如何解决连接到PLC时，如何在Raspberry Pi 3上修复ipython ConnectionException：Modbus错误？
我在网上阅读到Modbus异常问题相对容易解决，但是由于我的经验不足，很难解决。我有一个VersaMax Nano Controller IC200NDR010-FJ，我正在尝试通过串行通信与树莓派3进行通信。
我已通过sudo raspi-config
我正在使用ipython，希望可以指出正确的方向。
Python 2.7.16 (default,Apr 6 2019,01:42:57)
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IPython 5.9.0 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object',use 'object??' for extra details.
In [1]: from pymodbus.client.sync import ModbusSerialClient
In [2]: VersaMax = ModbusSerialClient(method='rtu',port=' /dev/ttyS0',baudrate=9600,timeout=2000,parity='O')
In [3]: VersaMax.read_coils(2048,1,unit=1).bits
---------------------------------------------------------------------------
ConnectionException Traceback (most recent call last)
<ipython-input-3-1bbc9781f264> in <module>()
----> 1 VersaMax.read_coils(2048,unit=1).bits
/home/pi/.local/lib/python2.7/site-packages/pymodbus/client/common.pyc in read_coils(self,address,count,**kwargs)
46 '''
47 request = ReadCoilsRequest(address,**kwargs)
---> 48 return self.execute(request)
49
50 def read_discrete_inputs(self,count=1,**kwargs):
/home/pi/.local/lib/python2.7/site-packages/pymodbus/client/sync.pyc in execute(self,request)
105 """
106 if not self.connect():
--> 107 raise ConnectionException("Failed to connect[%s]" % (self.__str__()))
108 return self.transaction.execute(request)
109
ConnectionException: Modbus Error: [Connection] Failed to connect[ModbusSerialClient(rtu baud[9600])]
In [4]:
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