| ??? 01/13/05 00:51 Read: times |
#84900 - If the 2 com ports do not need to run at Responding to: ???'s previous message |
If the 2 com port do not need to run at the same time, so that i connect the 2 com ports to the same MAX232, and use a pin in the MCU to switch between the 2 com ports, is it possible.
COM 1 need only transmittion while COM 2 need both transmittion and receiption. so i think i will connect COM 1 and COM 2's tx to the tx of the MAX232 and a pin from MCU to switch between them. |
| Topic | Author | Date |
| How to drive 2 serial COM ports? | 01/01/70 00:00 | |
| soft UART | 01/01/70 00:00 | |
| hard UARTs | 01/01/70 00:00 | |
| How to drive 2 serial COM ports? | 01/01/70 00:00 | |
| Two 8052 | 01/01/70 00:00 | |
| Two - make one a cheapie | 01/01/70 00:00 | |
| cheap | 01/01/70 00:00 | |
| very | 01/01/70 00:00 | |
| If the 2 com ports do not need to run at | 01/01/70 00:00 | |
| Only One 8051 UART! | 01/01/70 00:00 | |
| The 2 COMs are from 2 different PCs. | 01/01/70 00:00 | |
| How to drive 2 serial COM ports? | 01/01/70 00:00 | |
| Try to use 74HC125 | 01/01/70 00:00 | |
| Better at inputs! | 01/01/70 00:00 | |
| Thanks very much | 01/01/70 00:00 | |
| Why two MAX232 chips? | 01/01/70 00:00 | |
One is enough! | 01/01/70 00:00 |