GSM setup- opened port error message - Raspberry Pi Forums


i have connected a-gsm shield http://itbrainpower.net/a-gsm/downloada ... -v1.01.pdf rpi3.
have imported , attempted execute power on code http://itbrainpower.net/a-gsm/raspberry ... code-a-gsm. however, getting following error message:

sudo ./poweronoff.py
traceback (most recent call last):
file "./poweronoff.py", line 66, in <module>
agsm.open()
file "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 271, in open
raise serialexception("port open.")
serial.serialutil.serialexception: port open.

assume need open different port. if solution, how do it. if not solution, need satisfy error message?



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