Epson M-A550AR2 User Manual

Accelerometer for RS-422-Interface

M-A550AR2x

Data Sheet

(P/N: E91E60814x)

Rev.20160704

NOTICE

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All brands or product names mentioned herein are trademarks and/or registered trademarks of their
respective companies.

©SEIKO EPSON CORPORATION 2016, All rights reserved.

Table of Contents

1. GENERAL DESCRIPTION .......................................................................................... 3

1.1. FEATURES ................................................................................................................................ 3

1.2. BLOCK DIAGRAM .................................................................................................................... 4

2. SPECIFICATIONS ....................................................................................................... 5

2.1. ABSOLUTE MAXIMUM RATINGS ............................................................................................ 5

2.2. RECOMMENDED OPERATING CONDITION ........................................................................... 5

2.3. PERFORMANCE & ELECTRICAL SPECIFICATIONS ............................................................. 6

3. MECHANICAL DIMENSIONS ..................................................................................... 9

3.1. OUTLINE DIMENSIONS ........................................................................................................... 9

3.2. CONNECTOR SPECIFICATIONS ........................................................................................... 10

4. TYPICAL PERFORMANCE CHARACTERISTICS..................................................... 11

5. CONNECTION EXAMPLE ......................................................................................... 12

5.1. CONNECTION TO HOST ........................................................................................................ 12

5.2. PRECAUTION FOR WIRING AND CABLING ........................................................................ 12

5.3. PRECAUTION FOR SUPPLYING POWER ............................................................................. 12

6. BASIC OPERATION .................................................................................................. 14

6.1. OPERATION MODE ................................................................................................................ 14

6.1.1. ST ATE TRANSITION .............................................................................................................. 14

6.1.2. INITIALIZATION INDICATION FUNCTION ........................................................................ 15

6.1.3. BIAS CORRECTION FUNCTION .......................................................................................... 15

6.1.4. OUTPUT UNIT SELECT FUNCTION .................................................................................... 15

6.1.5. OPERATION MODE DESCRIPTION ..................................................................................... 15

6.2. INTERNAL FILTER ................................................................................................................. 16

7. HOST INTERFACE .................................................................................................... 20

7.1. SERIAL INTERFACE SPECIFICATION ............................................................................... 20

7.1.1. COMUNICATION CONDITION ............................................................................................. 20

7.1.2. COMMAND SEQUENCE ........................................................................................................ 20

7.1.3. COMMAND DESCRIPTION ................................................................................................... 21

7.1.4. COMMAND FORMAT ............................................................................................................. 32

8. SAMPLE PROGRAM FLOW ..................................................................................... 36

8.1. RS422 FLOW .......................................................................................................................... 36

9. HANDLING NOTES ................................................................................................... 38

9.1. CAUTIONS FOR ATTACHING ................................................................................................ 38

9.2. OTHER CAUTIONS ................................................................................................................ 38

9.3. LIMITED WARRANTY ............................................................................................................. 39

10. PART NUMBER / ORDERING INFO. ........................................................................ 40

11. PACKING DIMENSIONS ........................................................................................... 41

11.1. PACKING MATERIAL SIZE .................................................................................................... 41

11.2. INNER BOX DESCRIPTION ................................................................................................... 41

11.3. OUTER BOX DESCRIPTION .................................................................................................. 42

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11.4. PACKING LABEL .................................................................................................................... 42

11.5. STORAGE ENVIRONMENT .................................................................................................... 43

12. ST ANDARDS AND APPROVALS ............................................................................. 44

12.1. NOTICE ................................................................................................................................... 44

12.2. CE MARKING .......................................................................................................................... 44

12.3. RoHS & WEEE ........................................................................................................................ 44

