DRAGINO DRA LMDS200 User guide

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 1 / 29

LMDS200 LoRaWAN Microwave Radar Sensor Manual

Document Version: 1.0.0

Image Version: v1.0

Version

Description

Date

1.0

Release

2021-Nov-25

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 2 / 29

1. Introduction .............................................................................................................................. 4

1.1 What is LMDS200 Microwave Radar Distance Sensor................................................................ 4

1.2 Features ...................................................................................................................................... 5

1.3 Radar probe specification ........................................................................................................... 5

1.4 Storage & Operation Temperature ............................................................................................. 5

1.5 Applications ................................................................................................................................ 5

1.6 Installation ................................................................................................................................. 6

1.7 Pin Definitions and Switch .......................................................................................................... 7

2. Operation Mode ....................................................................................................................... 8

2.1 How it works? ............................................................................................................................. 8

2.2 Example to use for LoRaWAN network ....................................................................................... 8

2.3 Uplink Payload .......................................................................................................................... 12

2.3.1 Device Status, FPORT=5 .................................................................................................. 12

2.3.2 Sensor Configuration, FPORT=4 ...................................................................................... 13

2.3.3 Distance, Uplink FPORT=2 ............................................................................................... 13

2.3.4 Decoder in TTN V3 .......................................................................................................... 15

2.4 Show data on Datacake ............................................................................................................ 16

3. Configure LMDS200 via AT Command or LoRaWAN Downlink ................................................. 20

3.1 Set Transmit Interval Time(0x01) ............................................................................................. 20

3.2 Set Alarm Transmit Interval Time(0x0D) .................................................................................. 21

3.3 Set Alarm Distance (0xA2) ........................................................................................................ 21

3.4 Enter/Exit Alarm Mode (0xA3) ................................................................................................. 22

3.5 Set Interrupt Mode (0x06) ........................................................................................................ 22

4. Battery & how to replace ........................................................................................................ 24

4.1 Battery Type ............................................................................................................................. 24

4.2 Replace Battery ........................................................................................................................ 24

4.3 Power Consumption Analyze .................................................................................................... 24

4.3.1 Battery Note ................................................................................................................... 25

4.3.2 Replace the battery......................................................................................................... 25

5. FAQ ......................................................................................................................................... 27

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 3 / 29

5.1 How to use AT Command to configure LMDS200 ..................................................................... 27

5.2 How to upgrade the firmware? ................................................................................................ 28

5.3 How to change the LoRa Frequency Bands/Region? ................................................................ 28

6. Trouble Shooting ..................................................................................................................... 28

7. Order Info ............................................................................................................................... 29

8. Packing Info ............................................................................................................................ 29

9. Support ................................................................................................................................... 29

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 4 / 29

1. Introduction

1.1 What is LMDS200 Microwave Radar Distance Sensor

The Dragino LMDS200 is a LoRaWAN Microwave Radar distance sensor. It uses 24Ghz Microwave
to detect the distance between sensor and different objects. Compare vs ultrasonic or Lidar
measurement method, Microwave Radar is more reliable for condensation / dusty environment.
It can sense correct distance even there is water or thick dust on top of the sensor.

The LMDS200 can be applied to scenarios such as horizontal distance measurement, parking
management system, object proximity and presence detection, intelligent trash can management
system, robot obstacle avoidance, automatic control, sewer, etc.

LMDS200 can measure two distances: the closest object and next object behind the closest one.

LMDS200 supports Alarm Feature, user can set the LMDS200 to uplink data in a short interval
when the distance is out of configured range.

The LoRa wireless technology used in LMDS200 allows device to send data and reach extremely
long ranges at low data-rates. It provides ultra-long range spread spectrum communication and
high interference immunity whilst minimizing current consumption.

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 5 / 29

LMDS200 is powered by 8500mAh Li-SOCI2 battery, it is designed for long term use up to 5 years.

Each LMDS200 is pre-load with a set of unique keys for LoRaWAN registrations, register these
keys to local LoRaWAN server and it will auto connect after power on.
*Battery life depends on how often to send data, please see battery analyzer.

1.2 Features

✓ LoRaWAN 1.0.3 Class A
✓ Ultra-low power consumption
✓ Microwave Radar for distance detection
✓ Short uplink interval for Distance Alarm
✓ Monitor Battery Level
✓ Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
✓ AT Commands to change parameters
✓ Uplink on periodically
✓ Downlink to change configure
✓ 8500mAh Battery for long term use
✓ Wall Mountable
✓ Outdoor Use

1.3 Radar probe specification

✓ Measuring Method: FMCW
✓ Frequency: 24.000 ~ 24.500 GHz
✓ Measurement output power: 6dBm
✓ Measure range: 0.5 ~ 20m
✓ Accuracy: ±0.1m
✓ Resolution: 0.01m
✓ Horizontal Angel: 78°
✓ Vertical Angel: 23°

1.4 Storage & Operation Temperature

-20°C to +85°C

1.5 Applications

 Horizontal distance measurement
 Liquid level measurement
 Parking management system

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 6 / 29

 Object proximity and presence detection
 Intelligent trash can management system
 Robot obstacle avoidance
 Automatic control
 Sewer
 Bottom water level monitoring

1.6 Installation

Sensor measure direction and angle is as below. When install the sensor, please make sure the
sensor direct to object.

