Ebyte E32(915T30S) User manual

E32-915T30S User Manual
SX1276 915MHz 1W SMD Wireless Module

Chengdu Ebyte Electronic Technology Co,;Ltd E32-915T30S user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
CONTENT
1. OVERVIEW ..............................................................................................................................3
1.1 INT RODUCTION................................................................................................................................................................................3
1.2 FEAT URES.........................................................................................................................................................................................3
2.SPECIFICATION AND PARAMETER .........................................................................................4
2.1 LIMIT PARAMETER..........................................................................................................................................................................4
2.2 OPERATING PARAMETER................................................................................................................................................................4
3 SIZE AND PIN DEFINITION .........................................................................................................5
4 CONNECT TO MCU .......................................................................................................................7
5 FUNCTION DESCRIPTION ..........................................................................................................7
5.1 FIXED TRANSMISSION.....................................................................................................................................................................7
5.2 BROADCAST ING TRANSMISSION ...................................................................................................................................................8
5.6.1 Indication of UART output ...................................................................................................................................................9
5.6.2 Indication of wireless transmitting .....................................................................................................................................9
5.6.3 Configuration procedure of module..................................................................................................................................10
5.6.4 Notes for AUX.......................................................................................................................................................................10
6 OPERATING MODE..................................................................................................................... 11
6.1 MODE SWITCH...............................................................................................................................................................................11
6.2 NORMAL MODE (MODE 0) ............................................................................................................................................................12
6.3 WAKE-UP MODE (MODE 1)...........................................................................................................................................................12
6.4 POWER-SAVING MODE (MODE 2).................................................................................................................................................12
6.5 SLEEP MODE (MODE 3) .................................................................................................................................................................13
7 COMMAND FORMAT..................................................................................................................13
7.1 DEFAULT PARAMETERS.................................................................................................................................................................13
7.2 READING OPERATING PARAMETERS............................................................................................................................................14
7.3 READING VERSION NUMBER........................................................................................................................................................14
7.4 RE SET COMMAND..........................................................................................................................................................................14
7.5 PARAMETER SETTING COMMAND...............................................................................................................................................14
8. HARDWARE DESIGN.................................................................................................................16
9 FAQ..................................................................................................................................................17
9.1 COMMUNICATION RANGE IS TOO SHORT ....................................................................................................................................17
9.2 MODULE IS EASY TO DAMAGE..................................................................................................................................................... 18
9.3 BER(BIT ERROR RAT E) IS HIGH...............................................................................................................................................18
10 PRODUCTION GUIDANCE ......................................................................................................18
10.1 REFLOW SOLDERING TEMPERATURE........................................................................................................................................18
10.2 REFLOW SOLDERING CURVE...................................................................................................................................................... 19
11 E32 SERIES...................................................................................................................................19

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12 ANTENNA RECOMMENDATION ...........................................................................................20
12.1 ANTENNA CHOOSING..............................................................................................................................................................20
13 PACKAGE FOR BATCH ORDER .............................................................................................21
REVISION HISTORY.......................................................................................................................22
ABOUT US .........................................................................................................................................22

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1. Overview
1.1 Introduction
E32-915T30S is a wireless serial port module
(UART) based on SEMTECH's SX1276 RF chip. It has
mu ltip le transmission modes, working in the
900MHz~931MHz, (default 915MHz), Lo Ra spread
spectrum technology, TTL output, compatible 3.3v~5v
IO.
SX1276 features Lo Ra ™, wh ich will bring longer
communicat ion distance, and has the advantages of concentrated power density, meanwh ile it has a very strong
confidentiality. the modules of 30dBm transmitting power adopt industrial grade crystal oscillators to ensure the stability
and consistency, its precision is lower than the widely adopted 10ppm. E32-915T30S is in stable bulk production and are
widely applied in utility meters, IoT renovation, smart home, etc. The modules feature data encryption and compression.
The data transmitted in air features randomness. air Data Rate (Default 2.4kps). The encryption-decryption algorithm
makes data interception meaningless. And the data compression enables shorter transmitting time and lower rate of being
interfered, which increased the reliability and transmitting efficiency.
E32-915T30S strictly follows design standards of FCC, CE, CCC and meets various RF certification requirements
for exporting.
1.2 Features
Communication distance tested is up to 8km
Maximum transmission power of 1W, software multi-level adjustable；
Support the global license-free ISM 915MHz band；
Support air date rate of 0.3kbps～19.2kbps；
Support new generation LoRa technology.
Low power consumption for battery supplied applications ；
Support 3.3V~5.2V power supply, power s upply over 5.0 V can guarantee the best performance；
Industrial grade standard design, support -40 ~ 85 °C for working over a long time；
IPEX and stamp hole optional, good for secondary development and integration.
1.3 Application
Home security alarm and remote keyless entry；
Smart home and industrial sensors；
Wireless alarm security system；

