www
.lightware.co.za • info@
lightware.co.za
SF02/F
SF02/F
Laser rangefinder
Product manual
Digital expansion port
The digital expansion port has an unpopulated, 0.1” pitch header that gives access to all the features available on the screw
terminals plus 2 additional alarms and an I2C bus.
Analog expansion port
A analog expansion port is available to advanced users who want to see the outgoing laser pulses and the return signal on an
oscilloscope or convert them into digital data using ADCs. This port has an unpopulated, 0.1” pitch header. Note that connections to
these port pins may affect the accuracy of the readings due to noise picked up from the connecting wires.
The signals on the analog port are on a much slower time-base than the actual laser pulses which travel at the speed of light. The
process of converting the fast signals into slower representations is called “sequential-equivalent-time-sampling” or SETS.
1
Voltage in
Unregulated power input, 6.5V .. 9.0V
2
Alarm 3
0 V / 3.3 V logic level alarm number 3
3
Ground
Ground
4
Alarm 2
0 V / 3.3 V logic level alarm number 2
5
+ 5 V
+5 V power input or output
6
Alarm 1
0 V / 3.3 V logic level alarm number 1
7
Do not connect
This pin must be left unconnected
8
Trigger
Trigger input
9
SCL
Clock line for I2C bus
10 Voltage out
Analog voltage output 0 V ... 3.3 V logic levels
11 SDA
Data line for I2C bus
12 TXD
Serial transmit using 0 V / 3.3 V logic levels
13 Ground
Ground
14 RXD
Serial receive using 0 V / 3.3 V logic levels
Figure 12 :: Digital expansion port
1
Signal
An inverted, analog image of the return signal. The
maximum amplitude is 2.6V with a period of 31.25 ms
1
Ground
Ground
3
Zero
An analog image of the outgoing laser pulse. The
maximum amplitude is 2.6V with a period of 31.25 ms
4
Ground
Ground
5
Timer-sync
A 32 Hz square-wave that can be used to trigger an
oscilloscope or synchronize ADC conversion cycles
6
Ground
Ground
7
ADC-sync
A 32 kHz square wave that can be used to trigger ADC
conversions
8
Ground
Ground
Figure 13 :: Analog expansion port
SF02/F Laser Rangefinder - Product Manual - Revision 10
of
© LightWare Optoelectronics (Pty) Ltd, 2016
9
17