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 7 / 29

1.7 Pin Definitions and Switch

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 8 / 29

2. Operation Mode

2.1 How it works?

Each LMDS200 is shipped with a worldwide unique set of OTAA keys. To use LMDS200 in a
LoRaWAN network, user needs to input the OTAA keys in the LoRaWAN network server. So
LMDS200 can join the LoRaWAN network and start to transmit sensor data.

2.2 Example to use for LoRaWAN network

This section shows an example of how to join the TTN V3 LoRaWAN IoT server. Usages with other
LoRaWAN IoT servers are similar.

✓ In this user case, the LMDS200 is installed on top of river to detect the water level and send

the level info to the LoRaWAN server. The LMDS200 will uplink different types of messages to
the LoRaWAN server. See Uplink payload for detail.

Assume the LoRaWAN Gateway DLOS8 is already set to connect to the TTN V3 network . We need
to add the LMDS200 device in TTN V3:

Step 1: Create a device in TTN V3 with the OTAA keys from LMDS200.
Each LMDS200 is shipped with a sticker with the default device EUI as below:

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 9 / 29

Users can enter these keys in the LoRaWAN Server portal. Below is the TTN V3 screenshot:
Add APP EUI in the application.

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 10 / 29

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 11 / 29

Add APP KEY and DEV EUI

Step 2: Power on LMDS200

Put the jumper to power on LMDS200 and it will auto-join to the TTN V3 network. After join
success, it will start to upload sensor data to TTN V3 and the user can see it in the panel.

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 12 / 29

2.3 Uplink Payload

Uplink payloads have two types:

➢ Distance Value: Use FPORT=2
➢ Other control commands: Use other FPORT fields.

The application server should parse the correct value based on FPORT settings.

2.3.1 Device Status, FPORT=5

Include device configure status. Once LMDS200 Joined the network, it will uplink this
message to the server.

Users can also use the downlink command (0x26 01) to ask LMDS200 to resend Device
Status.

➢ Sensor Model: For LMDS200, this value is 0x0C
➢ Firmware Version: 0x0100, Means: v1.0.0 version
➢ Frequency Band:

*0x01: EU868
*0x02: US915
*0x03: IN865
*0x04: AU915
*0x05: KZ865
*0x06: RU864
*0x07: AS923
*0x08: AS923-1
*0x09: AS923-2

Device Status (FPORT=5)

Size (bytes) 1 2 1 1

2

Value

Sensor Model

Firmware Version

Frequency Band

Sub-band

BAT

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 13 / 29

*0x0a: AS923-3
*0x0b: CN470
*0x0c: EU433
*0x0d: KR920
*0x0e: MA869

➢ Sub-Band:

✓ AU915 and US915:value 0x00 ~ 0x08
✓ CN470: value 0x0B ~ 0x0C
✓ Other Bands: Always 0x00

➢ Battery Info:

Check the battery voltage.
Ex1: 0x0B45 = 2885mV
Ex2: 0x0B49 = 2889mV

2.3.2 Sensor Configuration, FPORT=4

LMDS200 will only send this command after getting the downlink command (0x26 02) from
the server.

2.3.3 Distance, Uplink FPORT=2

LMDS200 will send this uplink after Device Status once join the LoRaWAN network successfully.
And LMDS200 will:

a) periodically send this uplink every 1 hour (TDC time), this interval can be changed.
b) periodically send this uplink every 1 minute in Alarm Mode.
c) send this uplink while there is interrupt event.

Uplink Payload totals 11 bytes.

Sensor Configuration FPORT=4

Size (bytes) 3 1 4 1

Value

TDC (unit: sec)

ATDC (unit: min)

Alarm Settings

Interrupt Settings

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 14 / 29

Object1 Distance:

Distance between sensor probe to the first object. (unit: mm)
For example, if the data you get from the register is 0x1B 0x05, the distance between the
sensor and the measured object is

1B05(H) = 6917 (D) = 6917 mm.

Notice: There are two special values for object 1 distance:

 0x0001: Probe not detected
 0x0002: Reading Invalid (exceed the valid range of the probe)

Object2 Distance:

Distance between sensor probe to the second object. (unit: mm)

DALARM Counter : Alarm Counter.

