在Raspberry Pi上通过串行通信读取数字

Question

我一直在尝试编写一个程序，让我的 Raspberry Pi 通过串行通信接收数字。我正在使用 Arduino 将这些数字传达给 Raspberry Pi。 Arduino 串行打印一个前缀字符，后跟数字：Serial.println("T"); Serial.println(483); 在程序中，我能够识别前缀，但是当我尝试读取以下数字时，我只能获取第一个数字：

ser = serial.Serial('/dev/ttyACM0', 9600, timeout = 0)

while True:
    if ser.in_waiting > 0:
        # If there's more than 20 bytes in the buffer, clear it.
        if ser.in_waiting >= 20:
            ser.reset_input_buffer()
        temp = ser.readline().decode('utf-8')
        # Check to see what the prefix of the data is
        if (temp.strip().isalpha()):
            # If we got a 'T', it's a temperature update. Save temperature as number and print
            if (temp.strip() == 'T'):
                temp = ser.readline().decode('utf-8')
                if temp.strip().isdigit():
                    number = (temp.strip())
                    print(number)

在这种情况下，当我 print(number) 它输出数字 4 而不是 483。有谁知道出了什么问题吗？

带替换的软件：

    if ser.in_waiting > 0:
        # If there's more than 20 bytes in the buffer, clear it.
        if ser.in_waiting >= 20:
            ser.reset_input_buffer()
        temp = ser.readline().decode('utf-8')
        # Check to see what the prefix of the data is
        if (temp.strip().isalpha()):
            # If we got a 'T', it's a temperature update. Update the temperature
            if (temp.strip() == 'B'):
                b = ser.readline()
                print([int(c) for c in b])
                temp = b.decode('utf-8')
                if temp.strip().isdigit():
                    number = (temp.strip())
                    print ("temp = " + temp)

Serial.println("T"); 之后输出Serial.println(483); 运行了三次：

[52]
temp = 4
[]
[]
[]
[]
[52]
temp = 4
[52]
temp = 4