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Integration Guide

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Author: Radio Group
Date: February 11
th
, 2014
Revision: March 4
th
, 2015
Subject: Integration Guide – Mizar Radio Module 915 MHz
Page 5 of 11
Operational description
The equipment is a radio module to be integrated inside cordless devices.
It is based upon an FSK ( Frequency Shift Keying Modulation ) Half-Duplex transceiver working in the ISM
band from 902 to 928 MHz.
The radio module has a UART interface to exchange data and commands.
Working modes
Radio module can operate in the follow working modes :
Low Speed, Low Power, fixed channel (among 25 channels)
o FSK, Bitrate 36864 bps, RZ Manchester encoded, Frequency deviation +/- 75KHz
Low Speed, Frequency Hopping Mode over 25 channels
o FSK, Bitrate 36864 bps, RZ Manchester encoded, Frequency deviation +/- 75KHz
High Speed, Digital Transmission Mode, fixed channel (among 12 channels)
o FSK, Bitrate 500,000 bps, NRZ, Frequency deviation +/- 220KHz
High Speed, Digital Transmission + frequency agility Mode over 12 channels
o FSK, Bitrate 500,000 bps, NRZ, Frequency deviation +/- 220KHz
Default mode after power-up is Low Speed Low Power mode.
Radio module can receive commands to allow to change its working mode.
Functional states
Radio module can be set in one of the following states during operation:
Idle State
Radio module stays in low power receiving mode with a limited capability to receive data. RF transmission
is not allowed while radio is set in Idle state.
Receive State
It is the normal default state. In this state the radio receives the RF packets, decodes the packets and sends
them to the Host device. In this mode the transceiver checks continuously the RF signal and demodulates
it. The demodulated and filtered signal is sent to the microcontroller inside the radio module which
decodes it and sends decoded data to the Host by means of the UART interface. Only valid demodulated
data packets are sent to the Host.
Transmission State
This state is enabled from the host when it needs to transmit data. The transmission state is enabled
sending a data packet to the radio module over the UART interface. The microcontroller in the radio
module checks for the integrity of the data packet and enables the transceiver to modulate and transmit to
the RF interface, preceded by a short preamble burst. Radio module exits automatically from this state
when the complete packet has been transmitted, and returns to the receive state.