Distance Value, FPORT=2

Size (bytes) 2 2 2 1

Value

BAT

Object1 Distance

Object2 Distance

Status & Alarm

Status & Alarm field

Size (bit) 6 1

1

Value

DALARM Counter

Distance Alarm

0: Normal Value

1: Distance Alarm

Interrupt Alarm

0: No Alarm

1: external Interrupt Alarm

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 15 / 29

2.3.4 Decoder in TTN V3

Please check the decoder from this link:

https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LMDS200/pa
yload_decode/

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 16 / 29

2.4 Show data on Datacake

Datacake IoT platform provides a human-friendly interface to show the sensor data, once we
have sensor data in TTN V3, we can use Datacake to connect to TTN V3 and see the data in
Datacake. Below are the steps:

Step 1: Link TTNv3 to Datacake

https://docs.datacake.de/lorawan/lns/thethingsindustries#create-integration-on-tti

Step 2: Configure LMDS200 in Datacake

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 17 / 29

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 18 / 29

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 19 / 29

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 20 / 29

3. Configure LMDS200 via AT Command or LoRaWAN Downlink

Use can configure LMDS200 via AT Command or LoRaWAN Downlink.

➢ AT Command Connection: See FAQ.
➢ LoRaWAN Downlink instruction for different platforms:

http://wiki.dragino.com/index.php?title=Main_Page#Use_Note_for_Server

There are two kinds of commands to configure LMDS200, they are:

➢ General Commands.

These commands are to configure:

✓ General system settings like uplink interval.
✓ LoRaWAN protocol & radio related command.

They are the same for all Dragino Devices which support DLWS-005 LoRaWAN Stack(Note**).
These commands can be found on the wiki:

http://wiki.dragino.com/index.php?title=End_Device_Downlink_Command

➢ Commands special design for LMDS200

These commands are only valid for LMDS200, as below:

3.1 Set Transmit Interval Time(0x01)

Feature: Change LoRaWAN End Node Transmit Interval. Default Value: 3600000 = 1 hour

AT Command: AT+TDC

Command Example

Function

Response

AT+TDC?

Show current transmit Interval

30000
OK
the interval is 30000ms = 30s

AT+TDC=60000

Set Transmit Interval

OK
Set transmit interval to 60000ms =
60 seconds

Downlink Command: 0x01

Format: Command Code (0x01) followed by 3 bytes time value.
If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to
0x00003C=60(S), while type code is 01.

➢ Example 1: Downlink Payload: 0100001E // Set Transmit Interval (TDC) = 30 seconds
➢ Example 2: Downlink Payload: 0100003C // Set Transmit Interval (TDC) = 60 seconds

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 21 / 29

3.2 Set Alarm Transmit Interval Time(0x0D)

Feature: Change LoRaWAN End Node Alarm Transmit Interval. Default Value: 1 minute

AT Command: AT+ATDC

Command Example

Function

Response

AT+ATDC?

Show current alarm transmit
Interval

1
OK
the interval is 1 minute

AT+ATDC=1

Set Alarm Transmit Interval

OK
Set alarm transmit interval to 1
min

Downlink Command: 0x0D

Format: Command Code (0x0D) followed by 1 byte for time value.
If the downlink payload=0D02, it means set the END Node’s Alarm Transmit Interval to 2
minutes, while type code is 0D.

3.3 Set Alarm Distance (0xA2)

LMDS02 supports Alarm Feature, when LMDS02 detect the distance exceed the alarm settings,
LMDS02 will Enter Alarm Mode and use the ATDC interval (default is 1 minute) to uplink Distance
value. Alarm mode will last for 60 uplinks (default 1 hour) and can be close by downlink
command 0xA300.
Note: Alarm mode only valid for the Distance 1(the Closest Object)

User can set Alarm Distance to enable/disable Alarm Mode.

AT+ALARMC=AABBCCDD

 AABB: Hex value for Alarm low threshold, CCDD: Hex value for Alarm high threshold
 When 0xAABB=0, and 0xCCDD≠0, Alarm trigger when higher than max
 When 0xAABB≠0, and 0xCCDD =0xFFFF, Alarm trigger when lower than min
 When 0xAABB≠0 and 0xCCDD≠0, Alarm trigger when higher than max or lower

than min
Example:
AT+ALARMC=006400C8 // Alarm when < 100 or higher than 200.

➢ Downlink Payload:

0x(A2 00 01 00 00) // Same as AT+ALARMC=00010000

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 22 / 29

3.4 Enter/Exit Alarm Mode (0xA3)

Feature: Enter/Exit Alarm mode:

AT Command: AT+ALARM=0(Exit Alarm Mode or AT+ALARM=1 (Enter Alarm Mode)

Downlink Command:

0xA3 00 // Exit Alarm Mode.
0xA3 01 // Enter Alarm Mode. Enter Alarm mode will use ATDC interval in the next 59 uplinks.

