我正在嘗試從Modbus TCP設備讀取String(Usecase-1) & multiple type of data in one request(Usecase-2) 數據，但未能正確解碼。系統配置：Python 3.6.5Pymodbus：2.1.0平臺：Windows 10 64 位Modbus TCP 服務器：import loggingfrom pymodbus.constants import Endianfrom pymodbus.datastore import ModbusSequentialDataBlockfrom pymodbus.datastore import ModbusSlaveContext, ModbusServerContextfrom pymodbus.device import ModbusDeviceIdentificationfrom pymodbus.payload import BinaryPayloadBuilderfrom pymodbus.server.sync import StartTcpServerclass ModbusTCPServer(object): # initialize your data store: hrBuilder = BinaryPayloadBuilder(byteorder=Endian.Big, wordorder=Endian.Big) # Usecase-1 hrBuilder.add_string("abcdefghij") #Uncomment below three lines for usecase-2 # hrBuilder.add_32bit_float(20.5) # hrBuilder.add_32bit_int(45) # hrBuilder.add_bits([1, 0, 0, 0, 0, 0, 0, 0]) hrBlock = ModbusSequentialDataBlock(0, hrBuilder.to_registers() * 100) store = ModbusSlaveContext(hr=hrBlock, ir=hrBlock, di=hrBlock, co=hrBlock) 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();
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呼如林
TA貢獻1798條經驗 獲得超3個贊
使用zero_mode=True在ModbusSlaveContext。
如果要將[0..n]客戶端中的寄存器映射到[0..n]服務器中。默認情況下，pymodbus 服務器將寄存器讀取地址映射[0..n]到[1..n]其內部存儲中的寄存器。這是為了遵守 modbus 規范。引用 pymodbus 源代碼。
#The slave context can also be initialized in zero_mode which means that a
# request to address(0-7) will map to the address (0-7). The default is
# False which is based on section 4.4 of the specification, so address(0-7)
# will map to (1-8)::
因此，在您的情況下，您可以設置ModbusSequentialDataBlockto的起始地址1或ModbusSlaveContext使用zero_mode=True.
hrBlock = ModbusSequentialDataBlock(1, hrBuilder.to_registers() * 100)
# Or
store = ModbusSlaveContext(hr=hrBlock, ir=hrBlock, di=hrBlock, co=hrBlock, zero_mode=True)
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