PySerial设备报告准备读取

Question

我正在尝试让我的串行GSM调制解调器与AT命令和PySerial一起使用。不幸的是，我总是遇到以下错误。

read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

我的代码如下：

serialSource = serial.Serial('/dev/ttyACM3', baudrate=115200, timeout=0.5, write_timeout=None)

serialSource.write(b'AT+CMGR=1\r\n')

chunkSize = 200
encodedRead = b''
while True:
    byteChunk = serialSource.read(size=chunkSize)
    encodedRead += byteChunk
    if not len(byteChunk) == chunkSize:
        break

print(encodedRead)

奇怪的是，我只会定期收到此错误，但并非总是如此。

read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
b'AT+CMGR=1\r\n\r\nOK\r\n'
read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

如果我在写入和读取之间放置一个time.sleep(0.1)，那么我不会收到任何错误，但是它返回的是一个空字节数组b''。有什么想法吗？