User's Manual

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Transceiver Response:
Transceiver Response:Transceiver Response:
Transceiver Response:
CCh 44h 41h 54h
4.5
4.54.5
4.5 O
OO
ON
NN
N-
--
-THE
THETHE
THE-
--
-F
FF
FLY
LY LY
LY C
CC
CONTROL
ONTROL ONTROL
ONTROL C
CC
COMMANDS
OMMANDS OMMANDS
OMMANDS (CC C
(CC C(CC C
(CC COMMAND
OMMAND OMMAND
OMMAND M
MM
MODE
ODEODE
ODE)
))
)
The AC4424 transceiver contains static memory that holds many of the parameters that
control the transceiver operation. Using the “CC” command set allows many of these
parameters to be changed during system operation. Because the memory these commands
affect is static, when the transceiver is reset, these parameters will revert back to the
settings stored in the EEPROM.
While in CC Command mode using pin 17 (Command/Data), the RF interface of the
transceiver is still active. Therefore, it can receive packets from remote transceivers while in
CC Command mode and forward these to the OEM Host. While in CC Command mode using
AT Commands, the RF interface of the transceiver is active, but packets sent from other
transceivers will not be received. The transceiver uses Interface Timeout/RF Packet Size
Interface Timeout/RF Packet SizeInterface Timeout/RF Packet Size
Interface Timeout/RF Packet Size to
determine when a CC Command is complete. Therefore, there should be no delay between
each character as it is sent from the OEM Host to the transceiver or the transceiver will not
recognize the command. If the OEM Host has sent a CC Command to the transceiver and an
RF packet is received by the transceiver, the transceiver will send the CC Command response
to the OEM Host before sending the packet. However, if an RF packet is received before the
Interface Timeout expires on a CC Command, the transceiver will send the packet to the OEM
Host before sending the CC Command response.
When an invalid command is sent, the radio scans the command to see if it has a valid
command followed by bytes not associated with the command, in which case the radio
discards the invalid bytes and accepts the command. In all other cases, the radio returns the
first byte of the invalid command back to the user and discards the rest.
The EEPROM parameters and a Command Reference are available in Section 4, Configuring
Section 4, Configuring Section 4, Configuring
Section 4, Configuring
the AC4424
the AC4424the AC4424
the AC4424, of this manual.
4.5.1
4.5.14.5.1
4.5.1 Status Request
Status RequestStatus Request
Status Request
The Host issues this command to request the status of the transceiver.
Host Command:
Host Command:Host Command:
Host Command:
Byte 1 = CCh
Byte 2 = 00h
Byte 3 = 00h
Transceiver Response:
Transceiver Response:Transceiver Response:
Transceiver Response:
Byte 1 = CCh
Byte 2 = Firmware version number
Byte 3 = Data1