Ebyte E32-433T33D User manual

E32-433T33D User Manual
SX1278 433MHz 2W TTL LoRa Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd E32-433T30D User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
CONTENT
1 OVERVIEW .....................................................................................................................................3
1.1 INTRODUCTION ....................................................................................................................................................................................... 3
1.2 FEATURES .................................................................................................................................................................................................3
1.3 APPLICATION ........................................................................................................................................................................................... 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 ............................................................................................................................. 6
5 FUNCTION DESCRIPTION ................................................................................................................7
5.1 FIXED TRANSMISSION (HEXADECIMAL)............................................................................................................................................7
5.2 BROADCASTING TRANSMISSION (HEXADECIMAL)..........................................................................................................................7
5.6.2 Indication of wireless transmitting ........................................................................................................................................... 8
5.6.3 Configuration procedure of module ..........................................................................................................................................9
5.6.4 Notes for AUX ................................................................................................................................................................................ 9
6 OPERATING MODE ...........................................................................................................................10
6.1 MODE SWITCH .....................................................................................................................................................................................10
6.2 NORMAL MODE (MODE 0)..................................................................................................................................................................11
6.3 WAKE-UP MODE (MODE 1) .................................................................................................................................................................11
6.4 POWER-SAVING MODE (MODE 2)......................................................................................................................................................11
6.5 SLEEP MODE (MODE 3).......................................................................................................................................................................12
7 COMMAND FORMAT ....................................................................................................................... 13
7.1 FACTORY DEFAULT PARAMETERS ......................................................................................................................................................13
7.2 READING OPERATING PARAMETERS .................................................................................................................................................13
7.3 READING VERSION NUMBER ............................................................................................................................................................. 13
7.4 RESET COMMAND ................................................................................................................................................................................ 14
7.5 PARAMETER SETTING COMMAND .....................................................................................................................................................14
8 HARDWARE DESIGN ....................................................................................................................... 16
9 FAQ ......................................................................................................................................................... 17

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9.1 COMMUNICATION RANGE IS TOO SHORT ........................................................................................................................................ 17
9.2 MODULE IS EASY TO DAMAGE ..........................................................................................................................................................17
9.3 BER(BIT ERROR RATE)IS HIGH ...................................................................................................................................................... 17
10 PRODUCTION GUIDANCE ........................................................................................................... 18
11 E32 SERIES ......................................................................................................................................... 18
12 ANTENNA RECOMMENDATION ................................................................................................ 19
13 PACKAGE FOR BATCH ORDER ................................................................................................. 19
REVISION HISTORY............................................................................................................................ 19
ABOUT US ................................................................................................................................................ 20

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1 Overview
1.1 Introduction
E32-433T33D is a wireless serial port module (UART) based on SEMTECH's
SX1276 RF chip. It has transparent mode, working in the 410~441MHz (default 433MHz),
LoRa spread spectrum technology.
SX1278 features LoRa spread spectrum, which will bring longer communication
distance, and has the advantages of concentrated power density, meanwhile it has a very
strong confidentiality. SX1278 is a milestone in the field of low-speed communication, and is favored by people in the
industry. The default air rate is 2.4kbps, the transmit power is 33dBm, with PA power amplifier and LNA low-noise
amplifier, so as to improve communication stability and extend communication distance; industrial-grade active
temperature compensated crystal oscillator is used to ensure its stability and consistency.
1.2 Features
Support advanced LoRa modulation method, with the advantage of long-distance anti-interference；
Built-in PA+LNA, the communication distance can reach 16km under ideal conditions, and the transmission
distance is better than traditional GFSK, etc.；
Support fixed-point transmission, broadcast transmission, channel monitoring；
Support air wake-up (ultra low power consumption), suitable for battery applications；
Support FEC forward error correction to improve communication stability；
Maximum transmit power 2W, multi-level software adjustable；
Support global license-free ISM 433MHz frequency band；
Support data transmission rate of 0.3k～19.2kbps；
Support 3.3 ~ 5.2V power supply, more than 5V power supply can ensure the best performance；
Adopt industrial-grade crystal oscillator, industrial-grade standard design, support long-term use at -40 ~ +85 ℃；
SMA-K interface for easy connection of coaxial cable or external antenna.
1.3 Application
Home security alarm and remote keyless entry；
Smart home and industrial sensors；
Wireless alarm security system；
Building automation solutions；
Wireless industrial-grade remote control；
Intelligent intelligent agriculture, oilfield solutions；
Health care products；
Advanced Meter Reading Architecture (AMI)；
Automotive industry applications.

