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BE-252Q
GNSS Module User Manual
Shenzhen Beitian Communication Co., Ltd.
Whole Floor 9, Building 1, Phase 5, Fucheng Digital Innovation Park, Shijing Road,Fucheng Street, Longhua District, Shenzhen
Tel: 0755-22225474 Fax: 0755-22225474
www.beitian.com
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Revision History
Revisions
Revision History
Date
P1.0
Updated version
2025-04-25
P2.0
Updated Baud rate
2025-07-08
Declaration
Beitian owns the copyright of this non-publicly published instruction manual and has the right to treat it
as confidential information. This instruction manual is only used as a reference for operating,
maintaining and repairing the product, and no one else has the right to disclose this instruction manual to
others.
This instruction manual contains proprietary information protected by copyright law. All rights reserved.
No part of this instruction manual may be photographed, copied or translated into other languages
without Beitian's written consent.
The contents of this instruction manual may be changed without notice.
Manufacturer's Responsibilities
Beitian is responsible for the safety, reliability and performance of the module only in the following
cases:
Assembly, expansion, readjustment, improvement or repair are performed by personnel approved by
the company; the equipment is used in accordance with the operating requirements.
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Catalog
GNSS Module User Manual ..................................................................................................................... 1
Declaration ............................................................................................................................................... 2
Manufacturer's Responsibilities ................................................................................................................ 2
1. FUNCTIONAL DESCRIPTION ....................................................................................................... 4
1.1. OVERVIEW ...................................................................................................................................... 4
1.3. PERFORMANCE .............................................................................................................................. 5
....................................................................................................................................................................
Figure 1-3 Module size diagram ............................................................................................................... 9
2. Module interface description ................................................................................................................ 9
2.2.0 MODULE INTERFACE DESCRIPTION .................................................................................. 10
3. Mechanical properties ...................................................................................................................... 16
4. Precautions ....................................................................................................................................... 16
4.1. Other ................................................................................................................................................ 16
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1. FUNCTIONAL DESCRIPTION
1.1. OVERVIEW
The BE-252Q GNSS module is a high-performance satellite positioning module that provides
superior sensitivity and acquisition time for all L1 GNSS systems. The extremely low power consumption
of < 15 milliwatts in continuous tracking mode enables all battery-powered devices such as asset trackers
to have strong endurance without sacrificing GNSS performance.
The BE-252Q supports simultaneous reception of four GNSS (GPS, GLONASS, Galileo and
BeiDou). The high number of visible satellites allows the receiver to select the best signal to maximize
position availability, especially in challenging conditions such as deep canyons in cities. BE-252Q (Super
Signal) technology provides excellent RF sensitivity and can improve dynamic position accuracy by up to
25% with small antennas or non-line-of-sight scenarios.
BE-252Q detects jamming and spoofing events and reports them to the host so that the system can
react to such events. Advanced filtering algorithms mitigate the effects of RF interference and interference,
allowing the product to operate as intended.
1.2. PRODUCT FEATURES
sumption is less than 15 mW without compromising GNSS performance
availability
jamming detection
4mm.
the serial port.
QMC5883L
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1.3. PERFORMANCE
Table 1-1 BE-252Q module main performance indicators
Item
Description
Electrical
Characteristic
Chip
M10050
Receiver type
GPS L1 C/A, QZSS L1 C/A/S,BDS B1I/B1C, Galileo
E1B/C,SBAS L1 C/A: WAAS, EGNOS, MSAS, GAGAN
Default position system
GPS, BDS, GALILEO
Augmentation system
SBAS, QZSS
Channel
N/A
Sensitivity
Tracking & Navigation
-166dBm
Reacquisition
-160dBm
Cold start
-148dBm
Hot Start
-160dBm
Accuracy
Horizontal position
2.0m CEP
Velocity
0.05m/s
Dynamic heading
0.3 deg
Time pulse
RMS 30ns
99% 60ns
Acquisition
Cold start
27s
Hot start
1s
Aided start
1s
Data Output
Baud rate
4800bps - 921600bps,default 115200bps
Level
TTL level
UBX messages
PVT
Protocol
NMEA,UBX
NMEA messages
RMC,VTG,GGA,GSA,GSV,GLL
Update rate
0.25Hz-18Hz,default 10Hz
FLASH
With FLASH, the configuration can be changed, and the
power will not be lost
Frequency of time pulse
signal
Configurable from 0.25 Hz to 10 MHz, the default period is
1s, and the high level lasts for 100ms
Operational
Limits
Altitude
80,000m
Velocity
500m/s
Dynamics
<4g
Power
Consumption
Voltage
DC 3.6V-5.5V, typical: 5.0V
Current
30mA/5.0V
Physical Speci-
cations
Dimension
25*25*8mm
Weight
13.5g
Connector
1.00/6P unlocked, horizontal SMD socket
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Temperature
Operating
-40 °C ~ +85°C
Storage
-40°C ~ +105°C
LED
Built-in LED
TX LED: blue. The data output, TX LED flashing
PPS LED: red. PPS LED not bright when GPS not fixed,
flashing when fixed
Compass
Compass
Built-in compass, With electronic compass IC QMC5883L
1.4. PIN DEFINITION
PIN
Name
I/O
Description
1
TX
O
Serial Data Output.
