High-performance, non-blocking, zero-buffer-copying Modbus for Java.

Quick Start

ModbusTcpMasterConfig config = new ModbusTcpMasterConfig.Builder("localhost").build();
ModbusTcpMaster master = new ModbusTcpMaster(config);

master.connect();

CompletableFuture<ReadHoldingRegistersResponse> future =
    master.sendRequest(new ReadHoldingRegistersRequest(0, 10), 0);

future.thenAccept(response -> {
    System.out.println("Response: " + ByteBufUtil.hexDump(response.getRegisters()));

    ReferenceCountUtil.release(response);
});

See the examples project for more.

Maven

Modbus Master

<dependency>
    <groupId>com.digitalpetri.modbus</groupId>
    <artifactId>modbus-master-tcp</artifactId>
    <version>1.2.0</version>
</dependency>

Modbus Slave

<dependency>
    <groupId>com.digitalpetri.modbus</groupId>
    <artifactId>modbus-slave-tcp</artifactId>
    <version>1.2.0</version>
</dependency>

Supported Function Codes

Code	Function
0x01	Read Coils
0x02	Read Discrete Inputs
0x03	Read Holding Registers
0x04	Read Input Registers
0x05	Write Single Coil
0x06	Write Single Register
0x0F	Write Multiple Coils
0x10	Write Multiple Registers
0x16	Mask Write Register
0x17	Read/Write Multiple Registers

Get Help

See the examples project or create a new post in Discussions.

License

Apache License, Version 2.0