Manual
LW20 / SF20 LiDAR sensor
Product manual
Revision history
Version
Date
Author
Comments
Rev 9
2018/07/23
TLP
Included “Figure 30 :: Heat sink contact area” (page 22).
Rev 8
2018/07/04
TLP
Removed feature “Remove feature: “Encoded laser pulses prevent interference for
other lasers” (pages 1, 6). Removed feature “Power saving mode to save energy when
not in use” (page 1). Updated power supply current to “130 mA” (pages 5, 7). Added
“Objects must be separated by approximately 5 meters before they are seen as
separate return signals.” (page 6). Include cautionary note “The SF20 is an OEM module
that requires the customer to provide appropriate heat sinking and EMI shielding” (page
7). Changed “Select the “Laser” icon” to “Select the “Settings” icon” (page 8). Added
new instruction "Press the up arrow to engage serial communication mode. The LW20
will reply with a product code” (page 11). Removed <~> key option to go back into
machine-to-machine mode (page 11). Updated “Figure 12 :: Arrangement of screens in
terminal emulation mode” (page 11). Update "The LW20 will wait for the first command
to confirm which communication mode to select (serial or I2C). The first command will
not get a response (page 15). Remove the “E - The Energy channel controls power
usage” channel (pages 15, 24, 26). Remove the setting “Encoding pattern” from the
table (page 16). Correct the serial port baud rate to “9600 … 921600” (page 16).
Updated “Figure 31 :: Pinout diagram” (page 23). Added note “The first command sent
after power up will be used to detect if the LW20 is running in Serial or I2C mode, and
therefore will not get a response” (page 24). Replace “%C - Save the latest
communications settings to permanent memory" with “%P - Save all settings to
permanent memory” (page 24). Updated “Command list” table (pages 24, 25, 26).
Rev 7
2018/04/26
TLP
Added new model variations for “LW20/B”, “LW20/C”, “SF20/B” and “SF20/C” to
replace obsolete “LW20/SER”, “LW20/I2C” and “SF20” models (pages 2, 7, 15). Units
now ship a single I2C and serial communication cable (pages 7, 15, 17, 24). Updated
“Figure 10 :: Connection to a USB converter cable” (page 11). Updated “Figure 4 ::
Connection to a USB converter cable” (page 8) and “Figure 13 :: Connection to a
Devantech USB-ISS module” (page 13). Removed sentences “5 V logic should also work
without any level shifters.” and “In some cases, 5 V logic will also work but this is not
guaranteed.” (page 15). Included cautionary note “Ensure that adequate ventilation or
heat sinking is provided if the SF20 is incorporated into a custom enclosure, as heat
build-up could occur.” (page 22). Removed “Figure 31 :: I2C and power cable”. Updated
“Figure 31 :: Pinout diagram” by removing reference to “or 5 V logic” on RXD pin (page
22).
Rev 6
2018/04/05
TLP
Updated “4. Specifications of the LW20 / SF20” item “Range” to “0.2 … 100 m (sunlit
white wall, 45 readings per second)” (pages 4, 5). “4. Specifications of the LW20 /
SF20” item “Beam divergence” to “0.3°” (page 5). Updated “Figure 13 :: Connection to
a Devantech USB-ISS module” to reflect an LW20/I2C model (page 11).
Rev 5
2017/07/27
TLP
Added “Figure 32 :: Pinout diagram (page 22).
Rev 4
2017/05/25
TLP
Highlighted the factory default I2C bus address as 0x66 (pages 12, 14). Highlighted the
factory default serial baud rate as 115200 (page 12).
Rev 3
2017/05/05
TLP
Changed baud rate setting from 921600 to 115200 (pages 6, 9). Updated “Figure 13 ::
Connection to a Devantech USB-ISS module” (page 11). Updated LightWare Terminal
screens to version 1.3.1 (pages 6, 9, 10, 11, 14). Included “Data streaming” section into
“Appendix C” (page 25).
Rev 2
2017/04/10
TLP
Include new section “6.1 How to communicate with the LW20 using the Devantech USB
to I2C module” (pages 11, 12).
Rev 1
2017/03/03
JEP
Updated “4. Specifications of the LW20 / SF20” to include the approval “FDA:
1710193-000 (2017/02)” (page 5). Update “Figure 26 :: Serial and power cable” (Rev 2)
and “Figure 27 :: I2C and power cable” (Rev 2) to include a Ferrite Core component
(page 19).
Rev 0
2017/02/20
JEP
First edition
LW20 / SF20 LiDAR - Product manual - Revision 9 | of | © LightWare Optoelectronics (Pty) Ltd, 2018 | www.lightware.co.za 28 28