Signal transmission system for a measurement device
First Claim
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1. A measurement apparatus, comprising;
- a measurement probe comprising a first station, anda coordinate positioning apparatus comprising a second station,wherein the first station and the second station communicate with one another using a spread spectrum radio link,the first station is operable in a normal mode for transmitting information relating to measurement events and in a power saving mode in which a request signal is periodically transmitted, andwhen the first station is operating in the power saving mode, the second station responds to the request signal by transmitting a signal that instructs the first station to enter the normal mode.
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Abstract
A transmission system for a measurement device on a coordinate positioning apparatus comprises a station mounted on the measuring device and another station mounted on the coordinate positioning apparatus, wherein the station and the another station communicate with each other using a spread spectrum radio link, for example, frequency hopping. The station on the probe sends a regular signal and on receiving the signal the another station on the coordinate positioning apparatus synchronises its clock and sends an acknowledgement signal. Measurement data is either sent in the regular signal or in a measurement event driven signal.
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Citations
20 Claims
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1. A measurement apparatus, comprising;
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a measurement probe comprising a first station, and a coordinate positioning apparatus comprising a second station, wherein the first station and the second station communicate with one another using a spread spectrum radio link, the first station is operable in a normal mode for transmitting information relating to measurement events and in a power saving mode in which a request signal is periodically transmitted, and when the first station is operating in the power saving mode, the second station responds to the request signal by transmitting a signal that instructs the first station to enter the normal mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A transmission system for a measurement device for a coordinate positioning apparatus, comprising:
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a first station for mounting with one of the measurement device and the coordinate positioning apparatus; and a second station for mounting with the other of the measurement device and the coordinate positioning apparatus; wherein the first station and the second station communicate with one another using a spread spectrum radio link, the first station can be placed in a normal mode or in a power saving mode that consumes less power than the normal mode, the first station transmits regular signals in the power saving mode and each regular signal asks if the first station should change mode, and the first station changes mode to the normal mode when the first station receives an affirmative response from the second station. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A measurement apparatus, comprising;
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a measurement probe comprising a first station, and a coordinate positioning apparatus comprising a second station, wherein the first station communicates with the second station via a spread spectrum radio link, the first station is arranged to transmit a message to the second station at a first power level, and if the second station does not receive the message, the message is retransmitted by the first station at a second power level, the second power level being higher than the first power level.
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Specification