0B 网关目标设备响应失败 与网关一起使用,指示没有从目标设备中获得响应。通常意味着设备未在网络中。
当你在使用modbus_tk库进行Modbus通信时遇到modbusinvalidresponseerror: response length is invalid错误,这通常意味着Modbus从设备返回的响应数据长度与主设备期望的长度不匹配。以下是一些可能的解决步骤和考虑因素: 检查Modbus通信的响应长度是否符合协议要求: Modbus协议对每种功能码和请求的数据量有明确的响应长度要求...
pdu = response[:7], response[7:]# 解包self._response_mbap.unpack(mbap)# 校验数据,传入请求的 mbap 以及 pdu 的长度self._response_mbap.check_response(self._request_mbap,len(pdu))# 返回 pdureturnpduelse:raiseModbusInvalidResponseError("Response length is only {0} bytes. ".format(len(res...
classTcpMbap(object):def__init__(self):self.transaction_id=0self.protocol_id=0self.length=0self.unit_id=0 TcpQuery.build_request() 的实现: defbuild_request(self,pdu,slave):if(slave<0)or(slave>255):raiseInvalidArgumentError("{0} Invalid value for slave id".format(slave))self._request...
response = self._handle(request)# send back the responseretval = call_hooks("modbus_rtu.RtuServer.before_write", (self, response))ifretvalisnotNone: response = retvalifresponse:ifself._serial.in_waiting >0:# Most likely master timed out on this request and started a new one# for which...
in <module> logger.info(master.execute(1, cst.READ_HOLDING_REGISTERS, 100, 3)) File "build\bdist.win32\egg\modbus_tk\utils.py", line 28, in new modbus_tk.modbus.ModbusInvalidResponseError: Response length is invalid 0 using: modbus-tk-0.3.0 python26 windows xp new to python Thank yo...