setserial
Read and modify serial port information. tldr-pages
On Linux
Linux
Print all information about a specific serial device
setserial -a /dev/cuaNIdentifyPrint the configuration summary of a specific serial device (useful for printing during bootup process)
setserial -b deviceIdentifySet a specific configuration parameter to a device
sudo setserial device parameterIdentifyPrint the configuration of a list of devices
setserial -g device1 device2 ...Identify