User's Manual

Document : WCAMODHEL.sxw
This index is also used to check that no frame was lost by ensuring that this value is well
decreased with each received frame.
5.4.5 - Format of the commands – from the request receiver side
➢ Reception of a broadcast request – 0x38 (RECEIVED_BROADCAST_FRAME)
RECEIVED_BROADCAST_FRAME
HEADER CMD D ATA CRC ETX
3 bytes 1 byte 6 bytes variable 2 bytes 1 byte
0xFF ; 0x02 ;
0xXX
0x38
Radio address of the
transmitter of the request
n bytes of data
the maximum size is 152
bytes
0x03
➢ Transmission of the response to a broadcast request – 0x24
(REQ_SEND_BROADCAST_RESPONSE)
REQ_SEND_BROADCA ST_RESPONSE
HEADER CMD D ATA CRC ETX
3 bytes 1 byte 6 bytes variable 2 bytes 1 byte
0xFF ; 0x02 ;
0xXX
0x24
Radio address of the
transmitter of the request
n bytes of data to transmit
the maximum size is 152
bytes
0x03
Remark : This command can only be used after the reception of a broadcast frame
(RECEIVED_BROADCAST_FRAME = 0x38). So, destination radio address of this message could
only be this from the emitter of the Broadcast frame.
Use of this command in any other circumpstances could make the Wavecard not available during a
few seconds.
➢ Status Message – 0x37 (END_MESSAGE_EXCHANGE)
END_MES SAGE_EXCHANGE
HEADER CMD D ATA CRC ETX
3 bytes 1 byte 1 byte 2 bytes 1 byte
0xFF ; 0x02 ;
0xXX
0x37 0x00 0x03
Attention, use of this command depends on the activation of status message, in parameter
EXCHANGE_STATUS (0x0E).
5.4.6 - Use of the selective, or not-selective broadcast mode
To initiate a Broadcast request, either in selective or not-selective mode, there is no particular procedure. The
user just has to ensure that the distant modules have their GROUP_NUMBER parameter configured.
WCAMODHEL Handbook page 64 of 74