Patent ID: 7434071

Claim:
A multi-state recognition device applied in a server blade system having a blade server and a system management unit, wherein the system management unit is for managing the blade server, the multi-state recognition device is for receiving a server power signal outputted by the blade server and a user selection signal outputted by the system management unit, the server power signal has a plurality of states, and the user selection signal has a plurality of states, while the blade server, the system management unit, and the multi-state recognition device all receiving a main power source signal. the multi-state recognition device comprising: a first logic circuit, which receives the server power signal and the user select signal; and a first multi-color light emitting diode (LED) coupled with the first logic circuit for displaying a plurality of light signal states, wherein the first logic circuit controls the first multi-color LED according to the server power signal and the user select signal, so that the first multi-color LED displays corresponding light signal states according to the state of the server power signal, the state of the user signal, and the state of the main power source signal, the multiple states of the server power signal comprise a first enabled state, a first non-enabled state, and a first square-wave state, when the blade server is power on, the server power signal is at the first enabled when the blade server is power off, the server power signal is at the first non-enabled state, and when the blade server is in standby mode, the server power signal is at the first square-wave state, and the server power signal has a first frequency, the multiple states of the user selection signal comprise a second non-enabled state and a second square-wave state; and when a user selects the blade server or the blade server fails, the user selection signal is at the second squarewave state, the user selection signal has a second frequency.