System and method for wireless control of signs
A system includes a master controller disposed on a transit vehicle, a peripheral device disposed on the transit vehicle, a first wireless subsystem communicably coupled to the master controller, and a second wireless subsystem communicably coupled to the peripheral device. The master controller is operable to send a signal to the peripheral device via the first wireless subsystem, the signal comprising a command related to operation of the peripheral device. The peripheral device is operable to receive the signal via the second wireless subsystem and execute the command. The system utilizes a wireless protocol that specifies a unique identification for the system. The master controller and the peripheral device are each configured via the wireless protocol. The configuration includes storage of the unique identification and operability to restrict wireless communication to wireless communication with other devices so configured.
1. A method comprising:
on power up, checking, by a transit-vehicle peripheral device, a transit-vehicle peripheral device programmable identifier;
wherein the transit-vehicle peripheral device programmable identifier is stored as a single value such that:
a specific initial value indicates that no particular transit-vehicle master controller has been assigned to the transit-vehicle peripheral device; and
any value other than the specific initial value identifies a particular transit-vehicle master controller of a particular wireless transit-vehicle network that has been assigned to the transit-vehicle peripheral device;
the transit-vehicle peripheral device wirelessly receiving a command packet;
the transit-vehicle peripheral device determining whether the command packet includes the transit-vehicle peripheral device programmable identifier;
responsive to the command packet including the specific initial value, the transit-vehicle peripheral device wirelessly receiving, from a transit-vehicle master controller of a wireless transit-vehicle network, a wireless transit-vehicle network common code that is common to all transit-vehicle peripheral devices within the wireless transit-vehicle network and storing, by the transit-vehicle peripheral device, the wireless transit-vehicle network common code as the transit-vehicle peripheral device programmable identifier, wherein the wireless transit-vehicle network common code replaces the specific initial value; and
responsive to the command packet not including the transit-vehicle peripheral device programmable identifier, the transit-vehicle peripheral device not accepting the command packet.
2. The method of claim 1 comprising, responsive to a determination that the command packet includes the transit-vehicle peripheral device programmable identifier, the transit-vehicle peripheral device adjusting operation of the transit-vehicle peripheral device as indicated in the command packet.
3. The method of claim 1 , wherein the transit-vehicle peripheral device is synchronized to the particular transit-vehicle master controller.
4. The method of claim 3 , wherein:
the transit-vehicle peripheral device comprises at least one of an electronic sign, a light component, a climate-control component, an audio component and a video component; and
the transit-vehicle peripheral device is operable to receive commands from the particular transit-vehicle master controller.
5. The method of claim 3 , wherein the wireless transit-vehicle network common code is factory-established.
6. The method of claim 3 , wherein the particular wireless transit-vehicle network uses at least two of frequency hopping, fixed frequency and direct sequence spread spectrum.
7. The method of claim 3 , wherein at least some devices within the particular wireless transit-vehicle network transmit data at a rate between 60 and 200 kilobits per second so as to minimize delay spread multi-path effects.
8. The method of claim 3 , wherein at least some devices within the particular wireless transit-vehicle network transmit signals at between 1 and 100 milliwatts of radio frequency power.
9. The method of claim 3 , wherein the specific initial value is zero.
10. The method of claim 1 , wherein the wireless transit-vehicle network common code is indicative of the transit-vehicle peripheral device having the transit-vehicle master controller of the wireless transit-vehicle network assigned thereto.
11. A system comprising a processor and memory, wherein the processor and the memory in combination are operable to implement a method comprising:
on power up, checking, by a transit-vehicle peripheral device, a transit-vehicle peripheral device programmable identifier;
wherein the transit-vehicle peripheral device programmable identifier is stored as a single value such that:
a specific initial value indicates that no particular transit-vehicle master controller has been assigned to the transit-vehicle peripheral device; and
any value other than the specific initial value identifies a particular transit-vehicle master controller of a particular wireless transit-vehicle network that has been assigned to the transit-vehicle peripheral device;
the transit-vehicle peripheral device wirelessly receiving a command packet;
the transit-vehicle peripheral device determining whether the command packet includes the transit-vehicle peripheral device programmable identifier;
responsive to the command packet including the specific initial value, the transit-vehicle peripheral device wirelessly receiving, from a transit-vehicle master controller of a wireless transit-vehicle network, a wireless transit-vehicle network common code that is common to all transit-vehicle peripheral devices within the wireless transit-vehicle network and storing, by the transit-vehicle peripheral device, the wireless transit-vehicle network common code as the transit-vehicle peripheral device programmable identifier, wherein the wireless transit-vehicle network common code replaces the specific initial value; and
responsive to the command packet not including the transit-vehicle peripheral device programmable identifier, the transit-vehicle peripheral device not accepting the command packet.
12. The system of claim 11 , the method comprising, responsive to a determination that the command packet includes the transit-vehicle peripheral device programmable identifier, the transit-vehicle peripheral device adjusting operation of the transit-vehicle peripheral device as indicated in the command packet.
13. The system of claim 11 , wherein the transit-vehicle peripheral device is synchronized to the particular transit-vehicle master controller.
14. The system of claim 13 , wherein:
the transit-vehicle peripheral device comprises at least one of an electronic sign, a light component, a climate-control component, an audio component and a video component; and
the transit-vehicle peripheral device is operable to receive commands from the particular transit-vehicle master controller.
15. The system of claim 13 , wherein the wireless transit-vehicle network common code is factory-established.
16. The system of claim 13 , wherein the particular wireless transit-vehicle network uses at least two of frequency hopping, fixed frequency and direct sequence spread spectrum.
17. The system of claim 13 , wherein at least some devices within the particular wireless transit-vehicle network transmit data at a rate between 60 and 200 kilobits per second so as to minimize delay spread multi-path effects.
18. The system of claim 13 , wherein at least some devices within the particular wireless transit-vehicle network transmit signals at between 1 and 100 milliwatts of radio frequency power.
19. The system of claim 11 , wherein the wireless transit-vehicle network common code is indicative of the transit-vehicle peripheral device having the transit-vehicle master controller of the wireless transit-vehicle network assigned thereto.
20. A computer-program product comprising a non-transitory computer-usable medium having computer-readable program code embodied therein, the computer-readable program code adapted to be executed to implement a method comprising:
on power up, checking, by a transit-vehicle peripheral device, a transit-vehicle peripheral device programmable identifier;
wherein the transit-vehicle peripheral device programmable identifier is stored as a single value such that:
a specific initial value indicates that no particular transit-vehicle master controller has been assigned to the transit-vehicle peripheral device; and
any value other than the specific initial value identifies a particular transit-vehicle master controller of a particular wireless transit-vehicle network that has been assigned to the transit-vehicle peripheral device;
the transit-vehicle peripheral device wirelessly receiving a command packet;
the transit-vehicle peripheral device determining whether the command packet includes the transit-vehicle peripheral device programmable identifier;
responsive to the command packet including the specific initial value, the transit-vehicle peripheral device wirelessly receiving, from a transit-vehicle master controller of a wireless transit-vehicle network, a wireless transit-vehicle network common code that is common to all transit-vehicle peripheral devices within the wireless transit-vehicle network and storing, by the transit-vehicle peripheral device, the wireless transit-vehicle network common code as the transit-vehicle peripheral device programmable identifier, wherein the wireless transit-vehicle network common code replaces the specific initial value; and
responsive to the command packet not including the transit-vehicle peripheral device programmable identifier, the transit-vehicle peripheral device not accepting the command packet.