Broadcast serial bus termination
AssigneeSiemens Aktiengesellschaft
InventorKarstein Kristiansen
Life of this patent
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Abstract
A subsea broadcast serial bus system includes a broadcast serial bus having a first signal line and a second signal line. One or more nodes are connected in parallel to the first signal line and the second signal line of the broadcast serial bus. Each node connects the first signal line to the second signal line via a node impedance. A subsea node connected to the broadcast serial bus includes an adjustable impedance that may be adjusted based on the number of nodes connected to the broadcast serial bus.
Claims20
A broadcast serial bus termination circuit for a broadcast serial bus, the broadcast serial bus having a variable number of nodes connected thereto, wherein each node of the variable number of nodes is connected in parallel to a first signal line and a second signal line of the broadcast serial bus, wherein each node of the variable number of nodes connects the first signal line to the second signal line via a node impedance and wherein the broadcast serial bus is configured for operation with a predetermined bus impedance, the broadcast serial bus termination circuit comprising:
- an adjustable impedance connected, in operation, between the first signal line and the second signal line of the broadcast serial bus;
- and
- an adjusting unit configured for adjusting the adjustable impedance based on a number of the nodes connected to the broadcast serial bus, such that a total impedance of the broadcast serial bus corresponds to the predetermined bus impedance for different numbers of nodes.
A subsea node for a broadcast serial bus, the broadcast serial bus having a variable number of nodes connected thereto, wherein each node of the variable number of nodes is connected in parallel to a first signal line and a second signal line of the broadcast serial bus, wherein each node of the variable number of nodes connects the first signal line to the second signal line via a node impedance, and wherein the broadcast serial bus is configured for operation with a predetermined bus impedance, the subsea node comprising:
- a broadcast serial bus termination circuit that is, in operation, connected to the first signal line and the second signal line, wherein the broadcast serial bus termination circuit comprises:
- an adjustable impedance connected, in operation, between the first signal line and the second signal line of the broadcast serial bus;
- and
- an adjusting unit configured for adjusting the adjustable impedance based on a number of the nodes connected to the broadcast serial bus, such that a total impedance of the broadcast serial bus corresponds to the predetermined bus impedance for different numbers of nodes.
A subsea broadcast serial bus system comprising:
- a broadcast serial bus having a first signal line and a second signal line;
- one or more nodes connected in parallel to the first signal line and the second signal line of the broadcast serial bus, wherein each node of the one or more nodes connects the first signal line to the second signal line via a node impedance;
- and
- a subsea node connected to the first signal line and the second signal line and terminating the broadcast serial bus;
- wherein the subsea node comprises:
- a broadcast serial bus termination circuit that is, in operation, connected to the first signal line and the second signal line;
- and
- wherein the broadcast serial bus termination circuit comprises:
- an adjustable impedance connected, in operation, between the first signal line and the second signal line of the broadcast serial bus;
- and
- an adjusting unit configured for adjusting the adjustable impedance based on a number of the nodes connected to the broadcast serial bus, such that a total impedance of the broadcast serial bus corresponds to the predetermined bus impedance for different numbers of nodes.
A method of terminating a broadcast serial bus, the method comprising:
- determining a number of nodes connected to the broadcast serial bus;
- adjusting an impedance of a node connected between a first signal line and a second signal line of the broadcast serial bus based on the determined number of connected nodes;
- wherein the adjusting of the impedance is performed such that a total impedance on the broadcast serial bus corresponds to a predetermined bus impedance at which the broadcast serial bus is to be operated.
Dependencies are inferred from the claim text.