如何解决PyModbus 如何服务器识别寄存器更改
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?
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