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2 Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Performance
Min.
Min.
Power supply（V）
0
5.5
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
Industrial
2.2 Operating parameter
Main parameter
Performance
Remark
Min.
Typ.
Max.
Operating voltage（V）
3.3
5.0
5.5
≥5.0 V ensures output power
Communication level（V）
3.3
For 5V TTL, it may at risk of burning
down
Operating temperature（℃）
-40
-
+85
Industrial design
Operating frequency（MHz）
410
-
441
Support ISM band
Power
consump
tion
Transmitting current[mA]
850
1000
1200
Instant power consumption
Receiving current [mA]
11
13
15
Turn-off current [μA]
2
Software is shut down
Max Tx power（dBm）
32
33
34
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
16km
Test condition：clear and open area, antenna gain: 5dBi，antenna
height: 2.5m，air data rate: 2.4kbps
TX length
58 Btye
Maximum capacity of single package
Buffer
512 Btye
Modulation
LoRa
Communication interface
UART
TTL
Package
DIP
Connector
1*7*2.54mm
Size
37*60*7.6mm
Antenna
SMA-K
50 ohm impedance

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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).
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: 3.3V ~ 5.2V DC

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7
GND
Input
Ground
8
Fixed orifice
Fixed orifice
9
Fixed orifice
Fixed orifice
10
Fixed orifice
Fixed orifice
11
Fixed orifice
Fixed orifice
12
Fixed orifice
Fixed orifice
13
Fixed orifice
Fixed orifice
14
Fixed orifice
Fixed orifice
15
Fixed orifice
Fixed orifice
4 Connect to MCU
No.
Description（STM8L MCU）
1
The UART module is TTL level.
2
For some MCU works at 5VDC, M00 M11 AUX should connect to IO port of MCU, RX to TXD of MCU, TX to
RXD of MCU.
3
TVS protection and capacitors need to be added outside the power supply (it is recommended to add a 22uF low
ESR electrolytic capacitor or tantalum capacitor)
4
The RF module is sensitive to pulsed static electricity. Do not hot-swap the module.
5
It is recommended to use a power supply above 10W (5V 2A)

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5 Function description
5.1 Fixed transmission (hexadecimal)
5.2 Broadcasting transmission (hexadecimal)
5.3 Broadcasting address

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

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data is still in transmission.
5.6.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode
5.6.4 Notes for AUX
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.
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.
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.
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.
Due to the characteristics of the LoRa, the data transmission delay is much longer than that of FSK. For example, at
1.2kbps airspeed, the transmission delay of 100 bytes is about 1.5 seconds. It is recommended that customers do not
transmit large amounts of data at low air rate, so as to avoid communication exception caused by data loss caused
by data accumulation。

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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
0
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.
6.1 Mode switch
The user can decide the operating mode by the combination 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 mode after the UART
transmitting finished. 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 pin out status and wait 2ms after AUX 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 process completed. The feature can be used to save power consumption. For example, 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 example, when switching from transmitting mode to receiving mode, the user 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

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same time the work load and power consumption of the whole system have been reduced and the efficiency of
whole system is largely improved.
6.2 Normal 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 MCU.
Hence the function of wireless transmission is not available for the module working in this
mode.
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 (80uA in minimum).

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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.

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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.
Format
Description
1
C0+working
parameters
Send C0+5 bytes working parameters in hexadecimal format, a total of 6
bytes, must be sent continuously (power-off save)
2
C1+C1+C1
Send three C1s in hexadecimal format, and the module returns the saved
parameters, which must be sent continuously
3
C2+working
parameters
Send C2+5 bytes working parameters in hexadecimal format, a total of 6
bytes, must be sent continuously (not saved when power off)
4
C3+C3+C3
Send three C3s in hexadecimal format, and the module returns version
information, which must be sent continuously
5
C4+C4+C4
Send three C4s in hexadecimal format, the module will generate a reset and
must be sent continuously
7.1 Factory default parameters
Type
Default parameter values：：C0 00 00 1A 17 40
Model
Frequency
Model
Frequency
Model
Frequency
Model
Frequency
E32-433T33D
433MHz
0x0000
0x17
2.4kbps
9600
8N1
2W
7.2 Reading operating parameters
Instruction format
Description
C1+C1+C1
In sleep mode（M0=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 (M0=1, M1=1), issue a command (HEX format) to the module serial port: C3
C3 C3,
The module returns the current configuration parameters, such as: C3 32 XX YY;
C3 is the command prefix, 32 represents the product model, XX represents the version
number, and YY represents the interface format + the maximum power value of the module
(hexadecimal). The TTL interface is 0x10, RS232 is 0x40, and RS485 is 0x80

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7.4 Reset command
Instruction format
Description
C4+C4+C4
In sleep mode（M0=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
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 between
communication parties
0
0
8N1 (default)
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 to 101）
1
1
1
19.2k（same to 101）
4
CHAN
General Specifications

