DCS_V1.0/protocol/ModBus/tcpmaster_example.py

import modbus_tk
import modbus_tk.defines as cst
from modbus_tk import modbus_tcp, hooks
import logging
import struct
from .SetMessage import *
from .ByteOrder import *


class TcpMaster():
    def __init__(self, host = None, port = None):
        try:
            self.master = modbus_tcp.TcpMaster(host = host, port = port)
            self.master.set_timeout(5.0)
        except Exception as e:
            pass
        
        hooks.install_hook("modbus_tcp.TcpMaster.after_recv", afterRecv)
        hooks.install_hook("modbus_tcp.TcpMaster.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:
            return 'error'
    def writeSingleCoil(self, slaveId, address, outputValue):
        try:
            outputValue = int(outputValue)
            if outputValue in [0, 1]:
                self.master.execute(slaveId, cst.WRITE_SINGLE_COIL, address, output_value = outputValue)
        except Exception as e:
            return 'error'

    def readHoldingRegisters(self, slaveId, startAddress, varNums, order = 'ABCD'):
        print(order)
        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:
            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):
        print(slaveId, startAddress, varNums)
        try:
            value = self.master.execute(slaveId, cst.READ_DISCRETE_INPUTS, startAddress, varNums)
            return value[0]
        except:
            return 'error'





        # print(cst.READ_HOLDING_REGISTERS, cst.READ_COILS, cst.WRITE_SINGLE_REGISTER, cst.WRITE_SINGLE_COIL)
        # self.master.execute(1, cst.WRITE_MULTIPLE_REGISTERS, 0, output_value=[1, 2, 3, 4, 5])
        # self.master.execute(1, cst.WRITE_MULTIPLE_REGISTERS, starting_address=5, output_value=[3.0], data_format='>f')
        # self.master.execute(1, cst.WRITE_MULTIPLE_REGISTERS, starting_address=6, output_value=[4.0], data_format='>f')
        # self.master.execute(2, cst.WRITE_SINGLE_COIL, 2, output_value=1)
        # self.master.execute(2, cst.WRITE_MULTIPLE_COILS, 0, output_value=[1, 1, 0, 1, 1, 0, 1, 1])
        # logger.info(master.execute(1, cst.READ_HOLDING_REGISTERS, 0, 2, data_format='f'))

        # Read and write floats

        # send some queries
        # logger.info(master.execute(1, cst.READ_HOLDING_REGISTERS, 100, 12))


if __name__ == "__main__":
    TCPM = TcpMaster(host = '127.0.0.1', port = 502)
    TCPM.writeSingleRegister(1, 0, str(1))
    # TCPM.readHoldingRegisters(1, 0, 8)