The hx19msV3.1sio has the same features as the hx19msV3.1 in addition the user can apply TTL control of the hx19 device network through the micromatch window seen on the right. Furthermore the user also has the ability to synchronize the device with a TTL pulse applied to one of the pins. This allows the system to be synchronized with video filming frames real time. Like the standard hx19msV3.1 the sampling rate is adjustable so the activity can be user fitted into video frames. By using the TTL sio (serial i/o) the user has the same control over the Hx19 network using computer devices that don't have USB, as those who do. All other specs and features described for the hx19ms3.1 apply also to the hx19msV3.1sio.