2
RX
I
Serial Data input.
3
GND
G
Ground
4
VCC
I
DC 3.6V~ 5.5V supply input,Typical: 5.0V
5
SCL
I
Compass SCL
6
SDA
O
Compass SDA
1.5. REAR VIEW
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The position of the electronic compass IC QMC5883L , indicating the
direction:
1.6. LED
1. Blue light, TX light, blue light flashing when powered on, indicating that there is data output.
2. Red light, PPS light, the light is not lit if it is not positioned; After 3D positioning, it starts
flashing.
1.7. Application
Vehicle positioning and navigation
Timing
Wearables
IoT positioning devices
UAV, flight control field
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1.8. Functional Frame Diagram
（Front view）
（Rear view）
Figure 1-2 BE-252Q module functional block diagram
GPS Module
Reserved
port
Serial port output
LED
Lights
Ceramic antenna
Compass
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1.9.Dimension
Figure 1-3 Module size diagram
2. Module interface description
2.1. Hardware Interface
2.1.1 Power supply
The module has a power input pin VCC, where VCC is the main power supply for the module; the
farad capacitor stores energy and supplies power to the RTC circuit when the main power supply VCC
is powered off, ensuring that key information is not lost, so as to achieve the hot start function.
2.1.2 Module serial port
Pin interface：
1.00 6pin：TX、RX、GND、VCC、SCL、SDA
2.1.3 1PPS Signal Interface
NO
2.1.4 UART Interface
The module is designed with UART serial port 1.00 pitch 6pin socket, which are (TX) and (RX)
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respectively. The serial port outputs NMEA data at the UTC second boundary, and the host computer can
also switch the working mode and upgrade the software of the module through the serial port. The baud
rate supported by the module ranges from 4800bps - 921600bps, and the default is 115200bps. The data
format is 1 bit for the start bit, 8 bits for the data bit, 1 bit for the stop bit, and no check bit. It can be used
to output data in a custom format and can also be used for software upgrades.
2.2.0 MODULE INTERFACE DESCRIPTION
Data output protocol
Joint Mode Protocol Header - GN
GPS Mode Protocol Header-GP
GLONASS Mode Protocol Header-GL
Beidou mode protocol header - GB or BD
Unlocated
：
$GNRMC,,V,,,,,,,,,,N,V*37
$GNVTG,,,,,,,,,N*2E
$GNGGA,,,,,,0,00,99.99,,,,,,*56
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,1*33
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,3*31
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,4*36
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,5*37
$GPGSV,1,1,00,0*65
$GAGSV,1,1,00,0*74
$GBGSV,1,1,00,0*77
$GQGSV,1,1,00,0*64
$GNGLL,,,,,,V,N*7A
Positioned
：
$GNRMC,054411.00,A,2243.08151,N,11401.10827,E,0.008,,230423,,,A,V*1E
$GNVTG,,T,,M,0.008,N,0.016,K,A*32
$GNGGA,054411.00,2243.08151,N,11401.10827,E,1,12,0.56,93.2,M,-2.7,M,,*64
$GNGSA,A,3,30,03,14,06,07,17,01,19,,,,,1.15,0.56,1.00,1*0D
$GNGSA,A,3,30,13,15,34,27,02,,,,,,,1.15,0.56,1.00,3*01
$GNGSA,A,3,27,28,30,01,02,03,37,38,40,,,,1.15,0.56,1.00,4*04
