Any switch on the Cumulus Networks HCL can be accessed via the console. The standard command to use for console access depends on your host operating system.
screen /dev/cu.usbserial 115200
picocomm -b 115200 /dev/ttyUSB0
USB0 can be USB1 or USB2, etc.
Most switches on the Cumulus Networks HCL are set at either 9600 or 115200. This depends on the factory setting.