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:
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.
First of all, connect the external devices to the appropriate input or output ports of the eSync.
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
Connect the USB cables from the force plates and the NI-DAQ device to the host PC.
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.
If the devices are properly recognized, they will be listed under the Devices pane 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.
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.
Now, let's configure the synchronization setup. This is done through configuring the properties of the eSync. Open the Devices pane and the Properties pane. Select the eSync under the list of devices and its properties will be listed out in the Properties pane. Here, you can adjust the properties to change the sync source, sync input/output behaviors.
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.
Once the Internal Clock is selected as the sync source, configure the clock signal:
Now, configure the output signal into the slave devices. Configure the corresponding output port that each device is connected.
AMTI Force plates can also be synchronized through Gater Internal Clock signal. See AMTI Force Plate Setup page for more information.
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.
Now that the eSync properties have been configured, the sync chain of the connected devices should be set up. Next step is to configure the properties of the external devices.
Click on the NI-DAQ device under the Devices pane and open the Properties pane to configure its sync properties. The following configuration sets the NI-DAQ devices to synchronize its data acquisition with the clock signal from the eSync. Please keep in mind that NI-DAQ will start collecting data only when Motive starts recording.
Click on the Force Plate device under the Devices pane and open the Properties pane to configure its sync properties. The following configuration sets the force plates to trigger sync to the recording signal from the eSync:
Now the systems are synchronized. When you start recording in Motive, precisely aligned data will be collected.
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.