12.4. FCC COMPLIANCE STATEMENT FOR AMERICAN USERS ................................................ 44

12.5. INDUSTRY ICES COMPLIANCE STATEMENT FOR CANADIAN USERS ............................ 45

13. REVISION HISTORY ................................................................................................. 46

ii Seiko Epson Corporation M-A550AR2

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1. GENERAL DESCRIPTION

The M-A550AR2x is high accuracy and high stability 3 axis accelerometer. This sensor unit is based on
Quartz technology (QMEMS) for high accuracy, high stability, small size, and low power consumption.
This sensor unit enables wide dynamic range acceleration and vibration sensing. Acceleration, tilt angle
and tilt angular velocity is available as user selectable output measurement options. This sensor unit
uses the latest technology to improve performance and offer wider sensing bandwidth. With RS422
interface supported for host communication, the M-A550AR2x reduces technical barriers for users to
incorporate seismic and vibration sensing, and minimizes design resources to implement control and
monitoring applications. This unit is packaged in a water-proof and dust-proof metallic case making it
suitable for use in industrial and heavy duty applications.
The features of the sensor unit such as high stability, high precision, and small size make it easy to
create and differentiate applications in various fields of industrial systems.

1.1. FEATURES

Item Specification Note

Sensor
Integrated sensor Model : M-A550AR2x

Resolution 0.06uG
Bandwidth 0-50Hz
Detection range ±5G
(Accuracy range ±1G)

Interface
Protocol (DL layer) RS-422 (TX/RX Pair, Full-Duplex transmission)
Bit rate Maximum 460.8kbps (programmable) 460.8kbps(default)
Cable Length 250m (max)
Others
Trigger function Internal timer event trigger function External trigger

Terminator Included (100Ωtyp)
General specification

Voltage supply 9 ~ 30V
Power consumption 15mA typ. (Vin=12V)
Operating temperature

-20 ~ +70°C

range

External dimension
Outer packaging Overall metallic shield case
Size 52×52×26 mm (Not including projection)
Weight 81g
Interface connecter M12, 8pin-male, water-proof
Water-proof, Dust-proof IP67

Regulation
EU CE marking (EN61326、RoHS Directive) ClassA
FCC FCCpart15B ClassA

not available

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1.2. BLOCK DIAGRAM

Figure 1-1 Block Diagram

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r

*

1

2. SPECIFICATIONS

2.1. ABSOLUTE MAXIMUM RATINGS

Table 2-1 Absolute Maximum Ratings

Parameter Min Typ Max Unit

VIN to GND −0.3 +32 V
Voltage on any pin to GND −7 +12 V
Storage temperature range −20 85 °C
Operating temperature range -20 70 °C
Operating humidity (no condensation) 90 %R.H.
Storage humidity (no condensation) 90 %R.H.

Acceleration / Shock (Half-sine 0.5msec) *1 300 G
If the unit is operated beyond the absolute maximum rating, malfunction may occur or the unit may fail
completely. Although the unit may appear to operate normally, reliability may decrease.

CAUTION:

*1

Excessive vibration or shock independent of the above listed conditions may increase the

possibility of malfunction or causing a failure!

2.2. RECOMMENDED OPERATING CONDITION

Table 2-2 Recommended Operating Conditions

Paramete

Power supply voltage VIN VIN to GND *2 9

Port input voltage V
Operating temperature T

*1

When power supply voltage is 9V or less, the master may not be able to communicate with a node

normally even if the LED turns on.

*2

The power supply voltage must reach the recommended operating condition within 2 seconds after

power is applied to a node.

Term Condition Min. Typ Max. Unit

12 24 V

RD+/RD- to GND 3.3 V

PORT

-20 - 70 °C

OPE

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2.3. PERFORMANCE & ELECTRICAL SPECIFICATIONS

Table 2-3 Sensor Specifications (Common Items)

VIN=12V, ±1G unless otherwise noted

Parameter Test Conditions / Comments Min Typ Max Unit

Data output rate *1 500 sps
Frequency range TA=25°C, -3dB down 50 Hz

Misalignment from

mechanical reference

Temperature resolution *2

*1

The data output rate can be changed by user command.

*2

The temperature output is a reference value used for the internal temperature correction, an

-0.5 +0.5 deg

0.001 °C/LSB

d is not guaranteed to accurately output the interior temperature.

Table 2-4 Sensor Specifications (Acceleration)

VIN=12V, ±1G unless otherwise noted

Parameter Test Conditions / Comments Min Typ Max Unit

Detection range *1

Input range *2

Reduced accuracy operating

Accuracy guaranteed by

specification

-5 +5 G

-1 +1 G

Resolution +/-0.06 uG/LSB
Data temperature

Misalignment between
axes

-20～70°C

-4 4 mG

TA=25°C -0.1 +0.1 deg.

