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5. Configuring the ATLAS PL
5.1.
Overview
The RS232 serial port on the unit is used to send and receive data over the air, as
well as to configure the RF modem. In normal operation, the user sends serial data
into the TxD pin of the user port, and this data is transmitted over the air. Received
data from another RF modem is output to the user via the RxD pin of the user port.
This is the default operating condition of the RF modem. No special characters,
hardware control lines, or timing is required to operate the RV-M7 modem.
If the ATLAS PL is configured as a Personal Locator (GPS 8 mode), the serial port
need not be connected to anything. The internal GPS will initiate the transmissions
of position and status.
There is also a "Command Mode" used to program and configure the ATLAS PL.
In the Command Mode, the ATLAS PL modem accepts commands via the serial
port TxD pin. The commands can be used to change certain internal parameters of
the ATLAS PL modem as well as to read-out the current configuration and
diagnostic statistics.
5.2.
Command Mode
The ATLAS PL modem may be put into a "Command Mode", by entering a
sequence of three plus characters (+++). To keep the RV-M7 modem from
unintentionally entering the Command Mode because of the +++ pattern occurring
in a stream of data entering the modem, there must be a pause in the data stream
before the +++ as well as a pause after the +++ is sent. If either pause is missing,
the modem will not enter the command mode.
Company Confidential
16
Raveon Technologies Corp.
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