modbus

by goburrow

goburrow /modbus

Fault-tolerant implementation of modbus protocol in Go (golang)

516 Stars 191 Forks Last release: about 2 years ago (v0.1.0) Other 79 Commits 1 Releases

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go modbus Build Status GoDoc

Fault-tolerant, fail-fast implementation of Modbus protocol in Go.

Supported functions

Bit access: * Read Discrete Inputs * Read Coils * Write Single Coil * Write Multiple Coils

16-bit access: * Read Input Registers * Read Holding Registers * Write Single Register * Write Multiple Registers * Read/Write Multiple Registers * Mask Write Register * Read FIFO Queue

Supported formats

  • TCP
  • Serial (RTU, ASCII)

Usage

Basic usage: ```go // Modbus TCP client := modbus.TCPClient("localhost:502") // Read input register 9 results, err := client.ReadInputRegisters(8, 1)

// Modbus RTU/ASCII // Default configuration is 19200, 8, 1, even client = modbus.RTUClient("/dev/ttyS0") results, err = client.ReadCoils(2, 1) ```

Advanced usage: ```go // Modbus TCP handler := modbus.NewTCPClientHandler("localhost:502") handler.Timeout = 10 * time.Second handler.SlaveId = 0xFF handler.Logger = log.New(os.Stdout, "test: ", log.LstdFlags) // Connect manually so that multiple requests are handled in one connection session err := handler.Connect() defer handler.Close()

client := modbus.NewClient(handler) results, err := client.ReadDiscreteInputs(15, 2) results, err = client.WriteMultipleRegisters(1, 2, []byte{0, 3, 0, 4}) results, err = client.WriteMultipleCoils(5, 10, []byte{4, 3}) ```

// Modbus RTU/ASCII
handler := modbus.NewRTUClientHandler("/dev/ttyUSB0")
handler.BaudRate = 115200
handler.DataBits = 8
handler.Parity = "N"
handler.StopBits = 1
handler.SlaveId = 1
handler.Timeout = 5 * time.Second

err := handler.Connect() defer handler.Close()

client := modbus.NewClient(handler) results, err := client.ReadDiscreteInputs(15, 2)

References

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