For the average user a serial console has no advantage over a console offered by a directly attached keyboard and screen. Serial consoles are much slower, taking up to a second to fill a 80 column by 24 line screen. Serial consoles generally only support non-proportional ASCII text, with limited support for languages other than English.
There are some scenarios where serial consoles are useful. System administration of remote computers is usually done using SSH, but there are times when access to the console is the only way to diagnose and correct software failures. Major upgrades to the installed distribution may also require console access.
Defines the specified device as a system console. Available console devices can be (see completion helper):
ttySN- Serial device name
ttyUSBX- USB Serial device name
hvc0- Xen console
The speed (baudrate) of the console device. Supported values are:
1200- 1200 bps
2400- 2400 bps
4800- 4800 bps
9600- 9600 bps
19200- 19,200 bps
38400- 38,400 bps (default for Xen console)
57600- 57,600 bps
115200- 115,200 bps (default for serial console)
If you use USB to serial converters for connecting to your VyOS appliance please note that most of them use software emulation without flow control. This means you should start with a common baud rate (most likely 9600 baud) as otherwise you probably can not connect to the device using high speed baud rates as your serial converter simply can not process this datarate.