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7
6
5
reserved
Write 0
Communication channel
00H-1FH，410～441MHz
4～0, channel（410MHz+CHAN * 1MHz）, default 17H
（433MHz）
5
OPTIO
N
7
Fixed transmission enabling bit（similar to
MODBUS）
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 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
0
0
250ms（default）
0
0
1
500ms
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)
Power and current have a non-linear
relationship, and the power supply
efficiency is the highest at the maximum
power;
S
The current does not decrease
proportionally as the power decreases.
0
0
33dBm(default)
0
1
30dBm
1
0
27dBm
1
1
24dBm
For example: The meaning of No.3 "SPED" 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

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8 Hardware design
It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small 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；
Please check the power supply to ensure it is within the recommended 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 recommended 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 from 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 recommended to keep them away from 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 electromagnetic interference (high-frequency digital, high-frequency analog,
power traces) around the module that will greatly affect the performance of the module. It is recommended 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.

Chengdu Ebyte Electronic Technology Co., Ltd E32-433T30D User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 17
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 the
distance).
The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the
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;

Chengdu Ebyte Electronic Technology Co., Ltd E32-433T30D User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 18
10 Production guidance
This type is DIP module, when the welder welds the module, he must be welding according to the anti-static regulation. This
product is allergic to static, randomly welding the module will have the chance of damaging it permanently.
11 E32 series
Model No.
Frequency
Hz
Tx
power
dBm
Distance
km
Data rate
bps
Package
Size
mm
Antenna Interface
E32-170T30D
170M
30
8
0.3k～9.6k
DIP
24*43
SMA-K
E32-433T20DC
433M
20
3
0.3k～19.2k
DIP
21*36
SMA-K
E32-433T20S1
433M
20
3
0.3k～19.2k
SMD
17*25.5
Stamp
E32-433T20S2T
433M
20
3
0.3k～19.2k
SMD
17*30
IPEX/ Stamp
E32-400T20S
433/470M
20
3
0.3k～19.2k
SMD
16*26
IPEX/ Stamp
E32-433T30D
433M
30
8
0.3k～19.2k
DIP
24*43
SMA-K
E32-433T30S
433M
30
8
0.3k～19.2k
SMD
25*40.3
IPEX/ Stamp
E32-868T20D
868M
20
3
0.3k～19.2k
DIP
21*36
SMA-K
E32-868T20S
868M
20
3
0.3k～19.2k
SMD
16*26
IPEX/ Stamp
E32-868T30D
868M
30
8
0.3k～19.2k
DIP
24*43
SMA-K
E32-868T30S
868M
30
8
0.3k～19.2k
SMD
25*40.3
IPEX/ Stamp
E32-915T20D
915M
20
3
0.3k～19.2k
DIP
21*36
SMA-K
E32-915T20S
915M
20
3
0.3k～19.2k
SMD
16*26
IPEX/ Stamp
E32-915T30D
915M
30
8
0.3k～19.2k
DIP
24*43
SMA-K
E32-915T30S
915M
30
8
0.3k～19.2k
SMD
25*40.3
IPEX/ Stamp

Chengdu Ebyte Electronic Technology Co., Ltd E32-433T30D User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 19
12 Antenna recommendation
The antenna is an important role in the communication process. A good antenna can largely improve the
communication system. Therefore, we recommend some antennas for wireless modules with excellent performance and
reasonable price.
Model No.
Type
Frequency
Gain
Size
Cable
Interface
Feature
Hz
dBi
mm
cm
TX433-NP-4310
FPC Antenna
433M
2.0
10x43
-
Solder
Soft FPC antenna
TX433-JZ-5
Rubber Antenna
433M
2.0
52
-
SMA-J
Short straight, omnidirectional
TX433-JZG-6
Rubber Antenna
433M
2.5
62
-
SMA-J
Short straight, omnidirectional
TX433-JW-5
Rubber Antenna
433M
2.0
50
-
SMA-J
Flexible, omnidirectional
TX433-JWG-7
Rubber Antenna
433M
2.5
70
-
SMA-J
Flexible, omnidirectional
TX433-JK-11
Rubber Antenna
433M
2.5
110
-
SMA-J
Flexible, omnidirectional
TX433-JK-20
Rubber Antenna
433M
3.0
200
-
SMA-J
Flexible, omnidirectional
TX433-XPL-100
Sucker Antenna
433M
3.5
185
100
SMA-J
Sucker antenna, cost effective
TX433-XP-200
Sucker Antenna
433M
4.0
190
200
SMA-J
Sucker antenna, low loss
TX433-XPH-300
Sucker Antenna
433M
6.0
965
300
SMA-J
Sucker antenna, high gain
13 Package for batch order
Revision history
Version
Date
Description
Issued by
1.0
2022-4-14
Original
Hyh