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Building automation solutions ；
Wireless industrial-grade remote control；
Health care products；
Advanced Meter Reading Architecture(AMI)；
Automotive industry applications.
2. Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply（V）
0
5.2
Voltage over 5.2V will cause permanent
damage to module
Blocking power（dBm）
-
-10
Chances of burn is slim when modules
are used in short distance
Operating temperature（℃）
-40
85
-
2.2 Operating parameter
Main parameter
Performance
Remark
Min
Typ.
Max.
Operating voltage（V）
3.3
5.0
5.2
≥5.0 V ensures output power
Communication level（V）
-
3.3
-
For 5V TTL, it may be at risk of
burning down
Operating temperature（℃）
-40
-
85
Industrial design
Operating frequency（M Hz）
900
915
931
Support ISM band
Power
consumption
Transmitting current [mA]
-
600
-
Instant powerconsumption
Receiving current [mA]
-
21
-
-
Turn-off current [μA]
-
5
-
Software is shut down
Max Tx power（dBm）
29.5
-
30.5
-
Receiving sensitivity（dBm）
-145
-147
-148
Air data rate is 2.4kbps
Air data rate（bps）
0.3k
2.4k
19.2k
Controlled via user’s
programming
Main parameter
Description
Remark
Distance for reference
8000m
Test condition：clear and open area, antenna gain: 5dBi，
antenna height: 2.5m，air data rate: 2.4kbps
TX length
58 Byte
Maximum capacity of single package

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Buffer
512 Byte
-
Modulation
LoRa™
-
Communication interface
TTL
@3.3V
Package
SMT
-
Connector
2.54mm
-
Size
25 * 40.5 mm
-
Antenna
IPEX/stamp hole
50 ohm impedance
3 Size and pin definition
No.
Name
Direction
Function
1
M0
Input
（weak pull-up）
With M1, the four working modes of the module can be
determined (it cannot be suspended, and it can be grounded if it is
not used).

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2
M1
Input
（weak pull-up）
With M0, the four working modes of the module can be
determined (it cannot be suspended, and it can be grounded if it is
not used).
3
RXD
Input
TTL UART input , Connect to external TXD output pins; Can be
configured as drain open circuit or pull up input, see parameter
Settings
4
TXD
Output
TTL UART output, Connect to external RXD input pin; Can be
configured as drain open circuit or push - pull output, see
parameter Settings
5
AUX
Output
Used to indicate the working status of the module; The user wakes up the
external MCU and outputs low level during self-test initialization; Can be
configured as drain open output, or push-pull output, see parameter
Settings (can be suspended)
6
VCC
Input
Positive reference of module power supply, voltage range: 2.3v ~
5.2v DC
7
GND
Input
Ground
8
RESET
Input
Reset pins for program loading (dangling, no need for user to
connect)
9
GND
Input
Ground pins for program loading (dangling, no user connection
required)
10
SWIM
Input
SWIM pin for program load (dangling, user does not need to
connect)
11
+3.3V
Input
Power pins for program loading (suspended, no need for user to
connect)
12
PB3
Input/output
NC PINE, This pin needs to be dangling and the user does not
need to connect (for later extension use)
13
PB1
Input/output
NC PINE, This pin needs to be dangling and the user does not
need to connect (for later extension use)
14
PB0
Input/output
NC PINE, This pin needs to be dangling and the user does not
need to connect (for later extension use)
15
GND
-
-
16
GND
-
-
17
GND
-
-
18
ANT
Output
Antenna interface (high frequency signal output,50 ohm
characteristic impedance)

