After not using my photons I tried to make a simple scetch and read out data serial monitor. Unfortunately the device does not appear as serial device. I earlier had this problem after updating the OS but this time I seem to be stuck.
I tried to install new drivers for the serial port communication. Unfortunately I did not document which I exactly tried.
My hypothesis is that is has something to do with the MacOS version 10.12.4, Sierra.
Anyone experiencing similar problems, and solved them?