Networking methods Make a unicast transmission
XBee®/XBee-PRO SX RF Module User Guide
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n Use the SH and SLcommands to read this address.
n The form of the address is: 0x0013A2XXXXXXXXXX.
n The first six digits are the Digi Organizationally Unique Identifier (OUI).
n The broadcast address is 0x000000000000FFFF.
Make a unicast transmission
To transmit to a specific device in Transparent operating mode:
n Set DH:DL to the SH:SL of the destination device.
To transmit to a specific device in API operating mode:
n In the 64-bit destination address of the API frame, enter the SH:SL address of the destination
device.
Make a broadcast transmission
To transmit to all devices in Transparent operating mode:
n Set DH:DL to 0x000000000000FFFF.
To transmit to all devices in API operating mode:
n Set the 64-bit destination address to 0x000000000000FFFF.
The scope of the broadcast changes based on the delivery method you choose.
Delivery methods
The TO (Transmit Options) command sets the default delivery method that the device uses when in
Transparent mode. In API mode, the TxOptions field of the API frame overrides the TO command, if
non-zero.
The XBee/XBee-PRO SX RF Module supports three delivery methods:
n Point-to-multipoint (TO = 0x40).
n Repeater (directed broadcast) (TO = 0x80).
n DigiMesh (TO = 0xC0).
Point to Point / Point to Multipoint (P2MP)
This delivery method does not use a network header, only the MAC header.
In P2MP, the sending devices always send all messages directly to the destination. Other nodes do not
repeat the packet. The sending device only delivers a P2MP unicast directly to the destination device,
which must be in range of the sending device.
The XBee/XBee-PRO SX RF Module uses patented technology that allows the destination device to
receive unicast transmissions directed to it, even when there is a large amount of traffic. This works
best if you keep broadcast transmissions to a minimum.
A sending node repeats a P2MP broadcast transmission MT+1 times, but the receiving nodes do not
repeat it, so like a unicast transmission, the receiving device must be in range.
All devices that receive a P2MP broadcast transmission output the data through the serial port.
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