LPMS-INC1 Hardware Manual

LPMS-INC1 Hardware Manual

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LPMS-INC1 is a high-precision, high-stability dual-axis inclinometer based on MEMS sensors. It offers a measurement range of ±90°, a resolution of less than 0.001°, and an accuracy of up to 0.011°. The operating temperature range is -20 to 85 °C. By integrating and processing data from its built-in accelerometer, and applying filtering and calibration algorithms, the device digitally outputs various data including raw acceleration, calibrated acceleration, tilt angles, and temperature.

Communication Options: To suit different applications, LPMS-INC1 provides four communication interfaces: RS232, CAN, RS485, or TTL.

Key Features:

  • High-precision, high-stability dual-axis inclinometer based on MEMS sensors

  • Measurement range: ±90°

  • Resolution: <0.001° (IEEE 32-bit single-precision floating-point format)

  • Accuracy: 0.011°

  • Operating temperature range: -20 to 85 °C

  • Supply voltage: 5 to 36 V

  • Real-time output: raw acceleration data, calibrated acceleration data, tilt angle data, temperature data, up to 500Hz output frequency

  • Communication interfaces: RS232, CAN, RS485, or TTL

Applications:

  • Construction machinery

  • Energy and power systems

  • Bridge and building structures

System Overview

System Architecture

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Pinout Description

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M12 A-coded 8 Pin Male connector
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M12 Data cable for LPMS-INC1

Pin

Type

Name

Function

Color

1

Power Supply

VIN

+5V~36V

White

2

GND

Ground

Brown

3

RS232/CAN/RS485/TTL
communications

232T/CAN_H/B/Tx

Sensor Transmit

Green

4

232R/CAN_L/A/Rx

Sensor Receive

Yellow

5

-

RES

Reserved

Gray

6

USB

D-

USB D-

Pink

7

D+

USB D+

Blue

8

-

EN

Sensor Enable
(Pull low to disable)

Red

Please note that TTL, RS232 and CAN Bus pins are mutually exclusive. Only one communication interface is enabled depending on the model. Communication interfaces for different LPMS-U3 models are listed below:

Model

Communication Interface

USB

RS232

CAN

RS485

TTL

LPMS-INC1-RS232

×

×

×

LPMS-INC1-CAN

×

×

×

LPMS-INC1-RS485

×

×

×

LPMS-INC1-TTL

×

×

×

△: Optional

Default settings for communication interface:

  • USB: USBXpress, convertible to virtual COM port,921600bps,8N1 

  • RS232, TTL: 921600bps,8N1

  • CAN: 500kbps, termination resistor: disabled by default (Can be enabled upon request).

  • RS485: 115200bps, 8N1

Reference System

Coordinates

The coordinate system for LPMS-INC1 is defined as follows:

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Accelerometer output convention

A positive acceleration output will be produced when the sensor is accelerated at the same direction of the positive axes. When the sensor is at rest with Z axis pointing upwards, the calibrated output of the accelerometer is expected to be [0 0 +1g] indicating the acceleration due to the force of gravity.

Euler output convention

Euler output is in degree. Euler X and Y represents angle between X/Y axis and horizontal. LPMS-INC1 does not output yaw angle.

Range of euler output is as follow:

  • X Angle: -90° ~ +90°

  • Y Angle: -90° ~ +90°

  • Z Angle: -

Specifications

Main Parameters

Parameter

Condition

Value

Units

Min.

Typ.

Max

Power supply

 

5

12

36

V

Current consumption

 

8

20

37

mA

Dimension

 

 

74 x 40 x 28.5

 

mm

Weight

 

 

~184

 

g

Measurement range

X Axis

 

±90

 

deg

Y Axis

 

±90

 

deg

Resolution

Float32 Output

 

<0.001

 

deg

Accuracy

RMS

 

0.011

 

deg

Power consumption

RS232

 

0.24

 

W

CAN

 

0.3

 

W

Output frequency

 

5

100

500

Hz

Operating temperature

 

-20

25

85

°C

Output data type

Raw and calibrated accelerometer data / Euler angle / Temperature

Connector

M12 A-coded 8 pin Male

Accelerometer Parameters

Parameter

Condition

Value

Units

Min.

Typ.

Max

Zero Offset Error

-40°C ... +125°C

-20
-1.15

 

20
1.15

mg
°

Offset temperature drift

-40°C ... +125°C
X, Y

-10

 

10

mg

-40°C ... +125°C
Z

-15
-0.86

 

15
0.86

mg
°

Sensitivity

At room temperature

 

12000

 

LSB/g

Linearity Error

 

-4

 

4

mg

Integrated Noise

X, Z

 

0.08

 

mg RMS

Y

 

0.06

 

mg RMS

Noise Density

X, Z

 

20

 

μg/√Hz

Y

 

15

 

μg/√Hz

Cross-Axis Sensitivity

 

-1.5

±0.2

1.5

%

Power consumption

 

Current (mA @Room Temperature)

 

Current (mA @Room Temperature)

Input Voltage (V)

RS232

CAN

5

37

38

12

20

25

24

9

11

36

8

7

Packaging details

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LPMS-INC1 Dimensions (Units:mm)