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4 Connect to MCU
No.
Description（STM8L MCU）
1
The UART module is TTL level.
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
5 Function description
5.1 Fixed transmission

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5.2 Broadcasting transmission
5.3 Broadcasting address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
When module is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the
purpose of broadcast is realized.
5.4 Monitor address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;

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When module A is the receiver, it can receive the data sent from all modules under channel 0x04, the purpose of
monitor is realized.
5.5 Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the
operating mode based on user’s parameters. During the process, the AUX remains low level. After the process
completed, the AUX outputs high level and starts to work as per the operating mode combined by M1 and M0.
Therefore, users need to wait the AUX rising edge as the start of module’s normal work.
5.6 AUX description
AUX Pin can be used as indication for wireless send & receive buffer and self-check.
It can indicate whether there are data that are not sent yet via wireless way, or whether all wireless data has been
sent through UART, or whether the module is still in the process of self-check initialization.
5.6.1 Indication of UART output
To wake up external MCU
5.6.2 Indication of wireless transmitting
Buffer (empty): the internal 512 bytes data in the buffer are written to the RFIC (Auto sub -packaging).
When AUX=1, the user can input data less than 512 bytes continuously without overflow. Buffer (not empty): when
AUX=0, the internal 512 bytes data in the buffer have not been written to the RFIC co mpletely. If the user starts to
transmit data at this circumstance, it may cause overtime when the module is waiting for the user data, or
transmitting wireless sub package.
When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, perhaps the
last packet of data is still in transmission.

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5.6.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode
5.6.4 Notes for AUX
No.
Description
1
For function 1 & function 2 mentioned above, the priority should be given to the one with low level output, which means if it
meets each of any low level output condition, AUX outputs low level, if none of the low level condition is met, AUX outputs
high level.
2
When AUX outputs low level, it means the module is busy & cannot conduct operating mode checking. Within 1ms since
AUX outputs high level, the mode switch will be completed.
3
After switching to new operating mode, it will not work in the new mode immediately until AUX rising edge lasts for 2ms .
If AUX stays on the high level, the operating mode switch can be affected immediately.
4
When the user switches to other operating modes from mode 3 (sleep mode) or it’s still in reset process, the module will
reset user parameters, during which AUX outputs low level.

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6 Operating mode
There are four operating modes, which are set by M1 and M0, the details are as follows:
Mode（0-3）
M0
M1
Mode introduction
Remark
0 Normal
0
1
UART and wireless channel are open, transparent
transmission is on
The receiver must work in
mode 0 or mode 1
1 Wake up
1
0
UART and wireless channel are open, the only
difference with mode 0 is that before transmitting data,
increasing the wake up code automatically, so that it can
awake the receiver under mode 3.
The receiver could be 0,1 or 2
2 Power
saving
0
1
UART close, wireless is under air-awaken mode, after
receiving data, UART open and send data.
transmitter must be mode 1,
unable to transmit in this
mode.
3 Sleep
1
1
sleep mode, receiving parameter setting command is
available.
more details on parameter
specification.
6.1Mode switch
The user can decide the operating mode by the co mbination of M1 and M0. The two GPIO of MCU can be used to
switch mode. After modifying M1 or M0, it will start to work in new mode 1ms later if the module is free. If there
are any serial data that are yet to finish wireless transmitting, it will start to work in new mod e after the UART
transmitting fin ished. After the module receives the wireless data & transmits the data through serial port, it will
start to work in new mode after the transmitting finished. Therefore, the mode -switch is only valid when AUX
outputs 1, otherwise it will delay.
For example, in mode 0 or mode 1, if the user inputs massive data consecutively and switches operating mode at the
same time, the mode-switch operation is invalid. New mode checking can only be started after all the user’s data
process completed. It is recommended to check AUX p in out status and wait 2ms after A UX outputs high level
before switching the mode.
If the module switches from other modes to stand -by mode, it will work in stand-by mode only after all the
remained data proces s completed. The feature can be used to save power consumption. For examp le, when the
transmitter works in mode 0, after the external MCU transmits data “12345”, it can switch to sleep mode
immediately without waiting the rising edge of the AUX pin, also the user’s main MCU will go dormancy
immediately. Then the module will transmit all the data through wireless transmission & go dormancy 1ms later
automatically, which reduces MCU working time & save power.
Likewise, this feature can be used in any mode-switch. The module will start to work in new mode within 1ms after
completing present mode task, which enables the user to omit the procedure of AUX inquiry and switch mode
swiftly. For e xample, when switching from transmitting mode to receiving mode, the use r MCU can go dormancy
before mode-switch, using external interrupt function to get AUX change so that the mode-switch can be realized.
This operation is very flexible and efficient. It is totally designed on the basis of the user MCU ’s convenience, at the
same time the work load and power consumption of the whole system have been reduced and the efficiency of
whole system is largely improved.