Nonlinearity TA=25°C, ±1G -0.03 +0.03 %

Noise density

*1

The range from above ±1G to ±5G is outside the guaranteed accuracy specification.

*2

The calibrated standard 1G gravitational acceleration value is 9.80665 m/s

TA=25°C, average 0.5Hz to 6Hz 0.5 2 uGrms/√Hz
TA=25°C, peak 0.5Hz to 100Hz 60 uGrms/√Hz

2

.

Table 2-5 Sensor Specification (Tilt Angle)

VIN=12V, ±45deg unless otherwise noted

Parameter Condition / Comment Min Typ Max Unit

Input Range *1 Reduced accuracy operating range -1.047 +1.047 rad
Input Range *2 Accuracy guaranteed by specification -0.785 +0.785 rad
Null Offset

Repeatability
Null Offset

TA=25°C and VCC=3.3V for one year after

±3.491 mrad

shipment

-20°C to +85°C -4.014 +4.014 mrad
Temperature
Variation
Axis Alignment

TA=25°C -1.745 +1.745 mrad
Error
Non-Linearity TA=25°C,±45deg. -0.03 +0.03 %

Noise Density TA=25°C, average 0.5Hz to 6Hz, horizontal 0.5 2 µrad/√Hz

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

p

p



Parameter Condition / Comment Min Typ Max Unit

Resolution 0.002 µrad/LSB

NOTE: The Max/Min value is the maximum/minimum value of the design or factory shipment
examination, unless otherwise specified.

*1

The range between ± 45deg to ± 60deg is outside the guaranteed accuracy specifications.

*2

The calibrated standard 1G gravitational acceleration value is 9.80665 m/s2.

The tilt angle is internally calculated from gravitational acceleration by the following expression.

Tilt Angle Calculation Formula

][ asin(G) rad



Table 2-6 Sensor Specification (Tilt Angle Speed)

Condition: T

=-20°C ~ +85°C, VCC=3.15V to 3.45V, and ±45deg, unless otherwise specified.

A

Parameter Condition/Comment Min Typ Max Unit
Calculation

Range

Unitpermillisecondofmeasurementtrigger ‐2.094  +2.094 rad/ms
Unitpersecondofmeasurementtrigger ‐2.094  +2.094 rad/s

Resolution Unitpermilli‐secondofmeasurementtrigger  2  (µrad/s)/LSB

Unitpersecondofmeasurementtrigger  0.002  (µrad/s)/LSB

NOTE: The Max/Min value is the maximum/minimum value of the design or factory shipment
examination, unless otherwise specified.

The tilt angle speed is a change of the tilt angle per unit time between the measurement intervals.
The tilt angle is internally calculated by the following expression.

Tilt Angle Speed Formula

)(





01

: Present tilt angle

1

: Tilt angle measured in previous sample



0

OutputRate_ms: Value of measurement interval by internal timer when command was set. Unit [ms] of measurement trigger.

OutputRate_s: Value of measurement interval by internal timer when command was set. Unit [s] of measurement trigger.

)(





01

1

_

msOutputRate

1

_

sOutputRate

]/[

msrad

]/[

srad

SENSOR
Accelerometer

SENSOR
Temperature

Sampling

Internal Clock
4k Sps/ch

Sampling

Internal Clock
1k Sps

FIR Filter

Moving
Average Filter

128ta

External trg.

Down
Sampling

Out

ut rate

Convert into
Temperature

Temperature
Correction

Alignment
Correction

Format
Conversion

RS422(UART)

Figure 2-1 Functional Block Diagram

Table 2-7 Interface Specification

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*2

TA=25°C, VIN=12V, unless otherwise noted

Parameter Test Conditions Min Typ Max Unit
Driver
Differential Output
Voltage
Common Mode Output
Voltage
Driver Short-Circuit
Current
Rise or Fall Time RL=100Ω 400 ns
Receiver
Input Resistance 100 Ω
Receiver Differential Input
Threshold Voltage
Receiver Input Hysteresis RD- =0V 25 mV
FUNCTIONAL TIMES Time until data is available
Power-On Start-Up Time

*1

Re-Initialization Time Reboot by a command*1 0.7 s

Measurement Wait Time

Command Response Time

*1

The device must not be accessed during initializing.

