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AT commands
MAC/PHY commands
The following AT commands are MAC/PHY commands.
CM (Channel Mask)
CM allows you to selectively enable or disable channels used for RF communication. This is useful to
avoid using frequencies that experience unacceptable levels of RF interference, or to operate two
networks of radios on separate frequencies.
This mask limits the channels where the device transmits. See
frequencies. Channel 0 is bit 0. You must enable at least two channels, except when using only a single
frequency of 869.85 MHz. When you use this mode (use 0x20000000), LBT+AFA is disabled and requires
the power level to be 5 mW e.r.p. or less.
This command is a bitfield.
The CM command does not limit receive channels. If two devices have mutually exclusive values for
CM (for example 0x0000FF00 and 0x000000FF), then communication is possible because both devices
still listen on all possible channels, while limiting the transmission channels to those specified in the
CM command.
Parameter range
0 - 0x3FFFFFFF [bitfield]
Default
Europe: 0x3FFFFFFF (channels 0 - 29, 863.15 - 869.85 MHz)
Europe (single frequency mode): 0x20000000 (channel 29, 869.85 MHz)
HP (Preamble ID)
The preamble ID for which the device communicates. Only devices with matching preamble IDs can
communicate with each other. Different preamble IDs minimize interference between multiple sets of
devices operating in the same vicinity. When receiving a packet, the device checks this before the
network ID, as it is encoded in the preamble, and the network ID is encoded in the MAC header.
Parameter range
0 - 9
Default
0
ID (Network ID)
Set or read the user network identifier.
Devices must have the same network identifier to communicate with each other.
When receiving a packet, the device check this after the preamble ID. If you are using Original
equipment manufacturer (OEM) network IDs, 0xFFFF uses the factory value.
During join via commissioner, ID determines the extended pan ID of the network to join.
Parameter range
0 - 0x7FFF
XBee 868LP RF Modules User Guide
MAC/PHY commands
Technical specifications
for the list of
127
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