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6.2Normal mode (mode 0)
When M1 = 0 & M0 = 0, module works in mode 0
Transmitting
The module can receive the user data via serial port, and transmit wireless data package of 58 bytes. When the data
inputted by user is up to 58 byte, the module will start wireless transmission. During which the user can input data
continuously for transmission.
When the required transmission bytes are less than 58 bytes, the module will wait 3-byte time and treat it as data
termination unless continuous data inputted by user. Then the module will transmit all the data through wireless
channel.
When the module receives the first data packet from user, the AUX outputs low level.
After all the data are transmitted into RF chip and transmission start , AUX outputs high level.
At this time, it means that the last wireless data package transmission is started, which enables the user to input
another 512 bytes continuously. The data package transmitted from the module working in mode 0 can only be
received by the module working in mode 0 or 1.
Receiving
The wireless receiving function of the module is on, the data packet transmitted from the module working in mode
0 & mode 1 can be received.
After the data packet is received, the AUX outputs low level, 5ms later the module starts to transmit wireless data
through serial port TXD pin.
After all the wireless data have been transmitted via serial port, the AUX outputs high level.
6.3 Wake-up mode (mode 1)
When M1 = 0 & M0 = 1, module works in mode 1
Transmitting
The condition of data packet transmission & AUX function is the same as mode 0. The only difference is that
the module will add preamble code before each data packet automatically. The preamble code length depends
on the wake-up time set in the user parameters. The purpose of the preamble code is waking up the receiving
module works in mode 2. Therefore, the data package transmitted from mode 1 can be received by mode 0,
mode1 and mode 2.
Receiving
The same as that in mode 0.
6.4 Power-saving mode (mode 2)
When M1 = 1 & M0 = 0, module works in mode 2
Transmitting
UART is closed, the module cannot receive any serial port data from outside M CU.
Hence the function of wireless transmission is not available for the module working in this mode.

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Receiving
In mode 2, it is required the data transmitter works in mode 1.
The wireless module monitors the preamble code at regular time.
Once it gets the preamble code, it will remain as receiving status and waiting for the completion of receiving the
entire valid data package.
Then the AUX outputs low level, 5ms later the serial port is open to transmit received wireless data through
TXD. Finally, AUX outputs high level after process completed.
The wireless module stays in “power-saving – monitoring” working status (polling).
By setting different wake-up time, the module will have different receiving response delay (2s in maximum) and
average power consumption (30uA in minimum).
The user needs to achieve a balance between communication delay time & average power consumption.
6.5 Sleep mode (mode 3)
When M1=1, M0=1, module works in mode 3
Transmitting
N/A
Receiving
N/A
Parameter
setting
This mode can be used for parameter setting. It uses serial port 9600 & 8N1 to set module working parameters
through specific instruction format. (pls refer to parameters setting for details)
Notes
When the mode changes from stand-by mode to others, the module will reset its parameters, during which the
AUX keeps low level and then outputs high level after reset completed. It is recommended to check the AUX
rising edge for user.
7 Command format
In sleep mode（Mode 3：M1=1, M0=1）, it supports below instructions on list.
(Only support 9600 and 8N1 format when setting)
No.
Instruction
format
Illustration
1
C0+working
parameters
C0 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and must
be sent in succession, ( Save the parameters when power-down ).
2
C1+C1+C1
( Save the parameters when power-down )
3
C2+working
parameters
Three C1 are sent in hexadecimal format. The module returns the saved parameters and must
be sent in succession.
4
C3+C3+C3
C2 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and must
be sent in succession. ( Do not save the parameters when power-down )
5
C4+C4+C4
Three C3 are sent in hexadecimal format. The module returns the version information and
they must be sent in succession.
7.1 Default parameters
type
Default parameter values：：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power

