Wavecard-Waveport User Manual
Coronis Systems
2. RS232 SERIAL PROTOCOL PRESENTATION
This protocol is dedicated to an asynchronous RS232 or TTL link between the host and the radio board. The
transmission format is:
•
8 data bits
•
1 stop bit
•
No parity
•
Speed: 9600 baud (please contact us if your application requires other speeds)
2.1 Basic data exchange
In most cases, the host module initiates data exchange, but either the host or the radio board can do it.
Figure 2 – Overview of data exchange between a Waveport modem and host
2.1.1 Low-level acknowledgement
Serial frames exchanged between a host and radio board are always managed by an acknowledge
mechanism.
In order to take processing time into account on the radio board, a minimum latency time of 1 ms must be
respected between frame reception and transmission of the corresponding acknowledgement.
If the
Acknowledge
frame is not received by the initiator, it can decide to re-send the frame several times
(
retry
mechanism). The default setting for this is:
Time-out = 500 ms
retry count = 3
CS-SUP-MUTI-WPORTAPP-E04
8
