The ZSTAR3 uses a simple time based protocol for an RF transfer of information between sensor boardsand the USB receiver. The protocol is based on a simple star topology for a communication network, withone master point (USB stick) and slaves (sensor boards). It provides time slots for up to 16 sensors. Maindata of a load contains acceleration (X, Y and Z axis) and basic status data. The protocol is built on top ofmodified Section 5.2, Simple Media Access Controller (SMAC) drivers that are available for theMC1319x and MC1321x transceivers families. It is bidirectional, allowing the set up of independentconnections for up to 16 ZSTAR3 demos, together in one RF space (thus, up to 256 sensor boards).All data is transferred in so-called Zpackets. This protocol is primarily targeted at simple demo purposes,allowing a fast transfer of the accelerometer data in short packets with minimum overheads and withminimum battery loads (most of the receive windows eliminated, short transmit packets, etc.).
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