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E32-915T30S
915MHz
0x0000
0x0F
2.4kbps
9600
8N1
1W
7.2 Reading operating parameters
Instruction format
Description
C1+C1+C1
In sleep mode（M 0=1，M1=1），
User gives the module instruction (HEX format): C1 C1 C1,
Module returns the present configuration parameters.
For example, C0 00 00 1A 17 44.
7.3 Reading version number
Instruction format
Description
C3+C3+C3
In sleep mode（M 0=1，M1=1）,User gives the module instruction (HEX format): C3 C3
C3,Module returns its present version number, for example C3 32 xx yy. the second bytes means
frequency. 32 here means the frequency is 433MHZ, 38 means frequency is 470MHz, 45 means
frequency is; 868MHz, 44 means the frequency is 915 MHz, 46 means the frequency is
170MHz; xx is the version number and yy refers to the other module features.
7.4 Reset command
Instruction format
Description
C4+C4+C4
In sleep mode（M 0=1，M1=1）,
User gives the module instruction (HEX format): C4 C4 C4, the module resets for one time.
During the reset process, the module will conduct self-check, AUX outputs low level. After reset
completing, the AUX outputs high level, then the module starts to work regularly which the
working mode can be switched or be given another instruction.
7.5 Parameter setting command
No.
Item
Description
Remark
0
HEAD
Fix 0xC0 or 0xC2, it means this frame data is control command
Must be 0xC0 or 0xC2
C0: Save the parameters when
power-down
C2: Do not save the parameters when
power-down
1
ADDH
High address byte of module
（the default 00H）
00H-FFH
2
ADDL
Low address byte of module
（the default 00H）
00H-FFH
3
SPED
7
6
UART parity bit
UART mode can be different

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0
0
8N1 (default)
between communication parties
0
1
8O1
1
0
8 E1
1
1
8N1 (equal to 00)
5
4
3
TTL UART baud rate（bps）
UART baud rate can be different
between communication parties
The UART baud rate has nothing
to do with wireless transmission
parameters & won’t affect the
wireless transmit / receive
features.
0
0
0
1200
0
0
1
2400
0
1
0
4800
0
1
1
9600 (default)
1
0
0
19200
1
0
1
38400
1
1
0
57600
1
1
1
115200
2
1
0
Air data rate（bps）
The lower the air data rate, the
longer the transmitting distance,
better anti-interference
performance and longer
transmitting time
The air data rate must keep the
same for both communication
parties.
0
0
0
0.3k
0
0
1
1.2k
0
1
0
2.4k (default)
0
1
1
4.8k
1
0
0
9.6k
1
0
1
19.2k
1
1
0
19.2k (same to101)
1
1
1
19.2k (same to101)
General Specifications
Except for E32 (400T20S)
4
CHAN
7
6
5
reserved
Write 0
Communication channel
00H-1FH, correspond to
900~931MHz
4 ~0, channel (900MHz+CHAN * 1MHz), default 0FH (915M Hz)
5
OPTIO
N
7
Fixed transmission enabling bit（similar to M ODBUS）
In fixed transmission mode, the
first three bytes of each user's data
frame can be used as high/low
address and channel. The module
changes its address and channel
when transmit. And it will revert to
original setting after complete the
process.
0
Transparent transmission mode
1
Fixed transmission mode
6
IO drive mode (default 1)
This bit is used to the module
internal pull-up resistor. It also
increases the level’s adaptability
in case of open drain. But in some
cases, it may need external
pull-up resistor.
1
TXD and AUX push-pull outputs, RXD pull-up inputs
0
TXD、AUX open-collector outputs, RXD open-collector
inputs
5
4
3
wireless wake-up time
The transmit & receive module
work in mode 0, whose delay time
0
0
0
250ms (default)