3.5 Set Interrupt Mode (0x06)

Feature, Set Interrupt mode for Interrupt Pin.

AT Command: AT+INTMOD

Command Example

Function

Response

AT+INTMOD=?

Show current interrupt mode

0
OK
the mode is 0 = No interruption

AT+INTMOD=2

Set Transmit Interval
0- (Disable Interrupt),
1- (Trigger by rising and falling

edge),

2- (Trigger by falling edge)
3- (Trigger by rising edge)

OK

Downlink Command: 0x06

Format: Command Code (0x06) followed by 3 bytes.
This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge
trigger), and the type code is 06.

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 23 / 29

➢ Example 1: Downlink Payload: 06000000 // Turn off interrupt mode
➢ Example 2: Downlink Payload: 06000003 // Set the interrupt mode to rising edge

trigger

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 24 / 29

4. Battery & how to replace

4.1 Battery Type

LMDS200 is equipped with a 8500mAH ER26500 Li-SOCI2 battery. The battery is un-rechargeable
battery with low discharge rate targeting for 8~10 years use. This type of battery is commonly
used in IoT target for long-term running, such as water meter.

The discharge curve is not linear so can’t simply use percentage to show the battery level. Below
is the battery performance.

Minimum Working Voltage for the LMDS200:
LMDS200: 2.45v ~ 3.6v

4.2 Replace Battery

Any battery with range 2.45 ~ 3.6v can be a replacement. We recommend to use Li-SOCl2 Battery.
And make sure the positive and negative pins match.

4.3 Power Consumption Analyze

Dragino Battery powered product are all runs in Low Power mode. We have an update battery
calculator which base on the measurement of the real device. User can use this calculator to
check the battery life and calculate the battery life if want to use different transmit interval.

Instruction to use as below:

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 25 / 29

Step 1: Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from:

https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/Battery_Analyze/

Step 2: Open it and choose

➢ Product Model
➢ Uplink Interval
➢ Working Mode

And the Life expectation in difference case will be shown on the right.

The battery related documents as below:

● Battery Dimension,

● Lithium-Thionyl Chloride Battery datasheet, Tech Spec

● Lithium-ion Battery-Capacitor datasheet, Tech Spec

4.3.1 Battery Note

The Li-SICO battery is designed for small current / long period application. It is not good to
use a high current, short period transmit method. The recommended minimum period for
use of this battery is 5 minutes. If you use a shorter period time to transmit LoRa, then the
battery life may be decreased.

4.3.2 Replace the battery

You can change the battery in the LMDS200.The type of battery is not limited as long as the
output is between 3v to 3.6v.

JST-XH-2P

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 26 / 29

The default battery pack of LMDS200 includes a ER26500 plus super capacitor. If user can’t
find this pack locally, they can find ER26500 or equivalence, which will also work in most case.
The SPC can enlarge the battery life for high frequency use (update period below 5 minutes)

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 27 / 29

5. FAQ

5.1 How to use AT Command to configure LMDS200

LMDS200 UART connection photo

In the PC, you need to set the serial baud rate to 9600 to access the serial console for
LMDS200. LMDS200 will output system info once power on as below:

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 28 / 29

5.2 How to upgrade the firmware?

A new firmware might be available for:

✓ Support new features
✓ For bug fix
✓ Change LoRaWAN bands.

Instruction for how to upgrade:

https://wiki.dragino.com/index.php?title=Firmware_Upgrade_Instruction_for_STM32_base_pro
ducts#Hardware_Upgrade_Method_Support_List

Firmware location:

https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LMDS200/Firmware/

5.3 How to change the LoRa Frequency Bands/Region?

Users can follow the introduction for how to upgrade image. When downloading the images,
choose the required image file for download.

6. Trouble Shooting

www.dragino.com

LMDS200 LoRaWAN Microwave Radar Distance Sensor 29 / 29

7. Order Info

Part Number: LMDS200-XX

XX: The default frequency band

✓ AS923: LoRaWAN AS923 band
✓ AU915: LoRaWAN AU915 band
✓ EU433: LoRaWAN EU433 band
✓ EU868: LoRaWAN EU868 band
✓ KR920: LoRaWAN KR920 band
✓ US915: LoRaWAN US915 band
✓ IN865: LoRaWAN IN865 band
✓ CN470: LoRaWAN CN470 band

8. Packing Info

Package Includes:

✓ LMDS200 Microwave Radar Sensor x 1

9. Support

➢ Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different

timezones we cannot offer live support. However, your questions will be answered as soon
as possible in the before-mentioned schedule.

➢ Provide as much information as possible regarding your inquiry (product models, accurately

describe your problem and steps to replicate it etc) and send a mail to

[e-mail]