Connector switch

1. An interconnection between a noninvasive optical sensor and a monitor configured to receive one or more signals from said sensor indicative of light attenuated by body tissue, the monitor also configured to determine measurements for one or more physiological parameters based on the received one or more signals, the interconnection comprising:

a cable having a plurality of conductors providing electrical communication between a sensor connector and a monitor connector;

an information element readable by said monitor to determine information about a type of said sensor and to configure said monitor in its determination of said one or more physiological parameters based on said type, and mounted in one of said sensor connector, said monitor connector and said cable; and

a switch mounted in said sensor connector responsive to said sensor connecting to and disconnecting from said sensor connector so as to alter the readability of said information element.

2. The interconnection according to claim 1 wherein said switch has a closed position enabling said information element to be readable by said monitor and an open position disabling said information element from being readable by said monitor.

3. The interconnection according to claim 2 wherein said switch is normally in said open position and moves from said open position to said closed position as said sensor is connected to said sensor connector.

4. The interconnection according to claim 3 wherein said information element is a resistor and said switch electrically connects said resistor between a pair of said conductors so as to enable said monitor to determine a value for said resistor.

5. An interconnection method comprising the steps of:

providing a cable configured to communicate drive signals from a physiological parameter monitor to a noninvasive optical sensor capable of outputting a signal indicative of light attenuated by body tissue, and to communicate physiological signals from said sensor to said monitor;

associating an information element with said cable, said information element capable of conveying information regarding said sensor to said monitor; and

actuating a switch in response to said sensor connecting and disconnecting to said cable so as to render said information element readable and unreadable by said monitor, respectively.

6. The interconnection method according to claim 5 wherein said associating step comprises a substep of mounting said information element in a connector attached to said cable.

7. The interconnection method according to claim 6 wherein said actuating step comprising a substep of mechanically moving said switch with a portion of said sensor.

8. The interconnection method according to claim 7 wherein said actuating step comprising a substep of electrically connecting said information element to a conductor of said cable.

9. A sensor-monitor interconnection comprising:

a cable capable of communicate signals between a physiological sensor and a physiological parameter monitor;

an information element capable of conveying information regarding said sensor to said monitor; and

a switch associated with said cable and responsive to said physiological sensor connecting to and disconnecting from said cable so as to enable and disable access to said information element by said monitor.

10. The sensor-monitor interconnection according to claim 9 further comprising:

a sensor connector attached to said cable capable of electrically and mechanically connecting said sensor to said cable; and

a monitor connector attached to said cable capable of electrically and mechanically connecting said cable to said monitor,

wherein said information element is mounted within at least one of said sensor connector and said monitor connector.

11. The sensor-monitor interconnection according to claim 10 further comprising a plurality of conductors disposed within said cable, wherein said switch is adapted to connect and disconnect said information element to at least one of said conductors.

12. The sensor-monitor interconnection according to claim 11 further comprising a sensor portion configured to actuate said switch as said sensor is connected to said sensor connector.