PyModbus 如何服务器识别寄存器更改

问题描述

我在使用 pyModbus 时遇到问题，我尝试使用官方网站上的示例，但没有解决我的问题。

我写了这个客户端。

from pymodbus.client.sync import ModbusTcpClient as ModbusClient
from pymodbus.payload import BinaryPayloadDecoder,BinaryPayloadBuilder
from pymodbus.constants import Endian
from pymodbus.compat import iteritems

if __name__ == '__main__':
    client = ModbusClient('127.0.0.1',port=501)
    client.connect()

    hrBuilder = BinaryPayloadBuilder(byteorder=Endian.Big,wordorder=Endian.Big)
    hrBuilder.add_string("abcdefghijklmnopqrstuvz    ")

    payload = hrBuilder.to_registers()
    payload = hrBuilder.build()
    registers = hrBuilder.to_registers()
    address = 0
    client.write_registers(address,registers,unit=1)


    result  = client.read_holding_registers(0,50,unit=1)
    print("Result : ",result)
    decoder = BinaryPayloadDecoder.fromregisters(result.registers,byteorder=Endian.Big,wordorder=Endian.Big)

    decoded = {
        'name': decoder.decode_string(28).decode(),}

    for name,value in iteritems(decoded):
        print ("%s\t" % name,value)
    client.close()

此代码有效；将字母表写入寄存器，然后阅读。 服务器是这样的：

from pymodbus.constants import Endian
from pymodbus.datastore import ModbusSequentialDataBlock
from pymodbus.datastore import ModbusSlaveContext,ModbusServerContext
from pymodbus.device import Modbusdeviceidentification
from pymodbus.payload import BinaryPayloadBuilder
from pymodbus.server.sync import StartTcpserver

class ModbusTcpserver(object):
    # initialize your data store:
    hrBuilder = BinaryPayloadBuilder(byteorder=Endian.Big,wordorder=Endian.Big)

    hrBuilder.add_string("aaaaaaaaaaaaaaaaaaaaaaaaaaa")

    hrBlock = ModbusSequentialDataBlock(0,hrBuilder.to_registers() * 100)
    store = ModbusSlaveContext(hr=hrBlock,ir=hrBlock,di=hrBlock,co=hrBlock,zero_mode=True)
    slaves = {
        1: store,}
    context = ModbusServerContext(slaves=slaves,single=False)

    # initialize the server information
    identity = Modbusdeviceidentification()

    modbusDeviceAddress = "127.0.0.1"
    modbusDevicePort = 501
    # run the TCP server

    # TCP:
    print("Modbus TCP Server started.")
    StartTcpserver(context,identity=identity,address=(modbusDeviceAddress,modbusDevicePort))


if __name__ == "__main__":
    print("Reading application configurations...")
    ModbusTcpserver();

我有两个问题。强制将空间分配到上下文中

hrBuilder.add_string("aaaaaaaaaaaaaaaaaaaaaaaaa") ??

如果我把服务器弄成这样，就不行了：

from pymodbus.constants import Endian
from pymodbus.datastore import ModbusSequentialDataBlock
from pymodbus.datastore import ModbusSlaveContext,ModbusServerContext
from pymodbus.device import Modbusdeviceidentification
from pymodbus.payload import BinaryPayloadBuilder
from pymodbus.server.sync import StartTcpserver

class ModbusTcpserver(object):

    # initialize the server information
    identity = Modbusdeviceidentification()

    modbusDeviceAddress = "127.0.0.1"
    modbusDevicePort = 501
    # run the TCP server

    # TCP:
    print("Modbus TCP Server started.")
    StartTcpserver( identity=identity,modbusDevicePort))


if __name__ == "__main__":
    print("Reading application configurations...")
    ModbusTcpserver();

有办法让它变得聪明吗？

另一个问题是我的主要问题，例如，每次寄存器更改时如何进行打印？

解决方法

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