Configuring communications for a load control system
A load control system may include multiple control devices that may send load control messages to load control devices for controlling an amount of power provided electrical loads. To prevent collision of the load control messages, the load control messages may be transmitted using different wireless communication channels. Each wireless communication channel may be assigned to a load control group that may include control devices and load control devices capable of communicating with one another on the assigned channel. A control device may send load control messages to a load control device within a transmission frame allocated for transmitting load control messages. The transmission frame may include equal sub-frames and load control messages may be sent at a random time within each sub-frame. Control devices may detect a status event within a sampling interval to offset transmissions from multiple control devices based on detection of the same event.
1. A control device for controlling an amount of power provided to an electrical load, the control device comprising:
a communication circuit configured to transmit information; and
a control circuit in communication with the communication circuit, the control circuit configured to:
detect a first status event during a first sampling time interval;
generate, based on the first status event, a load control message configured to cause an adjustment of the amount of power provided to the electrical load;
determine a random time at which to transmit the load control message;
prior to an occurrence of the random time, start a second sampling time interval;
detect a second status event during the second sampling time interval;
determine whether the second status event is different from the first status event; and
based on whether the second status event is different from the first status event, determine whether to transmit the load control message at the random time using the communication circuit.
2. The control device of claim 1 , wherein the control circuit is further configured to:
determine not to transmit the load control message when the second status event is determined to be different from the first status event.
3. The control device of claim 1 ,
wherein the load control message comprises a first load control message; and
wherein the control circuit is further configured to:
when the second status event is determined to be different from the first status event:
determine not to transmit the first load control message;
generate a second load control message based on the second status event; and
transmit the second load control message.
4. The control device of claim 1 , wherein the control circuit is further configured to:
when the second status event is determined not to be different from the first status event, transmit the load control message using the communication circuit.
5. The control device of claim 1 , wherein the communication circuit is configured to wirelessly communicate the information.
6. The control device of claim 1 , wherein the control circuit is further configured to:
when the second status event is determined to be different from the first status event, determine whether the second status event indicates a status that existed before the first status event; and
determine not to transmit the load control message when the second status event indicates a status that existed before the first status event.
7. The control device of claim 1 , further comprising:
an input circuit operably connected to the control circuit and that is configured to detect status events and to communicate indications of the status events to the control circuit; and
wherein to detect the first and the second status events comprises to receive by the control circuit indications of the first and the second status events from the input circuit.
8. The control device of claim 7 , wherein the input circuit comprises a daylight sensor circuit, an occupancy sensor circuit, a temperature sensor circuit, or a remote control.
9. The control device of claim 1 , wherein to determine whether the second status event is different from the first status event comprises to determine whether the second status event differs from the first status event by at least a predetermined amount.
10. A method comprising:
detecting, by a control circuit, a first status event during a first sampling time interval;
generating, by the control circuit, a load control message based on the first status event, the load control message configured to cause a control device to adjust an amount of power provided to an electrical load;
determining, by the control circuit, a random time at which to transmit the load control message;
starting, by the control circuit, a second sampling time interval prior to an occurrence of the random time;
detecting, by the control circuit, a second status event during the second sampling time interval;
determining, by the control circuit, whether the second status event is different from the first status event; and
determining, by the control circuit, whether to transmit the load control message at the random time to the control device based on whether the second status event is different from the first status event.
11. The method of claim 10 , wherein detecting the first status event comprises:
detecting, by a daylight sensor, a first daylight light reading; and
communicating, by the daylight sensor, to the control circuit, an indication of the first daylight light reading.
12. The method of claim 11 , wherein detecting the second status event comprises:
detecting, by the daylight sensor, a second daylight light reading; and
communicating, by the daylight sensor, to the control circuit, an indication of the second daylight light reading.
13. The method of claim 10 , further comprising:
determining, by the control circuit, not to transmit the load control message when the second status event is determined to be different from the first status event.
14. The method of claim 10 , further comprising:
when the second status event is determined to be different from the first status event, determining, by the control circuit, whether the second status event indicates a status that existed before the first status event; and
determining, by the control circuit, not to transmit the load control message when the second status event indicates a status that existed before the first status event.
15. The method of claim 10 ,
wherein the load control message comprises a first load control message; and
wherein the method further comprises:
when the second status event is determined to be different from the first status event:
determining, by the control circuit, not to transmit the first load control message;
generating, by the control circuit, a second load control message based on the second status event; and
transmitting, by the control circuit, the second load control message to the control device.
16. The method of claim 10 , further comprising:
transmitting, by the control circuit, the load control message to the control device when the second status event is determined not to be different from the first status event.
17. The method of claim 10 , wherein determining whether the second status event is different from the first status event comprises determining whether the second status event differs from the first status event by at least a predetermined amount.
18. A sensor comprising:
a sensor circuit configured to detect events;
a communications circuit configured to transmit information; and
a control circuit communicatively coupled to the sensor circuit and the communications circuit, the control circuit configured to:
detect a first event via the sensor circuit during a first time interval;
generate, based on the first event, a message for causing an adjustment of an amount of power provided to an electrical load;
determine a random time at which to transmit the message;
prior to an occurrence of the random time, start a second time interval;
detect a second event via the sensor circuit during the second time interval;
determine whether the second event is different from the first event; and
based on whether the second event is different from the first event, determine whether to transmit the message at the random time using the communications circuit.
19. The sensor of claim 18 , wherein the sensor circuit comprises a daylight sensor circuit, an occupancy sensor circuit, a temperature sensor circuit, or a button.
20. The sensor of claim 18 , wherein the control circuit is further configured to determine not to transmit the message when the second status event is determined to be different from the first status event.
21. The sensor of claim 18 , wherein the control circuit is further configured to:
when the second status event is determined to be different from the first status event, determine whether the second status event indicates a status that existed before the first status event; and
determine not to transmit the message when the second status event indicates a status that existed before the first status event.
22. The sensor of claim 18 ,
wherein the message comprises a first message; and
wherein the control circuit is further configured to:
when the second status event is determined to be different from the first status event:
determine not to transmit the first message;
generate a second message based on the second status event; and
transmit the second message.
23. The sensor of claim 18 , wherein the control circuit is further configured to;
when the second status event is determined not to be different from the first status event, transmit the message using the communications circuit.
24. The sensor of claim 18 , wherein to determine whether the second event is different from the first event comprises to determine whether the second event differs from the first event by at least a predetermined amount.