Document : CS-SUP-MUTI-WPORTAPP-E02.sxw
2. RS232 SERIAL PROTOCOL PRESENTATION
This protocol is dedicated to an asynchronous RS232 or TTL link between the host and the radio board.
➢
Transmission format :
8 bits data,
1 stop bit,
no parity
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Transmission speed : 9600 baud (contact us for other speed :
)
2.1- Exchanges principle
The host or the radio board can take the initiative of the exchange. Nevertheless in the high majority of the
cases, the host will take the initiative.
Fig. 1 – synoptic of the exchanges between a WavePort modem, and its host
2.1.1 - Low level acknowledge
In all the cases, the serial frames exchanged between the host and the radio board are managed by an
acknowledge mechanism.
A minimum latency time of
1 ms
must be respected between the frame reception and the corresponding
acknowledge emission in order to respect the radio board processing time after a frame reception.
If the Acknowledge frame is not received by the initiator, it can decide to re-send several times the frame
(retries mechanism). The RF default setting is :
Time-out = 500 ms
repetition number = 3
WaveCard user handbook
page 6 of 67
