Coronis WaveCard 25mW, User Manual

Page: 44 / 67

Document : CS-SUP-MUTI-WPORTAPP-E02.sxw
The format of the types of frame received by the host, are described as follow.
➢ Request in 'Message' mode
REQ_SEND_MESSAGE
HEADER CMD DATA CRC ETX
3 bytes 1 byte 6 bytes variable 2 bytes 1 byte
0xFF ; 0x02 ; 0xXX 0x22
Radio address from
equipment to reach
n bytes of data to transmit
the maximum size ( N bytes) is defined below
0x03
Remark : maximum size definition
- Point to Point mode
:
Max = 152 bytes of data
- Relaying mode : Max = 152 – (2 + 6 x Number of repeaters)
=> 1 repeater : 144 bytes of data,
=> 2 repeaters : 138 bytes of data ,
=> 3 repeaters : 132 bytes of data .
➢ Acknowledgement of the request
RES_SEND_FRAME
HEADER CMD DATA CRC ETX
3 bytes 1 byte 1 byte 2 bytes 1 byte
0xFF ; 0x02 ; 0x05
0x21
Status
0x00 : transmission OK
0x01 : transmission error
0x03
➢ Status frame – 0x37 (END_MESSAGE_EXCHANGE)
END_MESSAGE_EXCHANGE
HEADER CMD DATA CRC ETX
3 bytes 1 byte 1 byte 2 bytes 1 byte
0xFF ; 0x02 ; 0xXX
0x37
0x00 0x03
Attention, the reception by the host of this command depends on the activation of status frame in
parameter EXCHANGE_STATUS (0x0E).
This command is useful while trying to exchange datas using 0x22 (
REQ_SEND_MESSAGE
), 0x24
(
REQ_SEND_BROADCAST_RESPONSE
) and 0x2A (
REQ_SEND_BCST_MESSAGE
) commands, since it gives
Wavecard Radio Board availibility for next RS232 serial link exchange (see diagram,p.46).
WaveCard user handbook page 44 of 67