Current modulation-based communication from slave device
View Patent ↗Current modulation-based talkback in a system in which the background noise in the level of current draw is minimized such that the talkback is effected with a desirably high signal-to-noise ratio, such as by the master device holding the system voltage low such that the slave devices will not be performing tasks that would cause the current draw on the system to have an undesirable level of background noise, or, in an electronic blasting system, by preventing all other detonators from performing tasks that would create an undesirable background current draw when a particular detonator is talking back.
1. An electrically-connected system for modulation-based talkback from a slave device to a master device comprising:
a) a master device
b) a bus; and,
c) more than one slave device configured and/or programmed to transmit data to said master device through current modulation-based talkback, wherein said current modulation-based talkback includes energy differentials between states, and said energy differentials are supplied by power directly derived from said master device;
wherein the system has a background level of current draw noise and has a low voltage state and a high voltage state, and is configured and/or programmed to hold the voltage level of the system at said low such that the background level of current draw noise in said system is held low when it is desired that a slave device talkback to said master device.
2. The electrically-connected system of claim 1 , wherein said system is an electronic blasting system, said slave device is an electronic detonator, and said master device is a blasting machine.
3. The system of claim 2 , wherein said system is configured and/or programed to prevent communications from the master device to slave device from occurring simultaneously with communications to the master device from slave devices.
4. A method of modulation-based talkback from a slave device to a master device comprising the step of using the electrically-connected system of claim 1 .
5. The method of claim 4 , wherein said method includes the step of establishing a limitation in said electrically-connected system to prevent all slave devices, other than a slave device that is talking back to the master device, from drawing current above a predetermined maximum noise level below which accurate reception of talkback data by the master device is ensured.
6. The method of claim 5 , wherein said step of establishing a limitation in said electrically-connected system includes the step of providing in said slave devices a storage capacitor and a communication interface that includes one or more full wave rectifier bridge diodes.
7. The method of claim 6 , wherein said master device is an electronic blasting machine and said slave devices are electronic detonators.
8. The method of claim 5 , wherein said master device is an electronic blasting machine and said slave devices are electronic detonators.
9. The system of claim 8 , wherein said system is configured and/or programmed to prevent communications from the master device to slave devices from occurring simultaneously with communications to the master device from slave devices.
10. The electrically-connected system of claim 1 , wherein said slave device includes a storage capacitor and a communication interface.
11. The electrically-connected system of claim 1 , wherein said system is configured and/or programmed such that only a slave device that is talking back to the master device can draw current above a predetermined maximum noise level.
12. The electrically-connected system of claim 1 , wherein said current modulation-based talkback utilizes digital data representation.
13. The system of claim 1 , wherein said system is configured and/or programmed to prevent communications from the master device to slave devices from occurring simultaneously with communications to the master device from slave devices.
14. A slave device for use in an electrically connected system including a master device, a bus, and more than one slave device, and having a background level of current draw noise and a low voltage state and a high voltage state, said device configured and/or programmed to talkback to said master device by current modulation, wherein said current modulation includes energy differentials between states, and said energy differentials are supplied by power directly derived from said master device, and wherein said device is further configured and/or programmed to talkback to said master device when the voltage level of said system is held at said low such that said background level of current draw noise in said system is low.
15. The slave device of claim 14 , wherein said slave device is configured and/or programmed so that it can only draw current above a predetermined maximum noise level when it is talking back to the master device.
16. The slave device of claim 14 , wherein said slave device includes a storage capacitor and a communication interface.
17. The slave device of claim 16 , wherein said system is an electronic blasting system, and said slave device is an electronic detonator.
18. The slave device of claim 14 , wherein said communication interface includes one or more full wave rectifier bridge diodes.
19. The slave device of claim 14 , wherein said system and/or slave device is configured and/or programmed to prevent communications from the master device to slave devices from occurring simultaneously with communications to the master device from slave devices.
20. The slave device of claim 14 , wherein said system is an electronic blasting system, and said slave device is an electronic detonator.