XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 34
Broadcast
To transmit to all radios:
• For transparent mode set DH:DL to 0x000000000000FFFF, and for API mode set the 64-bit desti-
nation address to 0x000000000000FFFF.
• The scope of the broadcast changes based on the delivery method chosen.
Delivery Method
There are three delivery methods supported by this radio:
• Point to multipoint. (0x40)
• Repeater (Directed broadcast). (0x80)
•DigiMesh. (0xC0)
The TO parameter is the default delivery method used by transparent mode. For API transmissions the
TxOptions API field is used to specify the delivery method. When the TxOptions API field is set to 0, the
value in the TO parameter will also be used by API transmissions.
The three delivery modes are described below:
Point to Point/Multipoint (P2MP)
This delivery mode does not use a network header, only the MAC header. All messages are always sent directly to the
destination. There is no repeating of the packet by other nodes.
A P2MP unicast is only delivered directly to the destination radio, which must be in range of the sending radio. This radio
uses patented technology that allows the destination radio to receive transmissions directed to it, even when there is a
large amount of traffic. This works best when broadcast transmissions are kept to a minimum. A P2MP broadcast
transmission is repeated MT+1 times by the sending node, but is not repeated by nodes which receive it, so like a
unicast transmission, the receiving radio must be in range. All radios that receive a P2MP broadcast transmission will
output the data through the serial port.
Throughput
10 kbps version, 115.2 kbps serial data rate
200 kbps version, 115.2 kbps serial data rate
Note: Data throughput measurements were made setting the serial interface rate to 115200 bps, and measuring the time
to send 100,000 bytes from source to destination. During the test, no route discoveries or failures occurred.
Repeater/Directed Broadcast
Related parameters: CE, NH, NN, BH
Directed broadcast transmissions will be received and repeated by all routers in the network. Because ACKs are not
used the originating node will send the broadcast multiple times. By default a broadcast transmission is sent four
times. Essentially the extra transmissions become automatic retries without acknowledgments. This will result in all
nodes repeating the transmission four times as well. Sending frequent broadcast transmissions can quickly reduce
the available network bandwidth and as such should be used sparingly.
Configuration Data Throughput
Point to point unicast, Encryption Disabled 8.8 kbps
Point to point unicast, Encryption Enabled 8.7 kbps
Configuration Data Throughput
Point to point unicast, Encryption Disabled 105.5 kbps
Point to point unicast, Encryption Enabled 105.4 kbps
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