*2

The device should not be triggered to measure until the elapsed time immediately after the start of measurement.

*3

The measurement interval by the request command must be 500Sps or less.

*4

The timeout period from the last character reception to the “LF" reception. Following a timeout condition, the device issues an

error code response of “#".

RL=100Ω,TD- to TD+ 2 3.3 V
RL=OPEN, TD- to TD+ 3.3 V
RL=100Ω 3 V

-7V=<TD*=<12V -250 300 mA

-7V < RD- < 12V -0.2 0.2 V

*1

Include Initialization

1) REQDAT command Response

2) TSTSLF command Response

3) Command reception timeout
Response except for 1),2),3)

2.0 s

220

*3

1.3 ms
600 ms

*4

520 ms
4 ms

Table 2-8 Current Consumption

Ta=25°C,RL=100

Ω,unless otherwise specified; all voltages are defined with respect to ground; positive

currents flow into the sensor unit.;

Parameter Term Condition Min. Typ Max. Unit

Idle state I

Vin=12V - 10 - mA

IN(ready)

Vin=24V - 5 - mA

Continuous
measurement
mode
Maximum input

Vin=12V - 16 - mA

I

IN(op)

Vin=24V - 10 - mA

I

- - 60 mA

IN(max)

current

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3. MECHANICAL DIMENSIONS

3.1. OUTLINE DIMENSIONS

9(max)

Referen ce Pla n e

4.2

Seria l No .

Figure 3-1 Outline Dimensions (millimeters)

4-M4

Figure 3-2 Recommended Mounting Dimension

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3.2. CONNECTOR SPECIFICATIONS

Figure 3-3 Connector Pin Terminal

Table 3-1 Pin Function Description

Pin No. Mnemonic Type*1 Description
1 NC N/A Do Not Connect

2 VIN S Power Supply (9-30V)
3 GND S 0V
4 TD- O Transmit Data (-)
5 RD+ I Received Data (+)
6 TD+ O Transmit Data (+)
7 NC N/A Do Not Connect
8 RD- I Received Data (-)

*1) Pin Type I :Input, O :Output, I/O :Input/Output, S :Supply, N/A :Not Applicable

Note: Please use an M12-8 pin mating female connector that corresponds to IP67 specifications.

Table 3-2 describes the connector manufacturer and the model number which is used in this

product.

Table 3-2 Conector Part Number

Manufacturer Part Number RoHS Compliant

PHOENIX CONTACT SACC-DSI-MS-8CON-M12-SCO SH

Yes

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4. TYPICAL PERFORMANCE CHARACTERISTICS

Figure 4-1 Noise Density Characteristics

The above graph is a typical example of the product characteristics, and is not guaranteed by the
specification.

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5. CONNECTION EXAMPLE

5.1. CONNECTION TO HOST

Figure 5-1 Connection Example

5.2. PRECAUTION FOR WIRING AND CABLING

・ This product has internal terminator on the receiver port (RD).
・ It is recommended that twisted pair cable with shielding should be used. Each signal pair should

be connected to each cable pair. (ex: RD+ and RD-)

・ It is recommended that shield connects to ground (at the host) when a cable with shield is used.
・ Maximum recommended cable length is 250 meters as a guideline. However, even if the cable

length is within the guidelines, the communication may be unstable or unusable depending on
system environment. The cabling should be evaluated in the target system environment to
confirm proper operation. (Ref: TIA-EIA-422-B ANNEX A)

5.3. PRECAUTION FOR SUPPLYING POWER

・ The user should be aware of serious risks on the power supply exposure to the following:

High voltage noise by increased resistance and inductance on power supply line.
Surge voltage from lightning and environmental equipment.

・ Figure 5-2 describes reference protection circuit against the lightning surge with a surge level

based on IEC61000-4-5, +/-1kV(power supply line to the power supply ground) and
+/-2kV(power supply line to the earth).

VP: CAN_V+ (Power supply)
PGND: CAN_GND (Power supply ground)
FGND: EARTH (System ground earth)
U3039: Surge absorber to line (Okaya Electric Industries)
ERZ-V14D390: Surge absorber to ground (Panasonic)

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Figure 5-2 Surge Protection Circuit

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