RFD900x Data Sheet
www.rfdesign.com.au
8
Last update 09/07/2018
S22
ANTMODE
0= Antenna 1 1= Antenna 1 TX and
antenna 2 RX 2= Diversity
2
2
0
No
Table 3-3: RFD900x parameters
Notes:
1
Injects RSSI packet when MAVLink protocol used and heartbeat packet detected.
3.1
Setting up data encryption
The 128-bit AES data encryption may be set, enabled and disabled using the AT commands (see Table
3.1). The encryption key can be any 32-character hexadecimal string.
To encrypt a device, the encryption mode must first be enabled by typing ‘ATS15=1’ in the command
terminal. Once the encryption mode is active, an encryption key may be set after typing ‘AT&E’ into
the command terminal. The encryption key may be of any 32-character hexadecimal string of the users
choosing. Any devices with different encryption settings will not communicate.
After entering command mode, send the following commands to set encryption on using an arbitrary
32 hexadecimal character key. For example:
ATS15=1
AT&E=5AEEF103125C0AA233678909160111CA
AT&E=1234567890ABCDEF1234567890ABCDEF
AT&W
ATZ
3.2
Setting the air data rate
An air speed of 64kps will give a maximum range of about 40km in open space depending on antenna
configurations, terrain and weather. Reducing the air speed can help to increase the range and link
quality limits the data throughput.
Considerations for the air speed setting:
•
The desired range
•
The amount of data across the link
•
Whether you send data in one direction or both
•
Whether you have enabled ECC or not
•
Whether you have adaptive flow control
