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如果你需要使用JavaScript来操作一台RS458的设备#xff0c;那么你一定不能错过这个库 modbus-serial。
安装和使用
npm install modbus-serial支持的功能码
功能码函数FC1 读取读线圈寄存器readCoils(coil, len) FC2 读离散输入寄存器readDiscreteInputs(a…modbus-serial
如果你需要使用JavaScript来操作一台RS458的设备那么你一定不能错过这个库 modbus-serial。
安装和使用
npm install modbus-serial支持的功能码
功能码函数FC1 读取读线圈寄存器readCoils(coil, len) FC2 读离散输入寄存器readDiscreteInputs(addr, arg)FC3 读保持寄存器readHoldingRegisters(addr, len)FC4 读输入寄存器readInputRegisters(addr, len)FC5 写单个线圈寄存器writeCoil(coil, binary)FC6 写单个保持寄存器writeRegister(addr, value)FC15 写多个线圈寄存器writeCoils(addr, valueAry)FC16 写多个保持寄存器writeRegisters(addr, valueAry)FC43/14 读保持寄存器readDeviceIdentification(id, obj)
客户端串行 modbus-RTU (SerialPort)通过串行线路需要node serialport。 modbus-RTU (RTUBufferedPort)通过缓冲串行线路需要node serialport。 modbus-ASCII (AsciiPort)通过串行线路需要node serialport。
客户端TCP modbus-TCP (TcpPort)通过TCP/IP线路。 modbus-RTU (UdpPort)通过C701服务器商业UDP到串行桥。 modbus-RTU (TcpRTUBufferedPort)通过TCP/IP线路TCP/IP串行RTU缓冲设备。 modbus-RTU (TelnetPort)通过Telnet服务器TCP/IP串行桥。
服务器
modbus-TCP (ServerTCP)通过TCP/IP线路。
示例
读取和写入
// create an empty modbus client
const ModbusRTU require(modbus-serial);
const client new ModbusRTU();// open connection to a serial port
client.connectRTUBuffered(/dev/ttyUSB0, { baudRate: 9600 }, write);function write() {client.setID(1);// write the values 0, 0xffff to registers starting at address 5// on device number 1.client.writeRegisters(5, [0 , 0xffff]).then(read);
}function read() {// read the 2 registers starting at address 5// on device number 1.client.readHoldingRegisters(5, 2).then(console.log);
}读取多个从站
const ModbusRTU require(modbus-serial);
// create an empty modbus client
const client new ModbusRTU();
// open connection to a serial port
client.connectRTUBuffered(/dev/ttyS0, { baudRate: 9600 });
// set timeout, if slave did not reply back
client.setTimeout(500);// list of meters id
const metersIdList [10, 11, 12, 13, 14];const getMetersValue async (meters) {try{// get value of all metersfor(let meter of meters) {// output value to consoleconsole.log(await getMeterValue(meter));// wait 100ms before get another deviceawait sleep(100);}} catch(e){// if error, handle them here (it should not)console.log(e)} finally {// after get all data from slave, repeat it againsetImmediate(() {getMetersValue(metersIdList);})}
}const getMeterValue async (id) {try {// set ID of slaveawait client.setID(id);// read the 1 registers starting at address 0 (first register)let val await client.readInputRegisters(0, 1);// return the valuereturn val.data[0];} catch(e){// if error return -1return -1}
}const sleep (ms) new Promise(resolve setTimeout(resolve, ms));// start get value
getMetersValue(metersIdList);
ModbusTCP 服务
// create an empty modbus client
const ModbusRTU require(modbus-serial);
const vector {getInputRegister: function(addr, unitID) {// Synchronous handlingreturn addr;},getHoldingRegister: function(addr, unitID, callback) {// Asynchronous handling (with callback)setTimeout(function() {// callback function(err, value)callback(null, addr 8000);}, 10);},getCoil: function(addr, unitID) {// Asynchronous handling (with Promises, async/await supported)return new Promise(function(resolve) {setTimeout(function() {resolve((addr % 2) 0);}, 10);});},setRegister: function(addr, value, unitID) {// Asynchronous handling supported also hereconsole.log(set register, addr, value, unitID);return;},setCoil: function(addr, value, unitID) {// Asynchronous handling supported also hereconsole.log(set coil, addr, value, unitID);return;},readDeviceIdentification: function(addr) {return {0x00: MyVendorName,0x01: MyProductCode,0x02: MyMajorMinorRevision,0x05: MyModelName,0x97: MyExtendedObject1,0xAB: MyExtendedObject2};}
};// set the server to answer for modbus requests
console.log(ModbusTCP listening on modbus://0.0.0.0:8502);
const serverTCP new ModbusRTU.ServerTCP(vector, { host: 0.0.0.0, port: 8502, debug: true, unitID: 1 });serverTCP.on(socketError, function(err){// Handle socket error if needed, can be ignoredconsole.error(err);
});市面上有非常多的设备时 RS485如果你之前是前端并且想接触硬件就学习一下它吧。
