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上传时间: 2016-12-07
详细说明： The modbus protocol comes in two flavors: RTU and ASCII. RTU is a binary implementation and is often most desirable. As such, this discussion will pertain solely to the RTU standard. public bool SendFc3(byte address, ushort start, ushort registers, ref shor t[] values) { //Ensure port is open: if (sp.IsOpen) { //Clear in/out buffers: sp.DiscardOutBuffer(); sp.DiscardInBuffer(); //Function 3 request is always 8 bytes: byte[] message = new byte[8]; //Function 3 response buffer: byte[] response = new byte[5 + 2 * registers]; //Build outgoing modbus message: BuildMessage(address, (byte)3, start, registers, ref message); //Send modbus message to Serial Port: try { sp.Write(message, 0, message.Length); GetResponse(ref response); } catch (Exception err) { modbusStatus = "Error in read event: " + err.Message; return false; } //Evaluate message: if (CheckResponse(response)) { //Return requested register values: for (int i = 0; i < (response.Length - 5) / 2; i++) { values[i] = response[2 * i + 3]; values[i] <<= 8; values[i] += response[2 * i + 4]; } modbusStatus = "Read successful"; return true; } else { modbusStatus = "CRC error"; return false; } } else { modbusStatus = "Serial port not open"; return false; } } ...展开收缩
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