User's Manual

RV-M50-EC Technical Manual
14
location of a RADAR target. A plotter or display connected
to the modem that supports the TLL message should put an
icon on its screen at the location specified. The icon name
is the MYID of the modem that transmitted its position over
the air.
$GPGGA
NMEA GPS Position Fix Data. This message is the standard
position message from a GPS receiver.
NMEAOUT 1
$GPGSV
NMEA Satellites in view. This message is the standard
message to indicate the number of satellites in view, and
their signal quality.
NMEAOUT 1
3.7 Device Addressing
ID Addressing Basics
ID addressing is used to differentiate one modem from another. Each must have a unique number
programmed into them, so that when a position report is received, the modem that sent the message
can be identified. This is called the MYID of the unit that sent the message.
Each modem has a MYID programmed into it, and is represented as a 4 digit hexadecimal number.
Addresses between 0001-FFFF are valid. 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 modems is 1234, and 1234 is also the default for the Destination ID also.
The default Address Mask is F000, which means the modem will receive a transmission from any other
modem as long as the first digit of the destination address matches, in this case, is a 1.
Make sure you set the MYID of each modem in your system to a different number.
For example, to set the ID of your modem to 17, enter:
MYID 17 <enter>
To set your modem to send its position and status data to modem 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>