$GNGSA,A,3,02,07,03,04,,,,,,,,,1.15,0.56,1.00,5*00
$GPGSV,3,1,12,01,27,034,37,03,44,087,39,06,38,241,42,07,15,180,35,1*64
$GPGSV,3,2,12,14,78,359,45,17,43,333,38,19,28,303,39,30,34,212,39,1*6C
$GPGSV,3,3,12,39,29,252,33,40,20,257,40,41,46,237,44,50,60,149,39,1*65
$GPGSV,1,1,01,11,00,228,,0*5C
$GAGSV,2,1,06,02,30,136,38,13,23,238,40,15,68,289,42,27,37,324,30,7*7E
$GAGSV,2,2,06,30,83,091,42,34,41,026,41,7*70
$GBGSV,3,1,11,01,47,123,36,02,46,234,37,03,63,189,38,04,,,31,1*49
$GBGSV,3,2,11,05,,,34,27,52,351,44,28,24,046,37,30,31,283,40,1*46
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$GBGSV,3,3,11,37,43,178,40,38,70,172,40,40,57,034,39,1*48
$GQGSV,1,1,04,02,63,125,42,03,59,044,39,04,38,131,38,07,60,149,36,1*6C
$GNGLL,2243.08151,N,11401.10827,E,054411.00,A,A*71
$xxGGA,time,lat,NS,lon,EW,quality,numSV,HDOP,alt,altUnit,sep,sepUnit,diffAge,diffStation*c
s<CR><LF>
Example:
$GPGGA,092725.00,4717.11399,N,00833.91590,E,1,08,1.01,499.6,M,48.0,M,,*5B
Field
No.
Name
Unit
Format
Example
Description
0
xxGGA
-
string
$GPGGA
GGA Message ID (xx = current Talker ID, see
NMEA Talker IDs table)
1
time
-
hhmmss.ss
092725.00
UTC time, see note on UTC representation
2
lat
-
ddmm.
mmmmm
4717.11399
Latitude (degrees & minutes), see format
description
3
NS
-
character
N
North/South indicator
4
lon
-
dddmm.
mmmmm
00833.91590
Longitude (degrees & minutes), see format
description
5
EW
-
character
E
East/West indicator
6
quality
-
digit
1
Quality indicator for position fix, see position
fix flags description Flags in NMEA 4.10 and
above
7
numSV
-
numeric
08
Number of satellites used (range: 0-12)
8
HDOP
-
numeric
1.01
Horizontal Dilution of Precision
9
alt
m
numeric
499.6
Altitude above mean sea level
Field
No.
Name
Unit
Format
Example
Description
10
altUnit
-
character
M
Altitude units: M (meters, fixed field)
11
sep
m
numeric
48.0
Geoid separation: difference between
ellipsoid
and mean sea level
12
sepUnit
-
character
M
Geoid separation units: M (meters, fixed
field)
13
diffAge
s
numeric
-
Age of differential corrections (null when
DGPS is not used)
14
diffStat
ion
-
numeric
-
ID of station providing differential corrections
(null when DGPS is not used)
15
cs
-
hexadecim
al
*5B
Checksum
16
<CR><LF>
-
character
-
Carriage return and line feed
$xxGLL,lat,NS,lon,EW,time,status,posMode*cs<CR><LF>
Example:
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$GPGLL,4717.11364,N,00833.91565,E,092321.00,A,A*60
Field
No.
Name
Unit
Format
Example
Description
0
xxGLL
-
string
$GPGLL
GLL Message ID (xx = current Talker ID, see
NMEA Talker IDs table)
1
lat
-
ddmm.
mmmmm
4717.11364
Latitude (degrees & minutes), see format
description
2
NS
-
character
N
North/South indicator
3
lon
-
dddmm.
mmmmm
00833.91565
Longitude (degrees & minutes), see format
description
4
EW
-
character
E
East/West indicator
5
time
-
hhmmss.ss
092321.00
UTC time, see note on UTC representation
6
status
-
character
A
Data validity status, see position fix flags
description
7
posMode
-
character
A
Positioning mode, see position fix flags
description (only available in NMEA 2.3 and
later)
Field
No.
