AT commands
RF interfacing commands
Digi XBee® 3 802.15.4 RF Module User Guide
141
Note
If operating on channel 26 (
CH
= 0x1A), output power will be capped and cannot exceed 8 dBm
regardless of the
PL
setting.
Parameter range
0 - 4
The following table shows the TX power versus the
PL
setting.
PL setting
XBee 3 TX power
XBee 3-PRO TX power
4
8 dBm
19 dBm
3
5 dBm
15 dBm
2
2 dBm
8 dBm
1
-1 dBm
3 dBm
0
-5 dBm
-5 dBm
Default
4
PP (Output Power in dBm)
Display the operating output power based on the current configuration (channel and
PL
setting). The
values returned are in dBm, with negative values represented in two's complement; for example:
-5 dBm = 0xFB.
Parameter range
0 - 0xFF [read-only]
Default
N/A
CA (CCA Threshold)
Defines the Clear Channel Assessment (CCA) threshold. Prior to transmitting a packet, the device
performs a CCA to detect energy on the channel. If the device detects energy above the CCA
threshold, it will not transmit the packet.
The
CA
parameter is measured in units of -dBm. The CCA threshold is set upon device initialization,
any change to the CCA threshold must be written to flash with the
WR
command and the module
reset (power cycle or
FR
command) before the new threshold is observed.
You can set
CA
to 0 to disable CCA; this can improve latency but may cause interference with other 2.4
GHz devices when transmitting.
Parameter range
0 (disabled), 0x28 - 0x64 (-dBm)
Default
0x41