TREA

Interface for communication between internal and external devices

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Information

  • Patent Grant
  • 8719474
  • Patent Number
    8,719,474
  • Date Filed
    Saturday, December 19, 2009
    15 years ago
  • Date Issued
    Tuesday, May 6, 2014
    10 years ago
Information
Abstract
An interface, for communication between an internal device and an external device, includes two bus lines of a bus for bidirectional data transfer and at least a first control line, by means of which a control signal can be transferred from the external device to the internal device.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a National Stage Application of PCT Application No. PCT/EP2009/009174 filed on Dec. 19, 2009, which claims the benefit of German Patent Application No. DE 10 2009 010 465.8, filed on Feb. 13, 2009, which are hereby incorporated by reference.


BACKGROUND OF THE INVENTION

The invention relates to an interface for communication between an internal device and an external device.


By means of a laser scanner such as is known for example from U.S. Pat. No. 7,430,068, the surroundings of the laser scanner can be optically scanned and measured. The laser scanner can be constructed with a stationary base, for example in order to measure a closed space, or be mounted on a carriage, for example in order to measure a tunnel. In the latter case, the carriage moves through the tunnel, thus resulting in helical scanning. The data of the laser scanner are combined during evaluation with the data about the linear movement of the carriage, which are detected for example by a device which is an external device with respect to the laser scanner functioning as an internal device.


SUMMARY OF THE INVENTION

Embodiments of the present invention are intent on improving an interface of the type mentioned hereinabove.


The interface according to embodiments of the present invention makes it possible to synchronize the data of the internal device with the data of the external device by means of control signals. In order not only to utilize the high speed of the control signals but also to provide the latter with greater information, the control signal is assigned an identification sequence, which is transmitted via the bus and which assigns the control signal to a specific event. Then, the identification sequence may be transmitted and stored at the same time or in a temporally offset manner, i.e., in a preceding or succeeding (time-delayed) mode, with respect to the control signal. It is also possible to define an operation mode beforehand by means of an identification sequence passed on a bus. In order to avoid collisions of the control signals, one respective control line per direction may be provided between the internal device and the external device, while the bus can be used bidirectionally. As the bus, a CAN bus has the advantage that the interface needs only two bus lines. However, other bus systems (USB or the like) are also possible, if appropriate with more than two bus lines. A power supply and a ground in the interface permit connection of smaller external devices without a dedicated power supply.


The internal device may be a portable 3D-measuring instrument, in particular a laser scanner that can optically scan and measure its surroundings.


The external device may be any device which supplies data which are intended to be synchronized expediently with the data of the internal device. If the internal device is a laser scanner, the external device supplies supplementary data, for example non-optical data or data concerning a movement of the laser scanner.


If the laser scanner is mounted on a carriage, the external device can detect the (linear) movement of the carriage. The carriage can travel in an open area or in a closed space, for example a long hall or a tunnel In the open area, the external device can be a GPS receiver. The carriage can travel on rails or on a road. Areas of application are road mapping or tunnel inspection. Thus, an inspection train can travel on a mountain section of railway line with a large number of tunnels, which inspection train travels automatically, for example, and examines the rails for fallen rocks and the tunnel walls for cracks.





BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings, in which:



FIG. 1 shows a basic illustration of the interface;



FIG. 2 shows a schematic illustration of a laser scanner mounted on a carriage, with an interface according to embodiments of the present invention;



FIG. 3 shows a temporal sequence of a control signal on the first control line and the identification sequence of the control signal on the CAN bus; and



FIG. 4 shows a temporal sequence of a control signal on the second control line and the identification sequence of the control signal on the CAN bus.





DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 2, a laser scanner 10 is provided as a device for optically scanning and measuring surroundings of the laser scanner 10. The laser scanner 10 has a measuring head 12 and a base 14. The measuring head 12 is mounted on the base 14 as a unit that can be rotated about a vertical axis. The measuring head 12 has a mirror 16, which can be rotated about a horizontal axis and by means of which a laser beam is emitted into the surroundings and a reflected signal is received. Further details of the measuring head 12 are described for example in U.S. Pat. Nos. 7,193,690 and 7,430,068, the respective disclosure of each being incorporated by reference. The base 14 defines the stationary reference system of the laser scanner 10. An interface 20 is provided at the laser scanner 10, for example, at the base 14, which interface can be integrated into the base 14 structurally, for example.


The interface 20 serves for the communication of the laser scanner 10 as an internal device with an external device 23. In addition to the hardware, the interface 20 is also assigned a communication protocol. Referring to FIG. 1, in the exemplary embodiment, the interface 20 has six terminals, namely two bus lines CANH (high) and CANL (low) of a CAN bus, a first control line SYNC_IN, a second control line SYNC_OUT, a power supply line VCC and a ground GND. The CAN bus is known from the automotive sector and specified correspondingly. The two bus lines CANH and CANL are used bidirectionally for data transfer. A differential data transfer is utilized in order to increase the transfer speed.


The two control lines SYNC_N and SYNC_OUT are used unidirectionally for data transfer. On the first control line SYNC_IN, the laser scanner 10 can receive a control signal (SYNC) from the external device. On the second control line SYNC_OUT, the laser scanner 10 outputs a control signal (SYNC) to the external device 23. The external device 23, if it does not have a dedicated power supply, can be connected to the power supply line VCC (5V and up to 500 mA). The ground GND can be used not only for the power supply but also for the CAN bus and for screening. The interface 20 at the laser scanner 10 may be embodied as a socket into which the plug of a cable 25 can be inserted. The cable 25 is then inserted into a corresponding interface 20 of the external device 23 at the other end.


