78 lines
2 KiB
Markdown
78 lines
2 KiB
Markdown
go modbus [](https://travis-ci.org/goburrow/modbus) [](https://godoc.org/github.com/goburrow/modbus)
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=========
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Fault-tolerant, fail-fast implementation of Modbus protocol in Go.
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Supported functions
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-------------------
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Bit access:
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* Read Discrete Inputs
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* Read Coils
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* Write Single Coil
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* Write Multiple Coils
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16-bit access:
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* Read Input Registers
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* Read Holding Registers
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* Write Single Register
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* Write Multiple Registers
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* Read/Write Multiple Registers
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* Mask Write Register
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* Read FIFO Queue
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Supported formats
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-----------------
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* TCP
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* Serial (RTU, ASCII)
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Usage
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-----
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Basic usage:
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```go
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// Modbus TCP
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client := modbus.TCPClient("localhost:502")
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// Read input register 9
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results, err := client.ReadInputRegisters(8, 1)
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// Modbus RTU/ASCII
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// Default configuration is 19200, 8, 1, even
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client = modbus.RTUClient("/dev/ttyS0")
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results, err = client.ReadCoils(2, 1)
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```
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Advanced usage:
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```go
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// Modbus TCP
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handler := modbus.NewTCPClientHandler("localhost:502")
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handler.Timeout = 10 * time.Second
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handler.SlaveId = 0xFF
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handler.Logger = log.New(os.Stdout, "test: ", log.LstdFlags)
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// Connect manually so that multiple requests are handled in one connection session
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err := handler.Connect()
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defer handler.Close()
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client := modbus.NewClient(handler)
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results, err := client.ReadDiscreteInputs(15, 2)
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results, err = client.WriteMultipleRegisters(1, 2, []byte{0, 3, 0, 4})
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results, err = client.WriteMultipleCoils(5, 10, []byte{4, 3})
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```
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```go
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// Modbus RTU/ASCII
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handler := modbus.NewRTUClientHandler("/dev/ttyUSB0")
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handler.BaudRate = 115200
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handler.DataBits = 8
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handler.Parity = "N"
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handler.StopBits = 1
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handler.SlaveId = 1
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handler.Timeout = 5 * time.Second
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err := handler.Connect()
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defer handler.Close()
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client := modbus.NewClient(handler)
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results, err := client.ReadDiscreteInputs(15, 2)
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```
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References
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----------
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- [Modbus Specifications and Implementation Guides](http://www.modbus.org/specs.php)
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