Current modulation-based communication for slave device
First Claim
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1. A method of current modulation-based talkback from a slave device to a master device comprising the following steps:
- a) establishing an electrically connected system that includes a master device and more than one slave device, and has a background level of current draw noise;
b) holding the background level of current draw noise in said system low when it is desired that a slave device talkback to said master device; and
,c) during step b), modulating the current flowing through a slave device such that said modulation corresponds to data desired to be transmitted to said master device;
wherein said system has a low voltage state and a high voltage state, and step b) includes the step of holding the voltage level of the system low during the entire period of talkback.
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Abstract
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.
30 Citations
9 Claims
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1. A method of current modulation-based talkback from a slave device to a master device comprising the following steps:
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a) establishing an electrically connected system that includes a master device and more than one slave device, and has a background level of current draw noise; b) holding the background level of current draw noise in said system low when it is desired that a slave device talkback to said master device; and
,c) during step b), modulating the current flowing through a slave device such that said modulation corresponds to data desired to be transmitted to said master device;
wherein said system has a low voltage state and a high voltage state, and step b) includes the step of holding the voltage level of the system low during the entire period of talkback. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification