5
5
5
5////8/2007
8/2007
8/2007
8/2007
21
21
21
21
4.4
4.4
4.4
4.4 AC4424 AT C
AC4424 AT C
AC4424 AT C
AC4424 AT C
OMMANDS
OMMANDS
OMMANDS
OMMANDS
The AT Command mode implemented in the AC4424 creates a virtual version of the
Command/Data pin. The “Enter AT Command Mode” Command asserts this virtual pin Low
(to signify Command Mode) and the “Exit AT Command Mode” Command asserts this virtual
pin High (to signify Data). Once this pin has been asserted Low, all On-the-Fly CC Commands
documented in the manual are supported.
When in AT Command Mode, the user cannot send or receive RF packets. However, an
ambiguity of approximately 10ms exists where, if the “Enter AT Command Mode” command
has been sent to the transceiver at the same time an RF packet is being received, the RF
packet could be sent to the OEM Host before the “Enter AT Command Mode” command
response is sent to the OEM Host.
NOTE: The RF packet size must be set to a minimum of 6 bytes in order to enter Command
NOTE: The RF packet size must be set to a minimum of 6 bytes in order to enter Command
NOTE: The RF packet size must be set to a minimum of 6 bytes in order to enter Command
NOTE: The RF packet size must be set to a minimum of 6 bytes in order to enter Command
mode us
mode us
mode us
mode using the Enter AT Command mode command.
ing the Enter AT Command mode command.
ing the Enter AT Command mode command.
ing the Enter AT Command mode command.
4.4.1
4.4.1
4.4.1
4.4.1 Enter AT Command Mode
Enter AT Command Mode
Enter AT Command Mode
Enter AT Command Mode
Prior to sending the “Enter AT Command Mode” command to the transceiver, the OEM Host
must ensure that the RF transmit buffer of the transceiver is empty (if the buffer is not
empty, the ”Enter AT Command Mode” command will be interpreted as packet data and will
be transmitted out over the RF). This can be accomplished by waiting up to one second
between the last transmit packet and the AT Command. The OEM Host must also ensure
The OEM Host must also ensure
The OEM Host must also ensure
The OEM Host must also ensure
that the RF Packe
that the RF Packe
that the RF Packe
that the RF Packet Size for the transceiver is set to a minimum of six.
t Size for the transceiver is set to a minimum of six.
t Size for the transceiver is set to a minimum of six.
t Size for the transceiver is set to a minimum of six. The Enter AT
Command mode command is as follows:
OEM Host Command:
OEM Host Command:
OEM Host Command:
OEM Host Command:
41h 54h 2Bh 2Bh 2Bh 0Dh
Transceiver Response:
Transceiver Response:
Transceiver Response:
Transceiver Response:
CCh 43h 4Fh 4Dh
4.4.2
4.4.2
4.4.2
4.4.2 Exit AT Command Mode
Exit AT Command Mode
Exit AT Command Mode
Exit AT Command Mode
To exit AT Command Mode, the OEM Host should send the following command to the
transceiver:
OEM Host Command:
OEM Host Command:
OEM Host Command:
OEM Host Command:
CCh 41h 54h 4Fh 0Dh
