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SF10
Laser altimeter
Product manual
Analog voltage interface
The analog interface on the main connector produces a linear voltage of between 0.00 V and 2.56 V that is proportional to the
measured altitude. The physical altitude in meters that equates to 2.56 V can be adjusted through the USB menu system. For
example, an altitude setting of 51.20 meters would produce a linear voltage output of 50 mV per meter.
Figure 6 :: Analog voltage connections
Serial interface
The serial interface on the main connector outputs the measured altitude in meters as an ASCII encoded number. This interface uses
3.3 V logic levels and can be connected directly to any similar, compatible interface. Distances are transmitted whenever the SF10
receives an ASCII character from the host controller. This character may have any value in the extended ASCII character set. The
baud rate for the serial interface is selectable through the USB menu system. The maximum delay between receiving a character and
returning the altitude is 25 ms.
Figure 7 :: Serial interface connections
I2C interface
The I2C interface on the main connector outputs a value that represents the altitude in centimetres. This interface operates in
"slave" mode and uses 3.3 V logic levels. The I2C address can be set through the USB menu system. The host controller acts as the
I2C "master" and sends the address to the SF10 as an 8 bit value (7 address bits plus 1 read bit). The SF10 then returns the altitude
as a 16 bit integer. The maximum delay between receiving the address and returning the altitude is 25 ms.
Figure 8 :: I2C interface connections
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SF10 Laser Altimeter - Product Manual - Revision 11
© LightWare Optoelectronics (Pty) Ltd, 2016
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