Instrument end effector identification

1. A system for communicating to a robotic system information about a type of instrument mounted to a robotic manipulator arm, the system comprising:

a robotic manipulator arm;

a plurality of sensors on the robotic manipulator arm;

a receiving component removably positioned on the robotic manipulator arm, the receiving component including an elongate body and a plurality of members positioned on the body, each of said members moveable relative to at least one of said plurality of sensors;

a first instrument having

a first distal shaft,

a first end effector on a distal end of the first distal shaft, and

a first collar positioned on a proximal end of the first distal shaft, the first collar including a cavity and one or more first pins within the cavity, wherein the first collar is removably mountable to the receiving component with a portion of the elongate body disposed within the cavity;

a second instrument having

a second distal shaft,

a second end effector on a distal end of the second distal shaft, and

a second collar positioned on a proximal end of the second distal shaft, the second collar including a cavity and one or more second pins within the cavity, wherein the second collar is removably mountable to the receiving component with a portion of the elongate body disposed within the cavity;

wherein each first pin is positioned to cause movement of at least one of said plurality of members in response to mounting of the first collar to the receiving component to cause a first response at at least one of said plurality of sensors;

wherein each second pin is positioned to cause movement of at least one of said plurality of members in response to mounting of the second collar to the receiving component to cause a second response at at least one of said plurality of sensors, wherein the first response is different from the second response; and

wherein the robotic system is configured to determine an instrument end effector type based on the response of the at least one sensor from attachment of an instrument.

2. The system of claim 1 , wherein:

wherein the first pins are arranged such that mounting the first collar to the receiving member causes movement of a first set of one or more of the members,

wherein the second pins are arranged such that mounting the second collar to the receiving member causes movement of a second set of one or more of the members, and

wherein the first set and the second set include a different number of members.

3. The system of claim 2 , wherein:

the plurality of sensors are a plurality of reed switches;

each member is moveable relative to a corresponding one of the reed switches, each member including a magnet;

the members are positioned such that movement of the first set of one or more members in response to mounting the first collar on the receiving component causes a change of state on a first set of one or more of the reed switches;

the members are positioned such that movement of the second set of one or more members in response to mounting the second collar on the receiving component causes a change of state on a second set of one or more of the reed switches, the first set of reed switches and the second set of reed switches comprising different numbers of reed switches.

4. The system of claim 1 wherein each member is longitudinally slidable between a first position and a second position, each member closer to a corresponding one of the plurality of sensors when in the first position than when in the second position.

5. The system of claim 4 , wherein the members are biased in the second position.

6. The system of claim 1 , wherein:

the plurality of sensors are a plurality of switches;

each member is moveable relative to a corresponding one of the switches;

the members are positioned such that movement of a first set of one or more members in response to mounting the first collar on the receiving component causes closing of a first set of one or more of the switches using physical contact;

the members are positioned such that movement of a second set of one or more members in response to mounting the second collar on the receiving component causes closing of a second set of the one or more of the switches using physical contact.

7. The system of claim 1 , wherein:

the plurality of sensors are a plurality of circuits;

each member is a conductive member moveable relative to a corresponding one of the circuits to close said corresponding one of the circuits.

8. The system of claim 1 , wherein:

the plurality of sensors are an analog sensor;

at least one of the members is moveable from a first position, in which a corresponding analog sensor is caused to deliver a first signal, to a second position in which the corresponding analog sensor is caused to deliver a second signal;

mounting of the first collar to the receiving component causes movement of the at least one member to the first position to cause the first signal;

mounting of the second collar to the receiving component causes movement of the at least one member to the second position to cause the second signal.

9. The system of claim 1 , wherein

the first surgical instrument includes first mechanical actuation elements;

the second surgical instrument includes second mechanical actuation elements;

wherein when the first surgical instrument, manipulator arm and receiving component are assembled, drive elements of the receiving component are arranged to receive drive motion from actuators and transfer the drive motion to the first actuation elements of the first surgical instrument; and

wherein when the second surgical instrument, manipulator arm and receiving component are assembled, drive elements of the receiving component are arranged to receive drive motion from the actuators and transfer the drive motion to the second actuation elements of the second surgical instrument.

10. The system of claim 1 , wherein:

wherein the first pins are arranged such that mounting the first collar to the receiving member causes movement of one of the members by a first distance,

wherein the second pins are arranged such that mounting the second collar to the receiving member causes movement of one of the members by a second distance, and

wherein the first distance and the second distance are different distances.