termination, instead of a special ferrite filter design. It is difficult to always separate the answers to the problem (and OP) on hand from the potential global use of them. Thus I always (including this thread) push the use of RS422/RS485 transcievers for ANY signal that leaves the box. Here we are talking about a design that start out with words like "4 layer board" etc. This indicates a carefully thought out and crafted design and I have answered in that vein. Kai, your "terminations" is, in my opinion, just as risky if implemented with "the newbies flying leads" as is the ferrite solution. Anyhow, my point is that the resistors do not terminate to the line impedance, at the transmitter Zout is added and at the receiver Zin is added. Erik |
| Topic | Author | Date |
| driving ribboncabel - ESD precautions | 01/01/70 00:00 | |
| on interconnect | 01/01/70 00:00 | |
| Alternative | 01/01/70 00:00 | |
| comments. | 01/01/70 00:00 | |
| Recommended scheme | 01/01/70 00:00 | |
| 74H? | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| Don't forget series termination | 01/01/70 00:00 | |
| series termination | 01/01/70 00:00 | |
| re: series termination | 01/01/70 00:00 | |
| an, in my opinion, much better way is to | 01/01/70 00:00 | |
| Series termination is the correct method | 01/01/70 00:00 | |
| both? | 01/01/70 00:00 | |
| Series termination prevents overshot | 01/01/70 00:00 | |
| HUH? | 01/01/70 00:00 | |
| Huh Huh? | 01/01/70 00:00 | |
| read the original post | 01/01/70 00:00 | |
| Think about the newbies | 01/01/70 00:00 | |
| That is exacltly why I always push the u | 01/01/70 00:00 | |
| RS485 is a good alternative, indeed | 01/01/70 00:00 | |
| Use a relay driver and sleep well ... | 01/01/70 00:00 | |
ferite bead, series termination, or | 01/01/70 00:00 |