| ??? 12/16/04 23:26 Read: times |
#83281 - Modbus Responding to: ???'s previous message |
I'd second the use of Modbus - I use this almost exclusively. Very simple to implement. Modbus ascii is easier from the PC side of things - I've had a lot of trouble with modbus rtu drivers on PCs so much that I use ethernet to modbus converter boxes.
See www.modbus.org I've found RS485 to be very reliable over large distances (~1000m) at 19200 baud. It's really just a matter of following the rules and success is virtually guaranteed. You can squeeze modbus (rtu or ascii) with some extra logic into a 89c2051 comfortably in assembler, allow about 5k if you use 'c' - recommended. External ram helps - especially if you have a lot of registers (modbus views the world as bits and 16 bit registers). |
| Topic | Author | Date |
| Control system | 01/01/70 00:00 | |
| buses for industrial | 01/01/70 00:00 | |
| CAN or RS-485 | 01/01/70 00:00 | |
| one way of master slave | 01/01/70 00:00 | |
| RS485 | 01/01/70 00:00 | |
| Control system | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| modbus or not | 01/01/70 00:00 | |
| rs-485 | 01/01/70 00:00 | |
| Rs485 vs CAN | 01/01/70 00:00 | |
| CAN | 01/01/70 00:00 | |
| rs-485,high speed? | 01/01/70 00:00 | |
| UART speed | 01/01/70 00:00 | |
| Speed | 01/01/70 00:00 | |
| Go Speed Racer! | 01/01/70 00:00 | |
| comments on speed and the above | 01/01/70 00:00 | |
| Daisy chain | 01/01/70 00:00 | |
| Daisy,Daisy..... | 01/01/70 00:00 | |
| no repeat | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| Hub ? | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
| More modbus | 01/01/70 00:00 | |
| Modbus | 01/01/70 00:00 | |
failed links | 01/01/70 00:00 |