XLR PRO serial addressing basics
XLR PRO Radio Frequency (RF) Modem User Guide
30
Unicast
To transmit to a specific radio:
•
For Ethernet RF bridging, set BA to the SH:SL of the destination radio. BA is the entire 64-bit address and is not
broken into two 32-bit values. For example: BA=0x0013A20012345678.
•
If you have configured Ethernet bridging for unicasts, up to three retries occur while waiting for an ACK. As a result,
unicasts are slower, but more reliable than broadcasts.
Broadcast
To transmit to all radios:
•
For Ethernet RF Bridging, set BA to 0x000000000000FFFF.
•
If more than two XLR PRO devices are participating in a bridge, then you must set BA to 0xFFFF.
•
By default, Ethernet bridging uses broadcasts and no retransmissions occur. If you send packets via TCP, then the
TCP protocol provides the retransmissions as needed to provide for reliability. UDP packets may be lost when BA is
set to a broadcast address.
XLR PRO serial addressing basics
Related parameters: SH, SL, DH, DL, TO
64-bit addresses
Each radio has a unique factory-assigned IEEE 64-bit address. Use the SH and SL commands to read the factory-
assigned address. This is the source address of the radio that sent a packet, which is returned in API mode. Addresses
use the following form: 0x0013A2XXXXXXXXXX. The first six digits are the Digi OUI. The broadcast address is
0x000000000000FFFF.
Unicast
To transmit to a specific radio:
•
When using transparent mode, set DH:DL to the SH:SL of the destination radio.
•
For API mode, set the SH:SL address in the 64-bit destination address field of the API frame.
Broadcast
To transmit to all radios:
•
For transparent mode, set DH:DL to 0x000000000000FFFF.
•
For API mode, set the 64-bit destination address field to 0x000000000000FFFF.
•
The scope of the broadcast changes based on the delivery method chosen.
Delivery method
This radio supports two delivery methods:
•
Point-to-multipoint (0x40).
•
Repeater (directed broadcast) (0x80).