使用modbus-serial 库对modbus slave 写入寄存器值
modbus tcp client 代码
目标电脑(启动modbus slave 的电脑)ip为 192.168.3.46,端口502
代码语言:javascript复制 // 读取另一台电脑,192.168.3.46:502 Modbus TCP
// create an empty modbus client
const ModbusRTU = require("modbus-serial");
const client = new ModbusRTU();
// open connection to a tcp line
client.connectTCP("192.168.3.46", { port: 502 });
client.setID(1);
// read the values of 10 registers starting at address 0
// on device number 1. and log the values to the console.
// 读取0-10个寄存器的值
setInterval(function () {
client.readHoldingRegisters(0, 10, function (err, data) {
console.log(data);
});
}, 1000);
let i = 1;
setInterval(() => {
// 从地址5的寄存器开始,写入i,i*2 1
client.writeRegisters(5, [i, i * 2 1]).then(() => {
console.log("write success");
i ;
});
}, 1000);