| ??? 02/03/11 14:49 Read: times |
#180980 - Thanks, Peter.. Responding to: ???'s previous message |
Thanks for the comment. What kind of a hardware did you employ?
Actually hate to parallel MAXs. But no other way. Please comment on the following 1. There cannot be any impedance mismatch /reflections is issue. The frequency, amplitude and method does not depend on any impedance matching. So I am safe there. 2. Input of Max has a schmitt. Input impedence is more than 3K. So If my input voltage is around 7 to -7 then the schmitt trip points are well within limits for level sensing. So I am safe there. 3. Since the output drive of a MAX can drive two MAXs, I am safe there also. 4. If both MAXs transmit at the same time, the series resistor should limit the current. Considering that the current would be pulsed and that MAX has built-in current limiting, this part is covered. 5. If both MAXs transmit at the same time, data would be unusable, and this is the only dangerous part. Please comment. Will help me to know where to expect trouble. |
| Topic | Author | Date |
| Paralleling Max232 output | 01/01/70 00:00 | |
| Revommedation On Paralleling Outputs | 01/01/70 00:00 | |
| Multiple Mux | 01/01/70 00:00 | |
| Adding another brain is another option. | 01/01/70 00:00 | |
| RS232 is *not* a bus | 01/01/70 00:00 | |
| Two UART | 01/01/70 00:00 | |
| how about a hub | 01/01/70 00:00 | |
| Is there really such a beast? | 01/01/70 00:00 | |
| external UARTs | 01/01/70 00:00 | |
| There once was... | 01/01/70 00:00 | |
| use 422/485 | 01/01/70 00:00 | |
| Can work well but big potentials for trouble | 01/01/70 00:00 | |
| Thanks, Peter.. | 01/01/70 00:00 | |
| I didn't employ anything | 01/01/70 00:00 | |
| some comments | 01/01/70 00:00 | |
| You really need reliable protocol | 01/01/70 00:00 | |
| collision detection | 01/01/70 00:00 | |
Collision avoidance | 01/01/70 00:00 |