Refer to for more information and for an upgrade of the hyperterminal software. Some versions of Windows NT have hyperterminal software that cannot send the correct break key signal. You need to have connection to the console port, and have these settings: Therefore, it is no use if you send a break through the AUX port. The auxiliary (AUX) port is not active during the boot sequence of a router. For software not listed in the table, and for additional information, refer to the documentation of the individual software packages. Problems that you encounter during password recovery often occur because you are not sure about what the break key sequence is for the (non-Cisco) software you use. Standard Break Key Combinations SoftwareĬonnect pin 2 (X-mit) to +V for half a second Refer to Cisco Technical Tips Conventions for more information on document conventions.

If your network is live, make sure 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. 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). This document provides standard break key sequence combinations for the most common operating systems, and some tips on how to troubleshoot problems.

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