Company Confidential
22
Raveon Technologies Corp.
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Figure 3 (Streaming Mode of Operation)
For operation of the modem in the Packetized Mode, see the section on page 11
entitled Using the Radio Modem – Packet Mode
.
10.2 Baud Rate Selection
In Streaming Mode, the user data may still enter the modem at any baud rate, as
set with the
ATBD x
command. The modem will buffer the data and send it out
over the air in the same order as it enters the modem. When the buffer is empty
and there is no more data coming into the modem, it will automatically de-key the
radio and go back into the receive mode. The modem will send a hidden end-of-
message signal to the receiving modem, thus avoiding any extra data bytes
“
dribble bytes
” from coming out of the user serial port. When the modem is
operating with very weak signals, the end-of-message signal may be obscured,
and missed by the receiving Modem. In this case, additional noise bytes may
come out of the user serial port.
While receiving, the modem will also output the receive data out the serial port at
the rate set by the
ATBD
command. If the serial port baud-rate is slower than
the over-the-air rate, an internal buffer in the modem will hold the data as it is
sent out the serial port.
