NetDuino+ RS485 Industrial Communications
Posted 11 September 2012 - 08:05 AM
Posted 11 September 2012 - 10:04 PM
Posted 12 September 2012 - 02:45 AM
Very interesting, so would you just use this to watch Modbus network traffic or can you communicate directly with a PLC?
If you know the protocol (Profibus, DH+, Optomux, etc.) you can write the code and have communication...
Posted 02 March 2014 - 08:45 AM
Hi there, Have you ever needed Modbus RTU using Netduino+ over a RS-485 network? Or do you need a Netduino with RS-485? Do it inexpensively with MAX483 connected directly to COM1 on the Netduino. Do you need a TCP to Serial Converter? You can do it with Netduino+ and the MAX483. Max483 works like a transceiver. The attached code allows to switch to transmit a Modbus message and turns on the receiver to catch the reply.
i was trying out ur coding for my netduino plus 1 and rs485 communication, but while deploying the code its showindg
"Error 1 'System.IO.Ports.SerialPort' does not contain a definition for 'ReadByte' and no extension method 'ReadByte' accepting a first argument of type 'System.IO.Ports.SerialPort' could be found (are you missing a using directive or an assembly reference?) C:\Users\CSIO\Documents\Visual Studio 2010\Projects\ceNetduinoPlusModbusRTU42\ceNetduinoPlusModbusRTU42\Program.cs 277 40 ceNetduinoPlusModbusRTU42 "
this error, cn u pls help me to over come dis problem.
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