XLINK 500/100 Operations & Maintenance Manual page # 152
a. If the server does neither, the station will retry the transmission until it succeeds or until
it times out.
9. To acknowledge, the server needs to send a single byte: <cr>
a. Once the server sends the byte, the station will disconnect.
10. To initiate a command line session, the server sends user login command
!LOGIN=username,password<cr> and waits for the station to reply (ETX.)
a. If user login matches, the station enters command-line session.
b. Server issues pending commands, and the station processes and responds accordingly.
c. When command processing is complete, the server disconnects.
Session Type Code
Session type defines the processing that occurs on connection. Currently, there is only one
session type, 1. This type is defined by the Course of Events above, and details that follow.
Report Type Code
Report Type code describes the purpose of the transmission:
0 = self-timed
2 = entering alarm
4 = exiting alarm
6 = no data, command session only
15.12. Iridium Telemetry Header
When the station sends data over the Iridium satellite network, it uses the header described
below.
The header starts with a single byte in the ASCII printable range to make it easy to interpret the
content. Most transmissions will just have one header byte.
The header byte identifies the packet type in terms of the content of the packet, e.g., self-timed,
self-timed extended, entering alarm, entering alarm extended, etc.
Iridium modem buffers are limited in size. "Extended" types mean multiple packets are required
to transmit the entire message. Extended packets have information in the header that allows
them to be stitched together easily. The extended packet types include a comma-delimited sub-
header to describe the subset of data being sent. The first sub-header differs from all subsequent
sub-headers, in that it includes the total size of the data being sent.
The telemetry header may contain the station name if the setting Tx Station Name is enabled.
Please read below for more details.
15.12.1. Packet Structure
Packets are composed of
packet-type
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