Name
Unit
Format
Example
Description
8
cs
-
hexadecimal
*60
Checksum
9
<CR><LF>
-
character
-
Carriage return and line feed
$xxGSA,opMode,navMode{,svid},PDOP,HDOP,VDOP,systemId*cs<CR><LF>
Example:
$GPGSA,A,3,23,29,07,08,09,18,26,28,,,,,1.94,1.18,1.54,1*0D
Field
No.
Name
Unit
Format
Example
Description
0
xxGSA
-
string
$GPGSA
GSA Message ID (xx = current Talker ID, see
NMEA Talker IDs table)
1
opMode
-
character
A
Operation mode:
M = Manually set to operate in 2D or 3D mode
A = Automatically switching between 2D or 3D
mode
2
navMode
-
digit
3
Navigation mode, see position fix flags
description
Start of repeated block (12 times)
3 +
1*N
svid
-
numeric
29
Satellite number
End of repeated block
15
PDOP
-
numeric
1.94
Position dilution of precision
16
HDOP
-
numeric
1.18
Horizontal dilution of precision
17
VDOP
-
numeric
1.54
Vertical dilution of precision
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18
systemId
-
numeric
1
NMEA defined GNSS System ID, see Signal
Identifiers table (only available in NMEA 4.10
and later)
19
cs
-
hexadecimal
*0D
Checksum
20
<CR><LF>
-
character
-
Carriage return and line feed
$xxGSV,numMsg,msgNum,numSV{,svid,elv,az,cno},signalId*cs<CR><LF>
Example:
$GPGSV,3,1,09,09,,,17,10,,,40,12,,,49,13,,,35,1*6F
$GPGSV,3,2,09,15,,,44,17,,,45,19,,,44,24,,,50,1*64
$GPGSV,3,3,09,25,,,40,1*6E
$GPGSV,1,1,03,12,,,42,24,,,47,32,,,37,5*66
$GAGSV,1,1,00,2*76
Field
No.
Name
Unit
Format
Example
Description
0
xxGSV
-
string
$GPGSV
GSV Message ID (xx = GSV Talker ID, see
NMEA Talker IDs table). Talker ID GN shall not
be used
1
numMsg
-
digit
3
Number of messages, total number of GSV
messages being output (range: 1-9)
2
msgNum
-
digit
1
Number of this message (range: 1-numMsg)
3
numSV
-
numeric
10
Number of known satellites in view regarding
both the talker ID and the signalId
Start of repeated block (1..4 times)
4 +
4*N
svid
-
numeric
23
Satellite ID
5 +
4*N
elv
deg
numeric
38
Elevation (range: 0-90)
6 +
4*N
az
deg
numeric
230
Azimuth (range: 0-359)
7 +
4*N
cno
dB
Hz
numeric
44
Signal strength (C/N0, range: 0-99), null when
not tracking
End of repeated block
Field
No.
Name
Unit
Format
Example
Description
5..
16
signalId
-
numeric
0
NMEA defined GNSS Signal ID, see Signal
Identifiers table (only available in NMEA 4.10
and later)
6..
16
cs
-
hexadecimal
*7F
Checksum
7..
16
<CR><LF>
-
character
-
Carriage return and line feed
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$xxRMC,time,status,lat,NS,lon,EW,spd,cog,date,mv,mvEW,posMode,navStatus*cs<CR><LF>
Example:
$GPRMC,083559.00,A,4717.11437,N,00833.91522,E,0.004,77.52,091202,,,A,V*57
Field
No.
Name
Unit
Format
Example
Description
0
xxRMC
-
string
$GPRMC
RMC Message ID (xx = current Talker ID, see
NMEA Talker IDs table)
1
time
-
hhmmss.ss
083559.00
UTC time, see note on UTC representation
2
status
-
character
A
Data validity status, see position fix flags
description
3
lat
-
ddmm.
mmmmm
4717.11437
Latitude (degrees & minutes), see format
description
4
NS
-
character
N
North/South indicator
5
lon
-
dddmm.
mmmmm
00833.91522
Longitude (degrees & minutes), see format
description
6
EW
-
character
E
East/West indicator
7
spd
kno
ts
numeric
0.004
Speed over ground
8
cog
deg
ree s
numeric
77.52
Course over ground
Field
No.
