DCS_V1.0/protocol/ModBus/rtumaster_example.py

import serial

import modbus_tk
import modbus_tk.defines as cst
from modbus_tk import modbus_rtu, hooks
import sys

from .ByteOrder import *
from .SetMessage import *

# master = modbus_rtu.RtuMaster(serial.Serial(port = 'COM4', baudrate = 9600, bytesize = 8, parity = 'N', stopbits = 1, xonxoff=0))

# exec(slave=1, function_code=READ_HOLDING_REGISTERS, starting_address=0, quantity_of_x=0, output_value=0, data_format=“”, expected_length=-1)
# 参数说明：
# @slave=1 : identifier of the slave. from 1 to 247. 
# @function_code=READ_HOLDING_REGISTERS：功能码
# @starting_address=100：寄存器的开始地址
# @quantity_of_x=3：寄存器/线圈的数量
# @output_value：一个整数或可迭代的值：1/[1,1,1,0,0,1]/xrange(12)
# @data_format：对接收的数据进行格式化



class RTUMaster():
    def __init__(self, port = 'COM4', baudrate = 9600, bytesize = 8, parity = 'N', stopbits = 1, xonxoff = 0):
        try:
            self.master = modbus_rtu.RtuMaster(serial.Serial(port = port, baudrate = baudrate, bytesize = bytesize, parity = parity, stopbits = stopbits, xonxoff = xonxoff))
            self.master.set_timeout(5.0)
            self.master.set_verbose(True)
        except Exception as e:
            pass

        hooks.install_hook("modbus_rtu.RtuMaster.after_recv", afterRecv)
        hooks.install_hook("modbus_rtu.RtuMaster.before_send", afterSend)

    def writeSingleRegister(self, slaveId, address, outputValue, order = 'ABCD'):
        try:
            if '.' not in str(outputValue):
                outputValue = int(outputValue)
                # print(outputValue)
                self.master.execute(slaveId, cst.WRITE_SINGLE_REGISTER, starting_address = address, output_value = outputValue)
            else:
                outputValue = float(outputValue)
                if order == 'ABCD': # 大端模式
                    valueByte = floatToABCD(outputValue)
                elif order == 'DCBA': # 小端模式
                    valueByte = floatToDCBA(outputValue)
                elif order == 'BADC':
                    valueByte = floatToBADC(outputValue)
                elif order == 'CDAB':
                    valueByte = floatToCDAB(outputValue)
                self.master.execute(slaveId, cst.WRITE_MULTIPLE_REGISTERS, starting_address = address, output_value=valueByte)
        except Exception as e:
            print('error')

    def writeSingleCoil(self, slaveId, address, outputValue):
       
        if outputValue in [0, 1]:
            self.master.execute(slaveId, cst.WRITE_SINGLE_COIL, address, output_value = outputValue)


    def readHoldingRegisters(self, slaveId, startAddress, varNums, order = 'ABCD'):
        try:
            if order == 'int':
                valueByte = self.master.execute(slaveId, cst.READ_HOLDING_REGISTERS, startAddress, varNums)[0]
            else:
                value = self.master.execute(slaveId, cst.READ_HOLDING_REGISTERS, startAddress, 2)
                if order == 'ABCD': # 大端模式
                    valueByte = ABCDToFloat(value)
                elif order == 'DCBA': # 小端模式
                    valueByte = DCBAToFloat(value)
                elif order == 'BADC':
                    valueByte = BADCToFloat(value)
                elif order == 'CDAB':
                    valueByte = CDABToFloat(value)
            return valueByte
        except Exception as e:
            return 'error'

    def readInputRegisters(self, slaveId, startAddress, varNums, order = 'ABCD'):
        try:
            if order == 'int':
                valueByte = self.master.execute(slaveId, cst.READ_INPUT_REGISTERS, startAddress, varNums)[0]
            else:
                value = self.master.execute(slaveId, cst.READ_INPUT_REGISTERS, startAddress, 2)
                if order == 'ABCD': # 大端模式
                    valueByte = ABCDToFloat(value)
                elif order == 'DCBA': # 小端模式
                    valueByte = DCBAToFloat(value)
                elif order == 'BADC':
                    valueByte = BADCToFloat(value)
                elif order == 'CDAB':
                    valueByte = CDABToFloat(value)
            return valueByte
        except Exception as e:
            return 'error'

    def readCoils(self, slaveId, startAddress, varNums, order = 'ABCD'):
        try:
            value = self.master.execute(slaveId, cst.READ_COILS, startAddress, varNums)
            return value[0]
        except Exception as e:
            return 'error'
    
    def readInputCoils(self, slaveId, startAddress, varNums):
        try:
            value = self.master.execute(slaveId, cst.READ_DISCRETE_INPUTS, startAddress, varNums)
            return value[0]
        except Exception as e:
            return 'error'

# -*- coding: utf_8 -*-


# import serial
# import modbus_tk
# import modbus_tk.defines as cst
# from modbus_tk import modbus_rtu


# def mod(PORT="com2"):
#     red = []
#     alarm = ""
#     try:
#         # 设定串口为从站
#         master = modbus_rtu.RtuMaster(serial.Serial(port=PORT,
#                                                     baudrate=9600, bytesize=8, parity='N', stopbits=1))
#         master.set_timeout(5.0)
#         master.set_verbose(True)

#         # 读保持寄存器
#         red = master.execute(1, cst.READ_HOLDING_REGISTERS, 0, 9)  # 这里可以修改需要读取的功能码
#         print(red)
#         alarm = "正常"
#         return list(red), alarm

#     except Exception as exc:
#         print(str(exc))
#         alarm = (str(exc))

#     return red, alarm  ##如果异常就返回[],故障信息


# if __name__ == "__main__":
#     mod()