| ??? 03/27/06 09:12 Read: times |
#113178 - Non-Standard Responding to: ???'s previous message |
I said:
For a standard approach, RS485 would be the way to go.
http://www.8052.com/forum/read.phtml?id=113177 For a non-standard approach, you could use a simple current-loop approach. eg, the MDB-ICP standard used within vending machines is a simple current-loop opto-isolated multidrop bus. It uses the Multiprocessor Mode of the 8051's UART for addressing the different slaves. You can now obtain a free copy of the spec from: http://www.vending.org/store/page10.html You would probably only be interested in the details of how the physical link works - not all the vending machine specifics! |
| Topic | Author | Date |
| aduc848 RS232 communications hub | 01/01/70 00:00 | |
| multiple RS232 not easy | 01/01/70 00:00 | |
| Not RS232 | 01/01/70 00:00 | |
| Non-Standard | 01/01/70 00:00 | |
| How much may the solution cost ? | 01/01/70 00:00 | |
| Cost | 01/01/70 00:00 | |
| Even better ... | 01/01/70 00:00 | |
| Cost again | 01/01/70 00:00 | |
| Single chip solution, some work rqd. | 01/01/70 00:00 | |
| sure, if he will switch to the ARM | 01/01/70 00:00 | |
| Yeah, it's way overengineered. | 01/01/70 00:00 | |
| USB-to-4xRS232 Chip | 01/01/70 00:00 | |
| a suggestion | 01/01/70 00:00 | |
| its easy peezy | 01/01/70 00:00 | |
| why? | 01/01/70 00:00 | |
| MCU with multiple UARTs ? | 01/01/70 00:00 | |
| Ethernet? | 01/01/70 00:00 | |
| also Lantronix | 01/01/70 00:00 | |
| I2C/SPI-Connected Multiple UARTs | 01/01/70 00:00 | |
| Ive written this thingy | 01/01/70 00:00 | |
Blast from the past | 01/01/70 00:00 |