类型错误：write_register() 需要 3 个位置参数，但给出了 4 个

如何解决类型错误：write_register() 需要 3 个位置参数，但给出了 4 个

追溯：

mbAddress:  402
splitVal[0]:  62915
deviceId:  1
Traceback (most recent call last):
  File "E:\Jobs\Velocio\Development\XboxSpeedController\clsModbusClientTester.py",line 5,in <module>
    mbClient.sendFloat(402,3.14)
  File "E:\Jobs\Velocio\Development\XboxSpeedController\clsModbusClient.py",line 50,in sendFloat
    self.mbClient.write_register(mbAddress,splitVal[0],self.deviceId)
TypeError: write_register() takes 3 positional arguments but 4 were given

这是文件。

clsModbusClientTester.py:

from clsModbusClient import ModbusClient

mbClient = ModbusClient(1,'COM6',115200)

mbClient.sendFloat(402,3.14)

clsModbusClient.py:

from pymodbus.client.sync import ModbusSerialClient
import ModbusConversions as mbConv

class ModbusClient:
    def __init__(self,deviceId,port,baud):
        self.baud = baud
        self.port = port
        self.mbClient = ModbusSerialClient(
            method='rtu',port=port,baudrate=baud,timeout=3,parity='N',stopbits=1,bytesize=8
        )
        if self.mbClient.connect():
            self.mbConnected = True
            self.deviceId = deviceId
        else:
            self.mbConnected = False
    
    def sendFloat(self,mbAddress,value):
        if self.mbConnected:
            splitVal = mbConv.FloatTo2Words(value)
            print("mbAddress: ",mbAddress)
            print("splitVal[0]: ",splitVal[0])
            print("deviceId: ",self.deviceId)
            self.mbClient.write_register(mbAddress,self.deviceId)
            print("mbAddress+1: ",mbAddress+1)
            self.mbClient.write_register(mbAddress+1,splitVal[1],self.deviceId)

ModbusConversions.py：

def FloatTo2Words(FloatNumber):
    WordsResponse = struct.unpack('<HH',struct.pack('<f',FloatNumber))
        #the HH makes sure you get all 4 bytes which is both (2) words,the 2 converted integers
        #if you have a number that does not use enough bytes (like 0) it will fail w/o HH   
    return WordsResponse

我很困惑。如果我没有将 selfs 放入实例函数中，我会期望这是错误消息，例如 func(self,arguments)。也许我需要更多的自我:-)

有人有什么建议吗？感谢您的帮助。

解决方法

我通过深入研究 pymodbus 发现了我的问题。方法 write_register() 具有以下签名：

write_register(address,value,**kwargs)

所以修复是替换

        self.mbClient.write_register(mbAddress,splitVal[0],self.deviceId)

与

        self.mbClient.write_register(mbAddress,unit = self.deviceId)

,

当我将 ModelC 放入新的第二行时，它起作用了

admin.site.register(ModelA,ModelB)
admin.site.register(ModelC)