Intel SC450NX - Server Platform - 0 MB RAM, Product Manual

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How the EMP Console Works
The EMP shares the COM2 port with the system. When the EMP has control of the port, the port
operates in command state. When the system has control of it, the port operates in redirect state.
When connecting to a server, the EMP console checks to determine the current COM2 port state.
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Command state—the default COM2 state. In this state, the EMP console communicates with
the server's firmware, allowing the client to remotely reset or power the server up or down.
The client can also view the server's SEL, FRU information, or SDR table.
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Redirect state—the EMP console serves as a PC ANSI terminal window for BIOS console
redirection. Commands typed in this terminal window are transmitted through BIOS to the
server's console, and text displayed on the server console is displayed on the EMP console's
terminal window. With the EMP in this state, you can remotely view boot messages, access
BIOS setup, and run DOS text mode applications through the EMP console's terminal window.
Figure 12. EMP Console in Command State