XTR-8LR10
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User manual
Le caratteristiche tecniche possono subire variazioni senza preavviso. AUR°EL S.p.A. non si assume la responsabilità di danni causati dall’uso improprio del dispositivo.
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Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: +39.0546.941124 Fax: +39.0546.941660
Pag 6di 21
CR: coding rate from 1 to 4 (register S6)
EQ3
Tpachet: Total duration of the packet in seconds
12,25: number of symbols used by the preamble
On the following Link:
TBD
It is downloadable an Excel sheet that automatically calculates the radio flight time according to the
parameters chosen.
Data packet frame:
XTR-8LR10 is a radiomodem working in packet mode and handling addresses for point-to-multipoint
networks.
Packet has a 255 bytes max length, where 247 bytes are the payload and 8 the addresses.
It's made up of:
•Preamble: it comprises 8 bytes of variable length depending on data rate, used for synchronization
purposes.
•Header: it includes payload length in byte, Code Rate, presence of 16 bit CRC.
•Network_ID: every module has got a 4 bytes network ID, changeable via AT command. (present
only in network mode S10=1)
•Source Address: node or module address from which the packet starts (sender), composed by 2 bytes
for a total of 65536 nodes in each network. This address can be changed via AT command. (present
only in network mode S10=1)
•Destination Address: composed by 2 bytes, it means destination node address where sending the
message (payload). Differently from the other parameters, it is not changeable via AT command but
it must be forwarded on serial port, before payload.
0xFF (default) address means a broadcasting message: in this case every node joining the network
(same network_ID) receives the message (present only in network mode S10=1)
•Payload: from 1 to 247 bytes, composed by the sent or received message. When received, the
message is forwarded to UART output only in case Network_ID and Destination address are
corresponding to the parameters previously memorized in S11 and S12 registers, otherwise it's
eliminated. In case of transmission, data coming from UART port are included in payload field of
the radio packet transmitted.
•Payload CRC: 2 Bytes
In normal transmission and reception operations, it is mandatory to set up the 2 addresses needed for network
functionality in command mode, then move to NORMAL mode and send/receive data (payload). To transmit
a radio message the user must send to UART the Destination Address before the payload. In case of
reception of radio message, the data forwarded over the TX_UART would have on the beginning 2 Bytes of
Source Address. Data are not encryped.
TsymbNbPayloadsymTpachet ×+= 25,12
