AeroComm Corporation AC4490 Benutzerhandbuch
T H E O R Y O F O P E R A T I O N
8
C o m m a n d M o d e
A radio will enter Command Mode when data is received over the serial interface from the OEM Host and either the
Command/Data pin (pin 17) is logic Low or the received data contains the “AT+++” (Enter AT Command Mode)
command. Once in Command Mode, all data received by the radio is interpreted as command data. Command Data
can be either EEPROM Configuration or On-The-Fly commands.
Command/Data pin (pin 17) is logic Low or the received data contains the “AT+++” (Enter AT Command Mode)
command. Once in Command Mode, all data received by the radio is interpreted as command data. Command Data
can be either EEPROM Configuration or On-The-Fly commands.
F i g u r e 1 : P e n d i n g R F a n d D a t a i n B u f f e r F l o w
A P I C O N T R O L
API Control is a powerful feature that the AC4490 offers. When enabled, the API Receive Packet, API Transmit Packet,
API Send Data Complete and Enhanced API Receive Packet features provide dynamic packet routing and packet
accounting ability to the OEM Host, thereby eliminating the need for extensive programming on the OEM Host side.
This ability of the protocol makes it ideal for any legacy system. API operation utilizes specific packet formats;
API Send Data Complete and Enhanced API Receive Packet features provide dynamic packet routing and packet
accounting ability to the OEM Host, thereby eliminating the need for extensive programming on the OEM Host side.
This ability of the protocol makes it ideal for any legacy system. API operation utilizes specific packet formats;
Receive Mode
Broadcast
Packet
Receive full
packet and
check CRC
Addressed Packet
Matching
Destination
MAC
Validate CRC
Duplicate
Packet
Send RF
Acknowledge
Send Packet over
RF
Duplicate
Packet
Discard Packet
Discard Packet
Send Packet over
RF
Pending RF
Received
Yes
Yes
Yes
Yes
Yes
Yes
R e c e iv e M o d e
P in 1 7 L o w
D a ta in B u ffe r
A T + + +
R F D a ta
B ro a d c a s t P a c k e t
A d d re s s e d P a c k e t
T ra n s m it P a c k e t
T ra n s m it P a c k e t
D e c re m e n t
B ro a d c a s t
A tte m p ts
B ro a d c a s t
A tte m p ts = 0
R e c e iv e A C K
D e c re m e n t
T ra n s m it A tte m p ts
T ra n s m it
A tte m p ts = 0
C o m m a n d /D a ta
M o d e