Python3 通过串口提供Modbus服务 含浮点数处理

1、引入依赖库

import modbus_tk.defines as cst
from modbus_tk import modbus_rtu
import serial
import time
import struct

2、建立MODBUS服务

	PORT = 'COM5'
    server = modbus_rtu.RtuServer(serial.Serial(PORT))
    try:
        server.start()
        slave_1 = server.add_slave(1)
        slave_1.add_block('COILS', cst.COILS, 0, 100)
        slave_1.add_block('DISCRETE_INPUTS', cst.DISCRETE_INPUTS, 0, 100)
        slave_1.add_block('HOLDING_REGISTERS', cst.HOLDING_REGISTERS, 0, 100)
        slave_1.add_block('ANALOG_INPUTS', cst.ANALOG_INPUTS, 0, 100)
        print('MODBUS服务器已启动')
        while True:
            try:
                slave_1.set_values('HOLDING_REGISTERS', 0, floatToUshort(29.2966))
                slave_1.set_values('HOLDING_REGISTERS', 2, floatToUshort(6.9394))
                slave_1.set_values('HOLDING_REGISTERS', 4, floatToUshort(2.5283))
                slave_1.set_values('HOLDING_REGISTERS', 6, floatToUshort(72.4002))
                slave_1.set_values('HOLDING_REGISTERS', 8, floatToUshort(0.0367))
                slave_1.set_values('HOLDING_REGISTERS', 10, floatToUshort(0.0431))
            except BaseException as e:
                print('取数据异常：')
                print(e)
            finally:
                time.sleep(5)

3、浮点数的处理

def floatToUshort(f):    
    return struct.unpack(">2H",struct.pack(">f",f))# >:大端存储   <:小端存储

4、运行看效果