利用python语言实现一个modbus tcp服务端代码
时间: 2023-07-28 21:06:23 浏览: 53
下面是一个使用Python实现Modbus TCP服务器的示例代码:
```python
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import socket
import struct
class ModbusTCPServer:
def __init__(self, address="127.0.0.1", port=502):
self.address = address
self.port = port
self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.server_socket.bind((self.address, self.port))
def run(self):
self.server_socket.listen(1)
print("Modbus TCP server is listening on {}:{}".format(self.address, self.port))
while True:
client_socket, client_address = self.server_socket.accept()
print("Connection from {}:{}".format(*client_address))
request = client_socket.recv(1024)
if request:
response = self.handle_request(request)
client_socket.sendall(response)
client_socket.close()
def handle_request(self, request):
transaction_id, protocol_id, length = struct.unpack('>HHH', request[:6])
unit_id, function_code = struct.unpack('>BB', request[6:8])
if function_code == 3:
starting_address, quantity = struct.unpack('>HH', request[8:12])
data = self.read_holding_registers(starting_address, quantity)
response = self.build_response(transaction_id, unit_id, data)
else:
response = self.build_error_response(transaction_id, unit_id, 1)
return response
def read_holding_registers(self, starting_address, quantity):
# TODO: Implement this method to read data from your device
data = [0] * quantity
return data
def build_response(self, transaction_id, unit_id, data):
length = 3 + len(data) * 2
response = struct.pack('>HHHBB', transaction_id, 0, length, unit_id, 3)
response += struct.pack('B', len(data) * 2)
for value in data:
response += struct.pack('>H', value)
return response
def build_error_response(self, transaction_id, unit_id, error_code):
response = struct.pack('>HHHBBB', transaction_id, 0, 3, unit_id, 0x80 | error_code, 0)
return response
if __name__ == "__main__":
server = ModbusTCPServer()
server.run()
```
这个示例代码实现了一个简单的Modbus TCP服务器,读取保持寄存器。你可以根据你的需要修改`read_holding_registers`方法来实现你的设备读取逻辑。
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