I have a C program that opens a serial port. The code is not the issue here. When I run the program as sudo it works fine and opens the port. When I run it as myself (normal user) it fails to open the serial port.
The serial port is:
crw-rw-rw- 1 root wheel 18, 5 Dec 26 17:34 /dev/cu.usbmodem1421
I am running Mac OSX 10.11.6 (El Capitan). I have added myself to the 'wheel' group, and that did not help. So I am wondering why I cannot open it if I am a member of the 'wheel' group? Is there something else that I am missing.