Digi XBee Product Manual

Command descriptions for the XBee/XBee-PRO RF Module
XBee / XBee-PRO RF Modules 802.15.4 Product Manual 63
CA (CCA Threshold) command
<RF Interfacing> CA command is used to set and read CCA thresholds.
Prior to transmitting a packet, a CCA is performed to detect energy on the transmit channel. If the
detected energy is above the CCA Threshold, the RF module will not transmit the packet.
The values for CCA for Europe are shown in the following table:
CC (Command Sequence Character) command
<AT Command Mode Options> The CC command is used to set and read the ASCII character used
between guard times of the AT Command Mode Sequence (GT + CC + GT). This sequence enters the
RF module into AT Command Mode so that data entering the module from the host is recognized as
commands instead of payload.
The AT Command Sequence is explained further in the AT Command Mode on page 33.
Table 18: Parameters sent Versus parameters stored
BD Parameter Sent (HEX) Interface Data Rate (b/s) BD Parameter Stored (HEX)
0 1200 0
4 19,200 4
7 115,200* 7
12C 300 12B
1C200 115,200 1B207
* The 115,200 baud rate setting is actually at 111,111 baud (-3.5% target UART speed).
AT command: ATCA
Parameter range: 0 - 0x50 [-dBm]
Default parameter value: 0x2C
(-44 decimal dBm)
Minimum firmware version required: v1.x80
Radio HEX value Sets to level (dBm)
XBee 0x34 -52 dBm
XBee-PRO 0x3B -59 dBm
AT command: ATCC
Parameter range: 0 - 0xFF
Default parameter value: 0x2B (ASCII “+”)
Related command: GT (Guard Times)

Digi XBee Specifications

General

Operating Frequency	2.4 GHz
RF Data Rate	250 kbps
Model	XBee S2C
Category	Control Unit
Operating Voltage	2.1 to 3.6V DC
Operating Temperature	-40 to +85 °C
Interface	UART
Dimensions	24.38 x 27.61 x 9.14 mm