AT commands Diagnostic commands
XBee®-PRO 900HP/XSC RF Modules
80
RR (Unicast Mac Retries)
Set or read the maximum number of MAC level packet delivery attempts for unicasts. If RR is non-
zero, the sent unicast packets request an acknowledgment from the recipient. Unicast packets can
be retransmitted up to RR times if the transmitting device does not receive a successful
acknowledgment.
Parameter range
0 - 0xF
Default
0x0A (decimal 10)
ED (Energy Detect)
Starts an energy detect scan. This command accepts an argument to specify the time in milliseconds
to scan all channels. The device loops through all the available channels until the time elapses. It
returns the maximal energy on each channel, a comma follows each value, and the list ends with a
carriage return. The values returned reflect the energy level that ED detects in -dBm units.
Parameter range
0 - 0xFF
Default
0xA
Diagnostic commands
The following commands are diagnostic commands.
BC (Bytes Transmitted)
The number of RF bytes transmitted. The firmware counts every byte of every packet, including
MAC/PHY headers and trailers. The purpose of this count is to estimate battery life by tracking time
spent performing transmissions.
This number rolls over to 0 from 0xFFFF.
You can reset the counter to any unsigned 16-bit value by appending a hexadecimal parameter to the
command.
Parameter range
0 - 0xFFFF
Default
0
DB (Last Packet RSSI)
Reports the RSSI in -dBm of the last received RF data packet. DB returns a hexadecimal value for the -
dBm measurement.
For example, if DB returns 0x60, then the RSSI of the last packet received was -96 dBm.
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