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SF02/F
SF02/F
Laser rangefinder
Product manual
Auxiliary serial port
The auxiliary serial port on the “TXD” and “RXD” screw terminals transmits an ASCII encoded string as a floating point representation
of the distance measured. The serial port uses 0 V / 3.3 V logic and is designed for direct connection to a similar serial port on the
host controller. The baud rate is selectable using the menu system.
Figure 10 :: Serial interface, Auxiliary serial port basic connection
The time when distance data is transmitted from the auxiliary serial port is controlled by one of two triggers. The first is a software
trigger provided by the host controller through its serial port and consists of the ASCII code for the letter <D>. When the SF02/F
receives this character it outputs the next available distance result which will happen in less than 30 ms.
There is an alternative hardware trigger on the “Trigger” screw terminal that can be controlled by a digital port pin on the host
controller. This trigger must be a negative going pulse, and must return to 3.3 V before the next result is transmitted from the
auxiliary serial port.
Figure 11 :: Serial interface, auxiliary serial port with hardware trigger
SF02/F Laser Rangefinder - Product Manual - Revision 10
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© LightWare Optoelectronics (Pty) Ltd, 2016
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