User's Manual

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TABLE OF CONTENTS
TABLE OF CONTENTS TABLE OF CONTENTS
TABLE OF CONTENTS
1.
OVERVIEW ......................................................................................................................................6
2. AC4424 SPECIFICATIONS.............................................................................................................8
3. SPECIFICATIONS .........................................................................................................................10
3.1 INTERFACE SIGNAL DEFINITIONS .......................................................................................................10
3.2 ELECTRICAL SPECIFICATIONS.............................................................................................................11
3.3 SYSTEM TIMING .................................................................................................................................11
3.3.1 Serial Interface Data Rate.........................................................................................................12
3.3.2 Timing Diagrams.......................................................................................................................13
3.3.3 Maximum Overall System Throughput ......................................................................................15
4. CONFIGURING THE AC4424......................................................................................................15
4.1 EEPROM PARAMETERS ....................................................................................................................15
4.2 CONFIGURING THE AC4424 ..............................................................................................................19
4.3 COMMAND REFERENCE......................................................................................................................20
4.4 AC4424 AT COMMANDS ...................................................................................................................21
4.4.1 Enter AT Command Mode .........................................................................................................21
4.4.2 Exit AT Command Mode............................................................................................................21
4.5 ON-THE-FLY CONTROL COMMANDS (CC COMMAND MODE) ............................................................22
4.5.1 Status Request............................................................................................................................22
4.5.2 Change Channel with Forced Acquisition Sync ........................................................................23
4.5.3 Server/Client..............................................................................................................................23
4.5.4 Sync Channel.............................................................................................................................24
4.5.5 Power-Down..............................................................................................................................25
4.5.6 Power-Down Wake-Up..............................................................................................................25
4.5.7 Broadcast Mode.........................................................................................................................25
4.5.8 Write Destination Address.........................................................................................................26
4.5.9 Read Destination Address..........................................................................................................26
4.5.10 EEPROM Byte Read..................................................................................................................26
4.5.11 EEPROM Byte Write .................................................................................................................27
4.5.12 Reset ..........................................................................................................................................27
5. THEORY OF OPERATION ..........................................................................................................28
5.1 HARDWARE INTERFACE ......................................................................................................................28
5.1.1 TXD (Transmit Data) and RXD (Receive Data) (pins 2 and 3 respectively).............................28
5.1.2 Hop Frame (pin 6).....................................................................................................................28
5.1.3 CTS Handshaking (pin 7) ..........................................................................................................28
5.1.4 RTS Handshaking (pin 8) ..........................................................................................................28
5.1.5 9600 Baud/Packet Frame (pin 12).............................................................................................29
5.1.6 RSSI (pin 13)..............................................................................................................................29
5.1.7 Wr_ENA(EEPROM Write Enable) (pin 14) ..............................................................................30
5.1.8 UP_RESET (pin 15)...................................................................................................................31
5.1.9 Command/Data (pin 17)............................................................................................................31
5.1.10 In Range (pin 20).......................................................................................................................31
5.2 SOFTWARE PARAMETERS ...................................................................................................................32
5.2.1 RF Architecture (Server-Client/Peer-to-Peer) ..........................................................................32
5.2.2 RF Mode ....................................................................................................................................32
5.2.3 Random Back Off.......................................................................................................................33
5.2.4 Duplex Mode .............................................................................................................................33
5.2.5 Interface Timeout/RF Packet Size..............................................................................................34