byte_count = struct.calcsize(data_format)# 否则先计算整个 byte 的长度else: 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...
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...
read_data = master.execute(1, cst.READ_HOLDING_REGISTERS, 4, 4) # 写寄存器 起始地址为8的保持寄存器,操作寄存器个数为 4 ,一个浮点数float 占两个寄存器; # 写浮点数时一定要加 data_format 参数,两个ff 表示要写入两个浮点数,以此类推 # 我这里模拟的是小端模式,具体可参考 struct 用法。和数据源...
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...
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...
print(data) 6.1 定义 字典中对键值得要求: • 键:必须可哈希。 目前为止学到的可哈希的类型:int/bool/str/tuple;不可哈希的类型:list/set/dict。(集合) • 值:任意类型。 data_dict = { "木木":18, A : 50 123:5, (3, 6, 9):["木木","小林"] ...