如果字符串太长，将无法从功率计获得响应

Question

我正在使用此代码与功率计通信：

def Hello() :
    answer = SendMessage("\x10\x49\x01\x00\x4A\x16","100b01000c16")
    if answer == 1:
        answer = SendMessage("\x10\x40\x01\x00\x41\x16","100001000116")
    if answer == 1:
        answer = SendMessage("\x10\x49\x01\x00\x4A\x16","100b01000c16")
    if answer == 1:
        answer = SendMessage("\x68\x0D\x0D\x68\x73\x01\x00\xB7\x01\x06\x01\x00\x00\x01\x00\x00\x00\x34\x16","100001000116")   
    if answer ==  1:
        input3 = input ("progress")

def SendMessage(message, expected):
    out = ''
    while out == '':
        # send the character to the device
        print (message)
        ser.write(message.encode())
        #Let's wait one second before reading output (let's give device time to answer)
        time.sleep(0.02)
        while ser.inWaiting() > 0:
            out += ser.readline().hex()
            if out != '':
                print (">>>>" + out)
                if out == expected:
                    print("Correct response")
                    out = ''
                    answer = 1
                    return answer
                else:
                    print("Incorrect response")
                    answer = 0
                    return answer

OpenComm = Hello()

代码远非理想。现在这只是概念证明。

根据发送时来自同一功率计的​​日志，>

68 0D 0D 68 73 01 00 B7 01 06 01 00 00 01 00 00 00 34 16
应该回复

10 00 01 00 01 16
但是现在，当我发送该特定消息时，它什么也不做（尽管它确实响应了先前的消息）。十六进制可能太长吗？如果是这样，关于如何解决该问题的任何想法？

这是我配置串行端口的方式：

ser = serial.Serial(
    port = "COM3",
    baudrate=9600,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_TWO,
    bytesize=serial.EIGHTBITS,
    timeout=1
)

我正在使用此代码与电表进行通信：def Hello（）：答案= SendMessage（“ \ x10 \ x49 \ x01 \ x00 \ x4A \ x16”，“ 100b01000c16”，如果答案== 1：答案= SendMessage（“ \ x10 \ x40 \ ...

Answer 1

您的代码中有一个微小但重要的问题。