In accordance with one exemplary operation mode, the external device 23 passes a control signal onto the first control line SYNC_N of the interface 20 of the laser scanner 10 at specific points in time. The laser scanner 10 passes the received control signal into its data stream in real time, whereby it is stored with the data stream. The control signal is followed (or announced) by an identification sequence which is assigned to the control signal and which the external device 23 outputs near-instantaneously (but if appropriate in time-delayed fashion) with respect to the control signal via the CAN bus CANH, CANL. The identification sequence contains the information as to what event the control signal represents. The event can be the transfer of a measured value, for example a distance, an angle or a grey level, or a status message of the external device 23. There are no restrictions in respect of this. The laser scanner 10 likewise passes the identification sequence received (if appropriate in time-delayed fashion) into its data stream (if appropriate in time-delayed fashion), whereby it is stored with the data stream. During the evaluation of the data, it is then possible, by means of the identification sequence, for the control signal to be identified and synchronized with the data received from the measuring head 12.


The laser scanner 10 can correspondingly pass a control signal onto the second control line SYNC_OUT of the interface 20 of the laser scanner 10 at specific points in time, for example if the mirror 16 projects the laser beam towards the measuring head 12 or if other specific positions of the measuring head 12 are attained. The external device 23 receives this control signal via the cable 25. The control signal is again followed by an identification sequence, which the laser scanner 10 outputs (if appropriate in time-delayed manner) via the CAN bus CANH, CANL. The identification sequence again contains the information as to what event the control signal represents, such that the external device 23 can identify the control signal and use it for synchronizing its data.


The operation mode described, in which the identification sequence follows the control signal, is particularly advantageous if a measurement result is intended to be forwarded near-instantaneously. An operation mode is also possible in which the identification sequence assigned to the control signal temporally precedes the control signal and announces the latter. This operation mode is particularly advantageous if the control signal is intended to be used to start an action, for example the start of a data recording. The operation mode (and hence the temporal assignment of control signals and identification sequences) can itself be defined by an identification sequence, i.e., be negotiated between the laser scanner 10 and the external device 23 (generally the bus subscribers). The negotiated operation mode may be defined beforehand for a set of events, or the identification sequence contains explanations concerning the (preceding or succeeding) control signal.


In the exemplary embodiment, the base 14 is mounted on a carriage 27, and the external device 23 serves for path detection of the carriage 27, for example by means of detection of the wheel positions. This arrangement of carriage 27 and laser scanner 10 mounted thereon is used for tunnel inspection or road mapping. The rotational movement of the measuring head 12 and the linear movement of the carriage 27 produce a helical scanning. By means of the interface 20, the data of the external device 23, that is to say the path detection of the carriage 27, and the data of the laser scanner 10 can be synchronized and if appropriate calibrated.


However, the external device 23 can also be any other device which supplies data which are intended to be synchronized expediently with the data of the laser scanner 10.

Claims
  • 1. A laser scanner, comprising: an interface for communication between an internal device and an external device, wherein the interface comprises a bus having two bus lines (CANH, CANL) for bidirectional data transfer and at least a first control line (SYNC_IN) by which a control signal is transferred from the external device to the internal device, and wherein the laser scanner is provided as the internal device, the interface being assigned to the internal device.
  • 2. The laser scanner of claim 1, wherein the two bus lines (CANH, CANL) are part of a CAN bus.
  • 3. The laser scanner of claim 1, wherein the bus further comprises a second control line (SYNC_OUT) by which a control signal is transferred from the internal device to the external device.
  • 4. The laser scanner of claim 1, wherein the first and second control lines (SYNC_IN, SYNC_OUT) provide for unidirectional data transfer.
  • 5. The laser scanner of claim 1, wherein the internal device picks up the control signal transferred by the first control line (SYNC_IN) into its data stream and stores it with the data stream.
  • 6. The laser scanner of claim 3, wherein the control signal on one of the first and second control lines (SYNC_IN, SYNC_OUT) is assigned an identification sequence on the two bus lines (CANH, CANL), wherein the identification sequence contains information as to what event the control signal represents, and wherein the identification sequence is temporally offset with respect to the control signal.
  • 7. The laser scanner of claim 6, wherein the internal device picks up the identification sequence transferred by the two bus lines (CANH, CANL) into its data stream and stores it with the data stream.
  • 8. The laser scanner of claim 6, wherein an operation mode that defines a temporal assignment between the control signals and the identification sequences is transferred by the two bus lines (CANH, CANL).
  • 9. The laser scanner of claim 6, wherein the interface further comprises a power supply line (VCC) and/or a ground (GND).
  • 10. The laser scanner of claim 6, wherein the external device with which the interface communicates is assigned to a carriage on which the laser scanner is mounted.
Priority Claims (1)
Number Date Country Kind
10 2009 010 465 Feb 2009 DE national
PCT Information
Filing Document Filing Date Country Kind 371c Date
PCT/EP2009/009174 12/19/2009 WO 00 12/20/2010
Publishing Document Publishing Date Country Kind
WO2010/091710 8/19/2010 WO A
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Related Publications (1)
Number Date Country
20110113170 A1 May 2011 US