Laser Distance Module
Laser Distance Sensor

FST-20A Small Size Laser Distanc...

Measuring range: 0.15 to 30m Accuracy: Typically: ±1.5mm Measurement time: 0.2s Laser class: Class II 635nm, <1mW Output mode: RS232/485 ,4-20M Size: 65x55x25mm Measuring mode: trigger measuring continuous measuring Power Supply: DC 5V/1A or 24V/1A Power consumption: <3W
Tel:(+86) 029-85426859      Tel:(+86) 029-85426859

Description

Specification

Packing list

Datasheet download



Applications: 
1. Road traffic 
2. Automotive anti-collision 
3. Construction survey and design 
4. Levelmaterial level detection 
5. Robot arm control 
6. Fixed length control of container crane spreader 
7. Security monitoring 
8. Military applications 



Using instructions

 

1 Cable connecting definitions


Red line         ——       +5V

Black line       ——       PGND

Yellow line     ——       T/R-

Green line      ——       T/R+

Blue line        ——       DGND

 

       2 Operating Steps

 

       2.1 Connect a sensor to the serial port of computer (or other device which have serial ports) and the power port of adapter with special data cable.

 

              2.2 Trigger Measuring

                     2.2.1 Send the command “O” (ASCII) or “0X4F” (HEX) by computer to turn on the sensor. Then the sensor will turn on the laser and prepare for working, and return the data “FF 00 0A 0A 0A 00” to the serial interface.

                     2.2.2 Send the command “O” (ASCII) or “0X4F” (HEX) again to the sensor to start to measure distance. The sensor will return the measured data like “FF XX XX XX XX XX” to the serial interface and turn off the laser when it finished one time measurement.

                     2.2.3 Send the command “U” (ASCII) or “0X55” (HEX) to turn off the sensor.

 

              2.3 Continuous Measuring

                     2.3.1 Send the command “O” (ASCII) or “0X4F” (HEX) by computer to turn on the sensor. Then the sensor will turn on the laser and prepare for working, and return the data “FF 00 0A 0A 0A 00” to the serial interface

                     2.3.2 Send the command “C” (ASCII) or “0X43” (HEX) to the sensor. The sensor will begin to measure continuously after 3 seconds when it got the order, and return the data continuously like “FF XX XX XX XX XX”. If the sensor couldn’t get any available data, it will return “FF 00 0A 0A 0A 00” to the serial interface.

                     2.3.3 Send the command “U” (ASCII) or “0X55” (HEX) to turn off the whole sensor (include both of laser unit and measuring unit).

 

 Input and output

 

       1 Data format for RS232 serial communication

       Baud rate: 9600 bps , Data bits: 8 , Stop bit: 1 , Parity bit: None

 

       2 RS232 input frame format

There is only one byte in every input frame. The user could send different commands to the sensor for different purpose, the functions of command are shown in the following table.

 

HEX

0X4F

0X43

0X55

ASCII(Capital letter)

O

C

U

Functions of command

Power On &

Trigger Measuring

Continuous Measuring

Power Off

 

3 RS232 output frame format

There is 6 bytes in every output frame, the frame header is 0XFF, MSB is A, LSB is E. Their orders are shown in this table here.

 

0XFF

A

B

C

D

E

A     B     C    D     E   



HEX

0x30

0x31

0x32

0x33

0x34

0x35

0x36

0x37

0x38

0x39

0x2d

0x20

0x00

0X45

ASCII

0

1

2

3

4

5

6

7

8

9

-

space

 

E

The mapping table of HEX and ASCII codes:

 

 Display Notices

 

All display notices are either displayed with “E XXX”. The following errors can be corrected.

Display Notice

Cause

Correction

E 204

Calculation error

Repeat procedure

E 252

Temperature too high

Let device cool down

E 253

Temperature too low

Warm device up

E 255

Received signal too weak, time for a measurement too long.

Use a target plate

E 256

Received signal too strong

Use target plate(gray side)

E 257

Faulty measurement, too much background light

Use target plate(brown side)

E 258

Outside of the range of measurement

Select measurement distance within the range of measurement



FST-20 Laser Distance Sensor Technical Data

 

Laser Distance Sensor

FST-20D(232)

FST-20D(485)

FST-20A

FST-20K

Measuring Range

0.2m to 20m*

0.2m to 20m*

0.2m to 20m*

0.2m to 20m*

Measurement rate ( Up to )

5Hz

Measuring accuracy

±1mm**

±1mm**

±1mm**

±1mm**

Smallest unit displayed

1mm

1mm

N/A

N/A

Laser type

635nm,1mW

635nm,1mW

635nm,1mW

635nm,1mW

Laser beam diameter approx.

-at 10m distance

-at 50m distance

 

6mm

30mm

 

6mm

30mm

 

6mm

30mm

 

6mm

30mm

Measurement time

20-100ms

Measuring mode

-trigger measuring

-continuous measuring

 

yes

yes

 

yes

yes

 

yes

yes

 

yes

yes

Operation mode

commands by computer

commands by computer

commands by computer

commands by computer

Output mode

Digital output:

RS232 serial output

Digital output:

RS485 serial output

Analog output:

4-20mA current output

Switch output:

2 ways switch output

Power supply

DC 5V/1A

DC 5V/1A

DC 24V/1A

DC 5V/1A

Power consumption

3W

3W

3W

3W

Storage Temperature

-25 to 70

-25 to 70

-25 to 70

-25 to 70

Operating Temperature

0 to 40

0 to 40

0 to 40

0 to 40

Dimension

65 x 55 x 25 mm

65 x 55 x 25 mm

65 x 55 x 25 mm

65 x 55 x 25 mm

Housing material

aluminium alloy

Protection class

IP67

Safety class

II

Certifications

CE,FDA

Standards applied

IEC 60947-5-2

Weight

70g

70g

70g

70g

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