Multiple Device Setup

Main page

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This page demonstrates a sample system setup involving multiple external devices. Specifically, one National Instruments Data Acquisition (NI-DAQ) device, two force plates, and a recording trigger will be integrated. Only basic step-by-step instructions will be covered in this guide. For detailed explanation of each device integrations, visit the following pages:

• NI-DAQ Setup
• AMTI Force Plate Setup
• Bertec Force Plate Setup

Requirements

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• Motive
• Motive: the Peripheral Device module and the NI-DAQmx plugin (15.1.1 or later).
• Ethernet camera system with the eSync synchronization hub.
• USB NI-DAQ: Supported Devices with external sample clock support.
• Force Plate System: Bertec or AMTI
• Record Trigger device (external device)

Sync Chain Setup Steps

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For general instructions on setting up the mocap system, refer to the Hardware Setup pages. This guide assumesthe camera system and the eSync have been already installed.

Mocap system + Force Plate + NIDAQ + Recoding Trigger setup.

Step 1. [Hardware Setup]

First of all, connect the external devices to the appropriate input or output ports of the eSync.

• NI-DAQ (slave): Connect one of the Output ports of the eSync to an input terminal of the USB NI-DAQ device. The input terminal must support external sample clock signals in order to sync with the clock signal from the eSync. When integrating bare wire DAQ devices, respective ground signals must be separated from the BNC port. Sync Signal: Internal Clock

• Force Plates (slave): Connect the Output ports of the eSync to a sync input port on the force plate amplifier. Sync Signal: Recording Pulse (AMTI) / Recording Gate (Bertec).

- Bertec AM6800: For Bertec systems using the AM6800 amplifier, the eSync's output port connects to the ANALOG OUTPUT port of the amplifier. The female 15-pin D-Sub connector included with the Bertec system must be used to separate the ZERO and SYNC cables. The ZERO cable connects to the eSync's output port, and the SYNC cable connects between force plate amplifiers. See: Bertec Hardware Setup

• Recording Trigger (trigger): Using sync cables, connect the trigger device into one of the Input ports of the eSync.

Step 2. [Hardware Setup] Connect the devices.

Connect the USB cables from the force plates and the NI-DAQ device to the host PC.

Step 3. [Software Setup] Install Peripheral Device module and NI-DAQmx driver

For integrating force plates and NI-DAQ devices, the Peripheral Device module and the NI-DAQmx driver must be installed along with Motive; both of which can be installed during the Motive installation process.

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  Peripheral Device module installation.
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  NI-DAQmx 15.1.1 installation.

Step 4. [Motive] Launch Motive.

If the devices are properly recognized, they will be listed under the Devices pane in Motive.

Step 5. [Motive] Calibrate the position of the force plates in Motive.

Place and fit the CS-400 calibration square on the force plates as shown in the image below. The calibration square will determine the position and orientation of the force plate within the calibrated 3D space; thus, it is important to place the square tightly along the side of the platform. Once the calibration square is placed, right-click on the force plate asset in the Perspective view and click Set Position.

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  CS-400 placed on the force plate. As shown in the image, the CS-400 must be placed on the right-hand corner of the side where the cable is connected.
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  Setting the position of the force plate in Motive.

Step 6. [Motive] Zero the devices.

Right-click on the NI-DAQ device or the force plates either on the Devices pane or on the Perspective View and click Zero. This will tare the devices and set the currently detected voltage/force to zero.

Step 7. [Motive:Synchronization pane]

Now, let's configure the synchronization. Under the Tools tab, open the Synchronization pane. From the drop-down menu, change the sync mode to Custom Synchronization. This mode allows users to configure custom sync settings for integrating, or outputting, external sync signals.

Step 8. [Motive:Synchronization pane:Custom Synchronization] Select the Sync Source.

First of all, you need to select and configure the sync input source. In this setup, the Internal Clock signal of the eSync will be used to synchronize the camera system. Set the Sync Input: Source to Internal Clock.

Step 9. [Motive:Synchronization pane:Custom Synchronization] Configure the Sync Source.

Once the Internal Clock is selected as the sync source, configure the clock signal:

• Clock Freq (Hz): This sets the frequency of the clock signal. In this setup, the clock signal will be used to sync the camera system frame rate and also the acquisition rate of the NI-DAQ devices. Since the NI-DAQ devices usually sample at a higher frame rate, first set the clock frequency to the desired NI-DAQ sampling rate and apply input divider and multiplier for the camera system.

• Input Trigger/Divider/Multiplier: Adjust the input divider and multiplier to derive the camera system frame rate from the configured internal clock signal. The final frame rate will be displayed at the bottom of the Sync Input section. Only the supported camera frame rate can be applied.

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  Sync Input configured to Internal Clock: 1000 Hz. With the input divider and multiplier applied, cameras synchronize at 100 FPS.

Step 10. [Motive:Synchronization pane:Custom Syncrhonization] Configure the Sync Outputs.

Now, configure the output signal into the slave devices. Configure the corresponding output port that each device is connected.

• NI-DAQ: Set the output type of the connected output port to Gated Internal Clock signal. This will set the eSync so that the internal clock is sent out when Motive starts recording.

• Force Plates: Set the output type of the connected output port to Recording Gate (Bertec) or Recording Pulse (AMTI). The force plate systems will synchronize with the recording trigger from the eSync.

AMTI Force plates can also be synchronized through Gater Internal Clock signal. See AMTI Force Plate Setup page for more information.

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  Custom Synchronization: Output signal configured to Gated Internal Clock for the NI-DAQ device and Recording Gate for Bertec force plates.
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Step 11. [Motive:Synchronization pane:Custom Synchronization]] Configure the Remote Trigger device.

Now let's configure the Record Trigger device. Under the Record Triggering section, set the trigger source to the input port that the device is connected to, and select appropriate trigger edge depending on the morphology of the trigger signal.

Step 12. [Motive:Synchronization pane:Custom Synchronization]] Apply the configuration.

Now that all of the sync configurations are set, press Apply.

Step 13. [Motive:Devices pane:NI-DAQ Properties] Configure NI-DAQ properties in Motive

Click on the NI-DAQ device under the Devices pane and configure its sync properties. The following configuration sets the NI-DAQ devices to synchronize its data acquisition with the clock signal from the eSync.

• Use External Clock: True.
• NIDAQExternalClockTerminal: Designate input channel of the NI-DAQ.
• SyncMode: Free Run.

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  NI-DAQ properties and the corresponding sync settings.

Step 14. [Motive:Devices pane:Force Plate Properties]

Click on the Force Plate device under the Devices pane and configure its sync properties. The following configuration sets the force plates to trigger sync to the recording signal from the eSync:

• Record Trigger: Device
• Use External Clock: False
• Sync Mode: Free Run

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  Sample configuration of the Force Plate (AMTI) properties.

Step 15. [Motive]

Now the systems are synchronized. When you start recording in Motive, precisely aligned data will be collected.

Step 16. [Motive] Recording Trigger.

To utilize the external recording trigger device, press the record button in Motive and set it to a standby mode. Then use the device to send the recording trigger to the eSync, which will either initiate or stop recording each time a trigger is received.