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SF10
Laser altimeter
4. Menu options
The SF10 can be connected through the on-board USB port to a Terminal emulation program running on a PC. The LightWare Terminal
software is available for download from www.lightware.co.za.
Once the USB connection is made, the Terminal window displays the distance reading from the SF10. Pressing the <SPACE> key stops
the measuring process and changes the display to a menu that lists all the available settings and configuration options. Pressing the
<SPACE> key again restarts the measuring process. If no changes are made, the unit will automatically begin to measure again after
two minutes.
a: Zero datum offset (-10.00 m ... +10.00 m)
The point from which altitude measurements are taken can be adjusted using menu item <a>. The range of values that can be
entered are from -10.00 meter to +10.00 meters and this value is subtracted from the altitude reading before it is made available on
any of the interfaces. The zero datum offset can be used to compensate for the mounting position of the SF10 in the airframe, where
distance readings may best be interpreted from a suitable point on the landing gear, rather than from the front face of the SF10.
b: Smooth output - Switches ON / OFF a data filter which smoothes the outputs
Menu item <b> is used to reduce the effects of scrub, bushes and long grass on the mean altitude reading. Note that this filter
changes the time constant of the altitude measurements and therefore the rate of response.
c: Serial port baud rate (9600 ... 115200)
The serial port transmits a serial string of ASCII encoded data from the SF10 to the host controller. The baud rate of transmission is
selected by menu item <c> and toggles through the standard baud rates from 9600 to 115200. By default, there is 1 stop bit and no
parity or handshaking on this serial port.
The ASCII string representing the altitude is in floating point format with two decimal places followed by carriage return and line
feed:
where carriage return and line feed are given by the hexadecimal ASCII characters:
The altitude is sent out of the serial port when any ASCII character is transmitted by the host controller to the SF10.
SF10 Laser Altimeter - Product Manual - Revision 11
Product manual
Figure 9 :: LightWare Terminal showing menu options
"22.48\r\n"
\r = 0x0D
\n = 0x0A
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© LightWare Optoelectronics (Pty) Ltd, 2016
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