Raspberry pi serial communication-python write command issue

Question

I use PC to control extral device, and this device is serial port communicate with PC, and it works good. I can send the commands to device from PC to device. The belwo is command structure.Python versio is 2.7.

Initialize=[0xEE,0x01,0x01] 
ser.write(Initialize)

Now, I use the raspberry pi to connect this device, and I'm sure rapsberry pi has connected with thid device. I use the below command to test connection.

ser=serial.Serial("/dev/ttyACM0", baudrate=115200, timeout=0.5)
print ("Port "+ ser.portstr + "opened:" + str(ser.isOpen()))

Now, the issue is I cannot write the data to device as I did in PC. The python version is 3.4.2. Write command:

Initialize=[0xEE,0x01,0x01] 
ser.write(Initialize)

Error message:

Traceback (most recent call last):
  File "/home/pi/ssbar/ss.py", line 65, in <module>
    ser.write(Initialize)
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 475, in write
    n = os.write(self.fd, d)
TypeError: 'list' does not support the buffer interface

Is anyone knows how to fix it? Many thank for your help!

The type you are looking for is wrong.docs.python.org/3/c-api/buffer.html — MiltoxBeyond
– MiltoxBeyond, Commented Jun 14, 2016 at 2:40
In Python 3 I think you will have to convert your list Initialize into a byte stream. — DisappointedByUnaccountableMod
– DisappointedByUnaccountableMod, Commented Jun 14, 2016 at 7:26

Darren · Accepted Answer · 2016-06-14 14:41:14Z

1

Thanks for your answer. It works now. The belwo is correct command.

x=bytearray(Initialize)
ser.write(x)

answered Jun 14, 2016 at 14:41

Darren

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