| ??? 09/20/06 02:50 Read: times |
#124632 - The application is building automation Responding to: ???'s previous message |
If you give some more info about the physical layout of your system, I bet more help will follow. Is is direct line of sight? or in a building? As Andy mentions - we need to know more about the application. Thanks for your time. The application is products for building automation, such as water level controllers, fan speed controllers etc, such as used in heat recovery ventilators etc. I am now implementing this with RS485 and modbus. There will not be a clear line of sight, for example a water level sensor will be mounted inside the water tank on top of a 7 floor building with a sensor microcontroller mounted outside the tank with the wireless unit, the pump will be in the basement with the control microcontroller, I will be using RS485 and modbus protocol for this and in some cases I would like to elninate the wires. In another requirement the pump will be at a river and the water tank will be around 2 Kilometers away, there may not be a clear line of sight. There is no reason why you cannot send modbus ascii or RTU over a radio link - being natively half duplex, this makes things a little easier. This sounds good. you can use Modbus TCP/IP.. The beauty of going tcp/ip over ethernet is you have a choice of media - wireless,fibre optic, copper, internet. Will Modbus TCP/IP fit in small microcontrollers, 32K flash and 2K ram ? My final idea is to implement the BACnet protocol, since this seems to be the most popular standard for building automation. Regards, John. |
| Topic | Author | Date |
| Modbus protocol on wireless? | 01/01/70 00:00 | |
| lantronix->xport wireless | 01/01/70 00:00 | |
| Many ways | 01/01/70 00:00 | |
| The application is building automation | 01/01/70 00:00 | |
| I've done a bit of this.... | 01/01/70 00:00 | |
Thanks Russell | 01/01/70 00:00 |