Справочник Пользователя для AeroComm Corporation 4424200
3/23/2006
17
4.5 O
N
-
THE
-F
LY
C
ONTROL
C
OMMANDS
(CC C
OMMAND
M
ODE
)
The LT4424 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.
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 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.
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 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.
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 the
LT4424, of this manual.
LT4424, of this manual.
4.5.1 Status Request
The Host issues this command to request the status of the transceiver.
Host Command:
Byte 1 = CCh
Byte 2 = 00h
Byte 3 = 00h
Transceiver Response:
Byte 1 = CCh
Byte 2 = Firmware version number
Byte 3 = Data1
Where:
Data1 =
Data1 =
00 for Server in Normal Operation
01 for Client in Normal Operation
02 for Server in Acquisition Sync
02 for Server in Acquisition Sync
03 for Client in Acquisition Sync