RFM DNT500 Series, Руководство по интеграции, Страница: 3 / 43

TABLE OF CONTENTS
1. INTRODUCTION................................................................................................................ 1
1.1 Why Spread Spectrum?................................................................................................... 1
1.2 Frequency Hopping versus Direct Sequence .................................................................. 2
2.
DNT500 RADIO OPERATION .......................................................................................... 4
2.1 Network Synchronization and Registration .................................................................... 4
2.2 Transparent and Protocol Serial Port Modes................................................................... 4
2.3 RF Data Communications ............................................................................................... 5
2.4 RF Transmission Error Control....................................................................................... 5
2.5 Network Configurations .................................................................................................. 6
2.5.1 Point-to-Point Network Operation .......................................................................... 6
2.5.2 Point-to-Multipoint Network Operation.................................................................. 7
2.6 Full-Duplex Serial Data Communications ...................................................................... 7
2.7 Channel Access ............................................................................................................... 7
2.7.1 CSMA Modes.......................................................................................................... 8
2.7.2 TDMA Modes ......................................................................................................... 9
2.7.3 Network Configuration Planning .......................................................................... 10
2.7.4 Serial Port Operation ............................................................................................. 12
2.7.5 Sleep Mode............................................................................................................ 13
3. DNT500 HARDWARE...................................................................................................... 14
3.1 Specifications ................................................................................................................ 15
3.2 Module
Interface ........................................................................................................... 16
3.3 Input Voltages ............................................................................................................... 17
3.4 ESD and Transient Protection ....................................................................................... 17
3.5 Interfacing to 5 V Logic Systems.................................................................................. 18
3.6 Power-On Reset Requirements ..................................................................................... 18
3.7 Analog RSSI Output...................................................................................................... 18
3.8 Mounting and Enclosures.............................................................................................. 18
3.9 Connecting Antennas .................................................................................................... 19
3.10 Labeling and Notices..................................................................................................... 19
4.
PROTOCOL MESSAGES ................................................................................................. 20
4.1 Protocol Message Formats ............................................................................................ 20
4.1.1 Serial message types.............................................................................................. 20
4.1.2 Escape sequence.................................................................................................... 22
4.1.3 CFG select pin ....................................................................................................... 23
4.1.4 Flow control .......................................................................................................... 23
4.1.5 Protocol mode data message example................................................................... 23
4.2 Configuration Registers................................................................................................. 23
4.2.1 Bank 0 - Transceiver Setup ................................................................................... 24
4.2.2 Bank 1 - System Settings ...................................................................................... 26
4.2.3 Bank 2 - Status Registers (read only)................................................................... 28
4.2.4 Bank 3 - Serial...................................................................................................... 30