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0
0
1
500ms
is invalid & can be arbitrary value.
The transmitter works in mode 1
can transmit the preamble code of
the corresponding time
continuously.
When the receiver works in mode
2, the time means the monitor
interval time (wireless wake-up).
Only the data from transmitter that
works in mode 1 can be received.
0
1
0
750ms
0
1
1
1000ms
1
0
0
1250ms
1
0
1
1500ms
1
1
0
1750ms
1
1
1
2000ms
2
FEC switch
After turn off FEC, the actual data
transmission rate increases while
anti-interference ability decreases.
Also the transmission distance is
relatively short.
Both communication parties must
keep on the same pages about
turn-on or turn-off FEC.
0
Turn off FEC
1
Turn on FEC (default)
1
0
Transmission power (approximation)
The external power must make sure
the ability of current output more than
1A and ensure the power supply ripple
within 100mV.
Low power transmission is not
recommended due to its low power
supply efficiency.
0
0
30dBm (default)
0
1
27dBm
1
0
24dBm
1
1
21dBm
For example: The meaning of No.3 "S PED" byte:
The binary bit of the byte
7
6
5
4
3
2
1
0
Configures by user
0
0
0
1
1
0
1
0
Meaning
UART parity bit 8N1
UART baud rate is 9600
Air data rate is 2.4k
Corresponding hexadecimal
1
A
8. Hardware design
It is reco mmended to use a DC stabilized power supply. The power supply ripple factor is as s mall as possible, and
the module needs to be reliably grounded.；
Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse
connection may cause permanent damage to the module；

Chengdu Ebyte Electronic Technology Co,;Ltd E32-915T30S user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 17
Please check the power supply to ensure it is within the reco mmended voltage otherwise when it exceeds the
maximum value the module will be permanently damaged ；
Please check the stability of the power supply, the voltage can not be fluctuated frequently ；
When designing the power supply circuit for the module, it is often recommende d to reserve more than 30% of the
margin, so the whole machine is beneficial for long-term stable operation.；
The module should be as far away as possible fro m the power supply, transformers, high -frequency wiring and other
parts with large electromagnetic interference.；
High-frequency digital routing, high-frequency analog routing, and power routing must be avoided under the
module. If it is necessary to pass through the module, assume that the module is soldered to the Top Layer, and the
copper is spread on the Top Layer of the module contact part(well grounded), it must be close to the digital part of
the module and routed in the Bottom Layer；
Assuming the module is soldered or placed over the Top Layer, it is wrong to randomly route over the Bottom Layer
or other layers, which will affect the module's spurs and receiving sensitivity to varying degrees ；
It is assumed that there are devices with large electromagnetic interference around the module that will greatly
affect the performance. It is reco mmended to keep them away fro m the module according to the strength of the
interference. If necessary, appropriate isolation and shielding can be done；
Assume that there are traces with large electro magnetic interference (h igh-frequency digital, high-frequency analog,
power traces) around the module that will greatly affect the performance of the module. It is reco mmended to stay
away from the module according to the strength of the interference. If necessary, appropriate isolation and shielding
can be done.
If the communication line uses a 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is
still a risk of damage)；
Try to stay away from some physical layers such as TTL protocol at 2.4GHz , for example: USB3.0；
The mounting structure of antenna has a great influence on the performance of the module. It is necessary to ensure
that the antenna is exposed, preferably vertically upward. When the module is mounted inside the case, use a good
antenna extension cable to extend the antenna to the outside；
The antenna must not be installed inside the metal case, which will cause the transmission distance to be greatly
weakened.
9 FAQ
9.1 Communication range is too short
The communication distance will be affected when obstacle exists.
Data lose rate will be affected by temperature, humidity and co -channel interference.
The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground.
Sea water has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea.
The signal will be affected when the antenna is near metal object or put in a metal case.
Power register was set incorrectly, air data rate is set as too high (the higher the air data rate, the shorter t he
distance).
The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the

