Can bus automatic line termination
AssigneeAmerican Power Conversion Corporation
InventorsRoss E. Dozier, Jeffrey Stephen Beam, Eric Topp
Life of this patent
Estimating the term…
Abstract
A network interface includes a receptacle configured to receive a plug, a first contact and a second contact each disposed in the receptacle, and a combination of a resistive element and a normally closed switch arranged in series with each other. The combination is coupled between the first contact and the second contact, and has a first configuration in which the switch is opened responsive to a presence of the plug within the receptacle, and a second configuration in which the switch is closed responsive to an absence of the plug from the receptacle.
Claims20
A network interface, comprising:
- a receptacle configured to receive a plug;
- a first contact and a second contact each disposed in the receptacle;
- and
- a combination of a resistive element and a normally closed switch arranged in series with each other, the combination coupled between the first contact and the second contact, the combination having a first configuration in which the switch is opened responsive to a presence of the plug within the receptacle, and a second configuration in which the switch is closed responsive to an absence of the plug from the receptacle.
A network interface, comprising:
- a receptacle configured to receive a plug;
- a first contact and a second contact each disposed in the receptacle;
- a resistive element selectively coupled between the first contact and the second contact for providing resistive termination between the first contact and the second contact;
- and
- means for detecting the presence and absence of the plug in the receptacle, coupling the resistive element between the first contact and the second contact responsive to detecting the absence of the plug, and decoupling the resistive element from at least one of the first contact and the second contact responsive to detecting the presence of the plug.
A method of terminating a communication bus within a network interface, the method comprising:
- detecting a presence of a plug within a receptacle of the network interface;
- disabling resistive termination between a first contact of the receptacle and a second contact of the receptacle by switchably decoupling a resistive element from at least one of the first contact and the second contact responsive to detecting the presence of the plug within the receptacle;
- detecting an absence of the plug within the receptacle;
- and
- enabling resistive termination between the first contact and the second contact by switchably coupling the resistive element between the first contact and the second contact responsive to detecting the absence of the plug within the receptacle.
Dependencies are inferred from the claim text.