CODEWITHSUNDEEP
python
Zotto
Zotto

Reputation: 73

Having errors working with com ports using pyserial

I am trying to interface with my com ports, specifically an XBee connected to thi using this code.

from xbee import XBee
from serial import Serial

PORT = 'COM3'
BAUD = 9600

ser = Serial(PORT, BAUD)

xbee = XBee(ser)
# Send the string 'Hello World' to the module with MY set to 1
xbee.tx(dest_addr='\x00\x01', data='Hello World')

# Wait for and get the response
print(xbee.wait_read_frame())

ser.close()

However, this error keeps arising.

SerialException: could not open port 'COM3': WindowsError(5, 'Access is denied.'). It goes away when I restart my computer, buts it keeps returning. I'd prefer to understand why its happening so I don't need to keep restarting my computer. Would really appreciate any help, thanks. I am working through the IDLE interface with python 2.7 just in case that is relevant.

Upvotes: 1

Views: 287

Answers (1)

Paul Cornelius
Paul Cornelius

Reputation: 10906

A serial port can be "open" in only one application at a time. Once application "A" opens the port, application "B" will get an Access Denied error when it tries to open the same port. In your case, you need to figure out what other application is holding the port and close it first.

Upvotes: 1

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