Chengdu Ebyte Electronic Technology Co,;Ltd E32-915T30S user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 18
transmitting power.
Due to antenna quality or poor matching between antenna and module.
9.2 Module is easy to damage
Please check the power supply source, ensure it is 2.0V~3.6V, voltage higher than 3.6V will damage the module.
Please check the stability of power source, the voltage cannot fluctuate too much.
Please make sure antistatic measure are taken when installing and using, high frequency devices have electrostatic
susceptibility.
Please ensure the humidity is within limited range, some parts are sensitive to humidity.
Please avoid using modules under too high or too low temperature.
9.3 BER(Bit Error Rate) is high
There are co-channel signal interference nearby, please be away from interference sources or modify frequency and
channel to avoid interference;
Poor power supply may cause messy code. Make sure that the power supply is reliable.
The extension line and feeder quality are poor or too long, so the bit error rate is high;
10 Production guidance
10.1 Reflow soldering temperature
Profile Feature
Curve characteristics
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Solder paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperaturemin （Tsmin）
Minpreheating temp.
100℃
150℃
Preheat temperaturemax (Tsmax)
Mx preheatingtemp.
150℃
200℃
Preheat Time (Tsmin toTsmax)(ts)
Preheating time
60-120 sec
60-120 sec
Average ramp-up rate(Tsmaxto Tp)
Average ramp-up rate
3℃/second max
3℃/second max
Liquidous Temperature(TL)
Liquid phasetemp.
183℃
217℃
Time（tL）Maintained Above（TL）
Time below liquid phaseline
60-90 sec
30-90 sec
Peak temperature（Tp）
Peak temp.
220-235℃
230-250℃
Aveage ramp-down rate（Tp toTsmax）
Aveage ramp-downrate
6℃/second max
6℃/second max
Time 25℃ to peak temperature
Time to peaktemperature for
25℃
max 6 minutes
max 8 minutes

Chengdu Ebyte Electronic Technology Co,;Ltd E32-915T30S user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 19
10.2 Reflow soldering curve
11 E32 series
Model No.
Core IC
Frequency
Hz
Tx
power
dBm
Distance
km
Data Rate
Package
Size
mm
Interface
E32-868T20S
SX1276
868M
20
3
0.3k~19.2k
SMD
16 * 26
UART
E32-915T20S
SX1276
915M
20
3
0.3k~19.2k
SMD
16 * 26
UART
E32-400T20S
SX1278
433M 470M
20
3
0.3k~19.2k
SMD
16 * 26
UART
E32-915T30S
SX1276
915M
30
8
0.3k~19.2k
SMD
25 * 40.3
UART
E32-868T30S
SX1276
868M
30
8
0.3k~19.2k
SMD
25 * 40.3
UART
E32-433T30S
SX1278
433M
30
8
0.3k~19.2k
SMD
25 * 40.3
UART
E32-433T20S2T
SX1278
433M
20
3
0.3k~19.2k
SMD
17 * 30
UART
E32-868T30D
SX1276
868M
30
8
0.3~19.2k
DIP
24 * 43
SMA-K
E32-915T30D
SX1276
915M
30
8
0.3~19.2k
DIP
24 * 43
SMA-K
E32-170T30D
SX1278
170M
30
8
0.3k~9.6k
DIP
24 * 43
SMA-K
E32-868T20D
SX1276
868M
20
3
0.3~19.2k
DIP
21 * 36
SMA-K
E32-915T20D
SX1276
915M
20
3
0.3~19.2k
DIP
21 * 36
SMA-K
E32- 433T20DC
SX1278
433M
20
3
0.3k~19.2k
DIP
21 * 36
SMA-K