Company Confidential
26
Raveon Technologies Corp.
Each
RV-M29
has a MYID programmed into it, and is represented as a 4 digit
decimal number.
RV-M29
IDs may be any number between 0001 and FFFF
[[[9999]]]. The Unit Address is programmed with the
MYID xxxx
command, and
the ID of the destination modem it sends its messages to (the Destination Address)
is configured with the
ATDT xxxx
command.
The factory default
MYID
in all
RV-M29
modem is 0001, and 0001 is also the
default for the Destination ID also. The ID of your particular
RV-M29
may have
been configured by your dealer or distributor. If so, it is labeled on the rear of the
unit. If it is not labeled with an ID, the factory default ID is in it.
The default Address Mask is F000, which means the
RV-M29
will receive a
transmission from any other RV-M29 as long as the first digit matches, in this case,
the first digit is a 0.
Make sure you set the
MYID
of each
RV-M29
in your system to a different
number.
For example, to set the ID of your
RV-M29
to 17, enter:
MYID 17 <enter>
To set your
RV-M29
to send its position and status data to
RV-M29
number 1,
enter:
ATDT 1 <enter>
To set your address mask to receive all messages from units with IDs 1-999, and
exclude 1000-9999, enter
ATMK F000 <enter>
Time Slots
The
RV-M29
uses a transmission scheme popular in mobile-telephones called
TDMA (Time Division Multiple Access). Each
RV-M29
is allocated a time-slot to
use for sending and receiving radio messages.
Refer to Section 8.2 for detailed explanation of the TDMA scheme. The important
point to understand is that for optimum efficiency in a
RV-M29
system, begin
sequentially numbering the MYID of the
RV-M29
transponders at ID 0001. The
second RV-M29 should be ID 0002, and so on.
The
RV-M29
transponders have internal clocks with 100 ticks-per-second. They
can measure time and initiate transmissions 100 times every second (every 10mS).
The TDMA time slot is configured to be some number of these ticks. The factory
default allocation is 100mS for one time-slot. So each TDMA time slot is 100mS
long, and thus in 1 seconds, up to 9
RV-M29
transponders may report position
using slots 1-9. Slot 0 is reserved.
7. Operation
Once power is applied to the RV-M29, the internal GPS will begin to try to lock onto
the GPS satellites.
