| ??? 11/27/07 20:09 Read: times Msg Score: -1 -1 Answer is Wrong |
#147472 - 8051 and RS485 Responding to: ???'s previous message |
I use both RS232 and RS485 on my board. Basically RS485 is balanced RS232. My micro is a 89C52 with an SPI port et al. I connect the desired number of UARTs (MAX3100CEE) to the SPI port connect the CS pins to their own I/O port of the micro. The MAX208 is used for the RS232 ports and a SP331 (Sipex) is used to translate from UART to RS485. I use this device because it can be configured to RS232 also. Don't forget the TVS diodes and balance resistors for protection on the lines that go off-board. The RS485 connectors are RJ45's. I have a schematic if you'd like an example.
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| Topic | Author | Date |
| 8051 and RS485 how to | 01/01/70 00:00 | |
| RS485 | 01/01/70 00:00 | |
| www.RS485.com | 01/01/70 00:00 | |
| Buy of the shelf converters | 01/01/70 00:00 | |
| RS485 & 8051 how to | 01/01/70 00:00 | |
| topology | 01/01/70 00:00 | |
| Thanks! | 01/01/70 00:00 | |
to-- Ta Cong | 01/01/70 00:00 | |
| naah, that is too cumbersome and expensive | 01/01/70 00:00 | |
| seek and ye shall find | 01/01/70 00:00 | |
| 8051 and RS485 | 01/01/70 00:00 | |
| NO, it is NOT | 01/01/70 00:00 | |
| Full Duplex - half duplex | 01/01/70 00:00 | |
| a different tune | 01/01/70 00:00 | |
| About using an RJ45 connector | 01/01/70 00:00 | |
| OP seems to have abandon this thread !!!!!!!!! | 01/01/70 00:00 |