DCS_V1.0/protocol/ModBus/tcpslave_example.py

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

# PORT = 'COM3'
#PORT = '/dev/ptyp5'
class TCPSlave():
    def __init__(self, address = '127.0.0.1', port = 502):
        try:
            self.server = modbus_tcp.TcpServer(address=address, port=port)
            self.server.start()
            print(f"TCP Slave started on {address}:{port}")
        except Exception as e:
            print(f"Failed to start TCP Slave on {address}:{port}: {e}")
            raise e

        # hooks.install_hook('modbus.Server.before_handle_request', afterRecv)
        # hooks.install_hook("modbus.Server.after_handle_request", afterSend)

    # 创建从站
    # 添加存储区
    # supported block types
    # COILS = 1
    # DISCRETE_INPUTS = 2
    # HOLDING_REGISTERS = 3
    # ANALOG_INPUTS = 4
    def addSlave(self, slaveId):
        try:
            self.server.add_slave(slaveId)
            slave = self.server.get_slave(slaveId)
            
            # 添加存储区 - 使用正确的地址范围
            slave.add_block('0', cst.COILS, 0, 9999)        # 线圈 0-9999
            slave.add_block('1', cst.DISCRETE_INPUTS, 10000, 19999)  # 离散输入 10000-19999
            slave.add_block('3', cst.ANALOG_INPUTS, 30000, 39999)    # 输入寄存器 30000-39999
            slave.add_block('4', cst.HOLDING_REGISTERS, 40000, 49999) # 保持寄存器 40000-49999
            
            print(f"Added slave {slaveId} with storage blocks")
            return True
            
        except Exception as e:
            print(f"Failed to add slave {slaveId}: {e}")
            return False



    def setValue(self, slaveId, name, address, value, order='ABCD'):
        try:
            slave = self.server.get_slave(slaveId)
            # print(value)
            if '.' in str(value):
                # 浮点数处理
                floatValue = float(value)
                if order == 'ABCD':  # 大端模式
                    valueByte = floatToABCD(floatValue)
                elif order == 'DCBA':  # 小端模式
                    valueByte = floatToDCBA(floatValue)
                elif order == 'BADC':
                    valueByte = floatToBADC(floatValue)
                elif order == 'CDAB':
                    valueByte = floatToCDAB(floatValue)
                else:
                    valueByte = floatToABCD(floatValue)
                slave.set_values(name, address, valueByte)
            else:
                # 整数处理
                intValue = int(value)
                slave.set_values(name, address, intValue)
            return True
            
        except Exception as e:
            print(f"TCP Slave setValue error: {e}")
            print(f"Error details - slaveId: {slaveId}, name: {name}, address: {address}, value: {value}")
            return False

    def readValue(self, slaveId, name, address, order = 'int'):
        try:
            slave = self.server.get_slave(slaveId)
            if order == 'int':
                value = slave.get_values(name, address, 1)[0]
            else:
                value = slave.get_values(name, address, 2)
                if order == 'ABCD': # 大端模式
                    value = ABCDToFloat(value)
                elif order == 'DCBA': # 小端模式
                    value = DCBAToFloat(value)
                elif order == 'BADC':
                    value = BADCToFloat(value)
                elif order == 'CDAB':
                    value = CDABToFloat(value)
            return value
        except Exception as e:
            return 'error'



if __name__ == "__main__":
    a = TCPSlave()
    a.addSlave(1)
    a.setValue(1, '0', 0, 1)
    a.readValue(1, '0', 0)

    a.setValue(1, '1', 10000, 1)
    a.readValue(1, '1', 10000)

    a.setValue(1, '3', 30000, 2)
    a.readValue(1, '3', 30000)

    a.setValue(1, '3', 30002, 2.5121231)
    a.readValue(1, '3', 30002, order ='ABCD')

    a.setValue(1, '4', 40000, 3)
    a.readValue(1, '4', 40000)

    a.setValue(1, '4', 40002, 3.51231234564)
    a.readValue(1, '4', 40002, order ='ABCD')