XLINK 500/100 Operations & Maintenance Manual page # 125
If
Listening
is disabled, the system checks for messages when it makes a transmission. If the
station is set up with a
Tx Interval
of 15 minutes, it may take up to 15 minutes for the station to
receive the message sent to it. With
Listening
disabled, the station turns off the modem between
transmissions to save power.
Additionally, the station can be setup to do periodic message checking. No matter how it is
setup, the station will do a message check every 24 hours. Please see the Iridium Setup section
for more on Listening and message checking.
When the station is turned on, it keeps the Iridium modem on for ten minutes. During that time,
it will receive messages immediately. When it does receive a message, the station will keep the
modem turned on for ten additional minutes to facilitate additional message conversations.
Messages are treated like command line input with a few differences. Some commands cannot
be executed via a message (e.g. log download). Other commands may have a differently
formatted output (in order to reduce message size).
Do not forget to precede the commands with an exclamation point if you want
the station to reply.
To check the status of your station, send it the message
!STATUS
Password protected stations will need login information to be the very first thing in a message:
LOGIN=XXX; !STATUS
The system remembers the last message received since boot up. To see it, press the Radio Diags
button on LinkComm's Telemetry tab or issue the STATUS TX command.
Email is used to send messages to the station via Iridium.
The email message must be sent to Data@SBD.Iridium.com
The email's subject must be the IMEI of the Iridium modem. The IMEI may be seen by
pressing the Radio Diags window of LinkComm’s
Telemetry tab. Each transmission made by
the station over Iridium will be stamped with its unique IMEI.
The email needs an attachment containing the command(s) to be sent. The attachment is a
simple text file, and it must have the .sbd extension. Example file names: Status.sbd,
MultiCmd.sbd
The body of the email should be blank. Do not put commands for the station into the body
of the email.
The attachment may not be larger than 270 bytes.
Each command may be replied with no more than two messages, for a total of 680 bytes.
The first byte of this file must be an ! in order for the station to send a reply. E.g.
!STATUS
Multiple commands may be sent in a single message. Commands can be separated with a
new line or a semicolon ; E.g.
!LAST; !STATUS;
