3.4
CONNECTION OF THE SERIAL PORT WITH GSM MODEM
Optionally, the Tiltometer may be connected to a GSM Modem via the serial port. You can
use the serial connection through the modem for configuration or data acquisition.
Setting the ALARMANGLE parameter to a value less than 90, the alarm mechanism is
activated. When the Elevation angle becomes smaller than the ALARMANGLE, then an SMS
message to a preset number (ALARMPHONE) will be automatically send. Messages will be
sent every 24 hours, until the Elevation angle increases above the ALARMANGLE value. If the
alarm condition is removed before completion of the 24-hour interval, then an SMS will still
be sent. The first SMS will not be sent until the power-up time is 24 hours. The SMS contains
the following message:
"Elevation Angle is X degrees. Alarm Angle is Y degrees. Dangerous Tilt!!!
"
where X is the current elevation angle and Y is the preset ALARMANGLE. GSM modems from
Siemens and Wavecom have been tested and perform well with this function.
4
PLACEMENT POSITIONS & CORRESPONDING OUTPUTS
A general idea of the space in which the tiltometer can move and typical values of the
elevation and azimuth angle are given in figure 7 (E: elevation, A: azimuth). Please notice
that when Elevation is at 90 degrees, then the Azimuth cannot be determined; this is because
the projection of the Z-axis on the horizontal plane becomes zero.
E=90,
A= indeterminate
Positive Z-axis
Positive Y-axis
Positive X-axis
E=0,
A=90
E=0,
A=0
E=0,
A=180
E=0,
A=270
E=-90,
A=indeterminate
Figure 7
S-UME-TILT_1_0-004
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