Standard Break Key Combinations SoftwareĬonnect pin 2 (X-mit) to +V for half a second A break signal enables you to access a ROM Monitor on Cisco IOS® devices when a password recovery is necessary. So, no character combination can look like the break signal. The level condition of the start and stop bits is always opposite. All characters begin with a start bit and end with a stop bit (and also a parity bit or two). A break signal is when the data line remains in the space condition for a specified duration, usually 100 ms to ½ second. The Electronic Industries Association RS-232 logic level uses +3 to +25 volts to signify a Space (Logic 0) and -3 to -25 volts for a Mark (logic 1). Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, ensure that you understand the potential impact of any command.

All of the devices used in this document started with a cleared (default) configuration.

The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. This document describes the standard break key sequence combinations for the operating systems and how to fix any issues.

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