Name
Unit
Format
Example
Description
9
date
-
ddmmyy
091202
Date in day, month, year format, see note on
UTC representation
10
mv
deg
ree s
numeric
-
Magnetic variation value. Only supported in
ADR 4.10 and later
11
mvEW
-
character
-
Magnetic variation E/W indicator. Only
supported in ADR 4.10 and later
12
posMode
-
character
A
Mode Indicator, see position fix flags
description (only available in NMEA 2.3 and
later)
13
navStatu
s
-
character
V
Navigational status indicator: V (Equipment is
not providing navigational status information,
fixed field, only available in NMEA 4.10 and
later)
14
cs
-
hexadecimal
*57
Checksum
15
<CR><L
F>
-
character
-
Carriage return and line feed
$xxVTG,cogt,cogtUnit,cogm,cogmUnit,sogn,sognUnit,sogk,sogkUnit,posMode*cs<CR><LF>
Example:
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$GPVTG,77.52,T,,M,0.004,N,0.008,K,A*06
Field
No.
Name
Unit
Format
Example
Description
0
xxVTG
-
string
$GPVTG
VTG Message ID (xx = current Talker ID, see
NMEA Talker IDs table)
1
cogt
deg
ree
s
numeric
77.52
Course over ground (true)
2
cogtUnit
-
character
T
Course over ground units: T (degrees true,
fixed field)
3
cogm
deg
ree
s
numeric
-
Course over ground (magnetic). Only
supported in ADR 4.10 and above
4
cogmUnit
-
character
M
Course over ground units: M (degrees
magnetic, fixed field)
5
sogn
kno
ts
numeric
0.004
Speed over ground
6
sognUnit
-
character
N
Speed over ground units: N (knots, fixed field)
Field
No.
Name
Unit
Format
Example
Description
7
sogk
km/
h
numeric
0.008
Speed over ground
8
sogkUnit
-
character
K
Speed over ground units: K (kilometers per
hour, fixed field)
9
posMode
-
character
A
Mode Indicator, see position fix flags
description (only available in NMEA 2.3 and
later)
10
cs
-
hexadecimal
*06
Checksum
11
<CR><LF>
-
character
-
Carriage return and line feed
Flags in NMEA 4.10 and above
NMEA Message
Field
GLL, RMC
status
GGA
quality
GLL, VTG
posMode
RMC, GNS
posMode
No position fix (at power-up, after losing satellite lock)
V
0
N
N
GNSS fix, but user limits exceeded
V
0
N
N
Dead reckoning fix, but user limits exceeded
V
6
E
E
Dead reckoning fix
A
6
E
E
RTK float
A
5
D
F
RTK fixed
A
4
D
R
2D GNSS fix
A
1
/ 2
A / D
A / D
3D GNSS fix
A
1
/ 2
A / D
A / D
Combined GNSS/dead reckoning fix
A
1
/ 2
A / D
A / D
See below (1)
See below(2)
See below
(3)
See below
(3)
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(1)
Possible values for status: V = Data invalid, A = Data valid
(2)
Possible values for quality: 0 = No fix, 1 = Autonomous GNSS fix, 2 = Differential
GNSS fix, 4 =RTK fixed, 5 = RTK float, 6 = Estimated/Dead reckoning fix
(3)
Possible values for posMode: N = No fix, E = Estimated/Dead reckoning fix, A =
Autonomous GNSS fix, D = Differential GNSS fix, F = RTK float, R = RTK fixed
3. Mechanical properties
3.1. INSTALLATION GUIDE
After removing the module, please carefully check whether the components are obviously loose or damaged.
Users can also use other modules for installation in the same way.
Figure 3-2 Connection diagram
4. Precautions
4.1. Other
1）The module's VCC power supply ripple should be controlled within 30mA/5.0V as much as
possible, and interference on the power supply should be avoided.
2）Please ensure that the baud rate of the host computer is consistent with that of the module.
3）Please control the temperature when welding the module to avoid damage to the module.
4）To ensure the hot start function of the module, please ensure that the backup power supply is
normal.
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FCC Warning Statement
This product has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This product generates uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this product does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
‐‐ Reorient or relocate the receiving antenna of the radio/TV.
‐‐ Increase the separation between the equipment and receiver(radio/TV).
‐‐ Connect the equipment into an outlet on a circuit different from that to which the
receiver(radio/TV) is connected.
‐‐ Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1)This device may not cause harmful interference.
(2)This device must accept any interference received, including interference that may cause
undesired operation.
