![]() func (s *Server) ListenRTU(serialConfig *serial.func (frame *RTUFrame) SetException(exception *Exception).func (frame *RTUFrame) SetData(data byte).func (frame *RTUFrame) GetFunction() uint8.func NewRTUFrame(packet byte) (*RTUFrame, error).func WriteSingleCoil(s *Server, frame Framer) (byte, *Exception).func WriteMultipleCoils(s *Server, frame Framer) (byte, *Exception).func WriteHoldingRegisters(s *Server, frame Framer) (byte, *Exception).func WriteHoldingRegister(s *Server, frame Framer) (byte, *Exception).func ReadInputRegisters(s *Server, frame Framer) (byte, *Exception).func ReadHoldingRegisters(s *Server, frame Framer) (byte, *Exception).func ReadDiscreteInputs(s *Server, frame Framer) (byte, *Exception).func ReadCoils(s *Server, frame Framer) (byte, *Exception).func GetException(frame Framer) (exception Exception).It is looking for the actual server where the DB is installed. However, this is not the value go-mssqldb is looking for. func Uint16ToBytes(values uint16) byte The confusing aspect seems to come from the fact that the go-mssqldb needs a parameter passed named 'server' and in SQL Management Studio they have a clear reference to server in the connection properties: Connection Properties.func SetDataWithRegisterAndNumberAndValues(frame Framer, register uint16, number uint16, values uint16).func SetDataWithRegisterAndNumberAndBytes(frame Framer, register uint16, number uint16, bytes byte).func SetDataWithRegisterAndNumber(frame Framer, register uint16, number uint16).Results, err := client.ReadHoldingRegisters(0, 3) _, err = client.WriteMultipleRegisters(0, 3, byte) Connect manually so that multiple requests are handled in one session Handler := modbus.NewTCPClientHandler("localhost:1502") Change the port number as required.Ĭhange the address to 0.0.0.0 to listen on all network interfaces.Īn example of a client writing and reading holding regsiters: package main Modbus typically uses port 502 (standard users require special permissions to listen on port 502). The server will continue to listen until killed (-c). Example Modbus TCP ServerĬreate a Modbus TCP Server (Slave): package main Modbus requests are processed in the order they are received and will not overlap/interfere with each other. On start, all values are initialzied to zero. The server internally allocates memory for 65536 coils, 65536 discrete inputs, 653356 holding registers and 65536 input registers. The Golang Modbus Server (Slave) responds to the following Modbus function requests: (s) RegisterFunctionHandler(funcCode, function) SetDataWithRegisterAndNumberAndValues(frame, register, number, values) SetDataWithRegisterAndNumberAndBytes(frame, register, number, bytes) SetDataWithRegisterAndNumber(frame, register, number) Example Listening on Multiple TCP Ports and Serial Devices
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