pack(">" + fmt, j) data_format = ">HH" if expected_length < 0: expected_length = 8 构建数据包 无论是读取、写入线圈或者寄存器,每一个请求都会包含一个 pdu 数据单元。 在Master.execute() 方法下面,每一种读写操作都会运行 TcpMaster._make_query() 方法: query = self._make_query() ...
byte_count =2*len(output_value)# 使用 struct 对数据进行转换, 采用大端排列pdu = struct.pack(">BHHB", function_code, starting_address, byte_count //2, byte_count)# 输出值和 format,如果指定了 format 和输出值,将运行下面的逻辑ifoutput_valueanddata_format: pdu += struct.pack(data_format, ...
data_format='62f', # 数据解码格式 ) data += master.execute( # 向从站发送报文读取[124,247]区间的寄存器数据 1, cst.READ_HOLDING_REGISTERS, 124, 124, data_format='62f' ) # 将数据保存到csv文件中 if len(data) % 4 != 0: # 如果数据长度不是4的倍数,则用 0 补齐 for i in range(0...
print(f'往{slave}:{starting_address}写入数据:{data}成功') except modbus_tk.modbus_tcp.ModbusInvalidResponseError as err: print(traceback.format_exc()) print(f'往{slave}:{starting_address}写入数据:{data}失败') def read_data(self, starting_address: int, nums=10, slave=1) -> tuple: "...
(slave=1,function_code=cst.READ_HOLDING_REGISTERS,starting_address=0,quantity_of_x=1)# 将大端表示的整数转换为小端big_endian_value=struct.unpack('>H',struct.pack('<H',data[0]))[0]print("Big Endian Value: {}".format(data[0]))print("Little Endian Value: {}".format(big_endian_value...
When "data_format='f'",Invalid CRC in response #176 opened Nov 21, 2022 by waCoding 7 Project dependencies may have API risk issues #174 opened Oct 26, 2022 by PyDeps 1 simulator.py/RpcHandler() needs encode/decode to work these days #173 opened Sep 20, 2022 by kiml ...
Modbus 协议是一种典型的工业控制系统通信协议，是目前应用最为广泛的工业控制协议之一。由于其设计简单、...
How to get serial data frame at the same time, when query the value of holding register? For example: master.execute (1, cst.READ_HOLDING_REGISTERS, 1, 2) . I want to monitor all the data frames that sent and received on the serial port and save them to a file. Junkiwang changed...
SwiftUI的环境使我们可以使用来自外部的值，这对于读取Core Data上下文或视图的展示模式等很有用。但是我们...
data_format =">"+ (quantity_of_x *"H")ifexpected_length <0:# No lenght was specified and calculated length can be used:# slave + func + bytcodeLen + bytecode x 2 + crc1 + crc2expected_length =2* quantity_of_x +5else:raiseModbusFunctionNotSupportedError("The {0} function code ...