Modbus - Motion Detector Bricklet – Tinkerforge

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# Modbus - Motion Detector Bricklet

This is the description of the Modbus protocol for the Motion Detector Bricklet. General information and technical specifications for the Motion Detector Bricklet are summarized in its hardware description.

## API

A general description of the Modbus protocol structure can be found here.

### Basic Functions

`BrickletMotionDetector.``get_motion_detected`

  Function ID: | 1
  Request: | empty payload

  Response:

  - motion -- uint8

  Returns 1 if a motion was detected. How long this returns 1 after a motion was detected can be adjusted with one of the small potentiometers on the Motion Detector Bricklet, see here.

  There is also a blue LED on the Bricklet that is on as long as the Bricklet is in the "motion detected" state.

### Advanced Functions

`BrickletMotionDetector.``get_identity`

  Function ID: | 255
  Request: | empty payload

  Response:

  - uid -- char[8]
  - connected_uid -- char[8]
  - position -- char
  - hardware_version -- uint8[3]
  - firmware_version -- uint8[3]
  - device_identifier -- uint16

  Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

  The position can be 'a', 'b', 'c' or 'd'.

  The device identifier numbers can be found here.

### Callbacks

`BrickletMotionDetector.``CALLBACK_MOTION_DETECTED`

  Function ID: | 2
  Response: | empty payload

  This callback is called after a motion was detected.

`BrickletMotionDetector.``CALLBACK_DETECTION_CYCLE_ENDED`

  Function ID: | 3
  Response: | empty payload

  This callback is called when the detection cycle ended. When this callback is called, a new motion can be detected again after approximately 2 seconds.

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