The serial console is a connection over the RS-232 or serial port connection that allows a person access to a computer or network device console. Typically, a console is accessed over an SSH connection. However, with software, hardware, or other access problems, it may only be possible to access the machine or device (e.g. router) over a serial connection. Older computers and headless computer (computers or devices without monitors) also use the serial console as the main way to access the console.