Ebyte E43-900T13S3 User manual

E43-900T13S3 User Manual
900MHz Small SMD Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd. E43-900T13S3 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.................................................................................................................................................. 5
2.1 LIMIT PARAMETER...............................................................................................................................................................................5
2.2 OPERATING PARAMETER.....................................................................................................................................................................5
3. SIZE AND PIN DEFINITION................................................................................................................................................................. 7
4. RECOMMENDED WIRING DIAGRAM............................................................................................................................................... 8
5. FUNCTIONAL DETAILS....................................................................................................................................................................... 8
5.1 MODULE RESET.................................................................................................................................................................................. 8
5.2 AUX DESCRIPTION..............................................................................................................................................................................8
5.2.1 Indication of wireless reception..................................................................................................................................................9
5.2.2 Indication of wireless transmitting............................................................................................................................................. 9
5.2.3 Configuration procedure of module........................................................................................................................................... 9
5.3.4 Notes for AUX..........................................................................................................................................................................10
6. OPERATING MODE.............................................................................................................................................................................10
6.1 MODE SWITCHING............................................................................................................................................................................. 11
6.2 TRANSMISSION MODE (MODE) ....................................................................................................................................................... 11
6.3 RSSI MODE (MODE 1)..................................................................................................................................................................... 12
6.4 CONFIGURATION MODE (MODE 2)................................................................................................................................................... 12
6.5 SLEEP MODE (MODE 3）.................................................................................................................................................................. 13
6.6 QUICK COMMUNICATION TEST..........................................................................................................................................................14
7. INSTRUCTION FORMAT.................................................................................................................................................................... 14
7.1 DEFAULT PARAMETER...................................................................................................................................................................... 15
7.2 READING OPERATING PARAMETERS..................................................................................................................................................15
7.3 READING VERSION NUMBER..............................................................................................................................................................15
7.4 PARAMETER SETTING INSTRUCTION..................................................................................................................................................15
8. CONFIGURATION ON COMPUTER DESCRIPTION....................................................................................................................... 17
9. HARDWARE DESIGN..........................................................................................................................................................................18
10. FAQ...................................................................................................................................................................................................... 19
10.1 COMMUNICATION RANGE IS TOO SHORT...................................................................................................................................... 19
10.2MODULE IS EASY TO DAMAGE......................................................................................................................................................... 20
10.3 HIGH BIT ERROR RATE.................................................................................................................................................................. 20
11. WELDING OPERATION GUIDANCE...............................................................................................................................................21
11.1 REFLOW TEMPERATURE.................................................................................................................................................................. 21

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11.2 REFLOW PROFILE............................................................................................................................................................................22
12. ANTENNA GUIDE.............................................................................................................................................................................. 23
12.1 ANTENNA RECOMMENDATION.........................................................................................................................................................23
13 BATCH PACKAGING......................................................................................................................................................................... 24
REVISION HISTORY................................................................................................................................................................................25
ABOUT US................................................................................................................................................................................................ 25

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1. Overview
1.1 Introduction
E43-900T13S3 is an ultra-high performance-to-price wireless data transmission
module launched by Ebyte. It has four working modes and two transmission modes.
Each transmission mode has its own characteristics and can be applied to various
application scenarios. E43-900T13S3 can perfectly support industrial applications, and
the factory has been strictly tested to ensure its industrial reliability.
E43-900T13S3 supports the maximum 13dBm transmission power. Users can set lower output power to save power.
The module works in 900MHz band, TTL level output, compatible with 3.3V IO port voltage.
The module has the functions of data encryption and compression. Modules transmit data in the air, which is random.
Through strict encryption and decryption algorithm, data interception is meaningless. The data compression function has
the probability to reduce the transmission time, reduce the probability of interference, improve reliability and
transmission efficiency. And it is a low-cost wireless serial transceiver module.
1.2 Features
Ultra-small size, only 16x26mm；
Cost-effective solution for high-volume, cost-critical applications;
Under ideal conditions, the measured communication distance can reach 1500m;
Maximum transmission power is 20mW, software multi-stage adjustable;
Support for the global license-free ISM 900MHz band;
Supports data transfer rates of 1.2k, 4.8k, and 9.6kbps;
Support fixed-point transmission, broadcast transmission, channel monitoring;
Support 2.3 ~ 5.5V power supply, greater than 3.3V power supply can guarantee the best performance;
Industrial grade standard design, support long-term use from -40 to +85 °C;
Support stamp hole and IPEX interface, users can choose to use according to their needs
1.3 Application
Wearable device；
Smart homes, industrial sensors, etc;
Security system、positioning system;
Wireless remote control, drone;
Wireless game remote control;

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Health care products;
Wireless voice, wireless headset;
Automotive industry applications.

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2. Specification and parameter
2.1 limit parameter
Main parameter
Performance
Remark
Min
Max
Power supply （V）
0
5.5
Voltage over 5.5V 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 grade
2.2 Operating parameter
Main parameter
Performance
Remark
Min
Type
Max
Operating voltage（V）
2.3
5.0
5.5
≥3.3 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 grade
Operating frequency（GHz）
855
900
931.5
Support ISM band
Power
Consum-ption
TX current
（mA）
33.092
Instant power consumption
RX current
（mA）
12.7634
Sleep current
（μA）
1.9962
Shut down by software
Max TX power（dBm）
12.0
13.0
14.0
Receiving sensitivity（dBm）
-125
-126
-127
Air data rate is 2.4kbps
Air data rate（bps）
1.2k
2.4k
9.6k
User programming to control

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Main parameter
Description
Remark
Reference distance
1500m
Test condition：clear and open area, antenna gain: 5dBi，antenna
height：2.5m air data rate:1.2kbps
Subcontracting method
40Btye
Maximum capacity of single package , Automatic subcontracting
after exceeding.
Cache capacity
80Btye
Modulation
GFSK
Communication interface
UART
TTL level
Package
SMD
Connector
1.27mm
Size
16*26mm
Antenna
IPEX/Stamps
50 ohm impedance

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3. Size and pin definition
No.
Name
Direction
Function
1
GND
Ground wire
2
GND
Ground wire
3
GND
Ground wire
4
GND
Ground wire
5
M0
Input（weak pull-up）
Work with M1 & decide the four operating modes.
Floating is not allowed, can be ground.
6
M1
Input（weak pull-up）
Work with M0 & decide the four operating modes.
Floating is not allowed, can be ground.
7
RXD
Input
TTL UART inputs, connects to external TXD output pin. Can be configured
as open-drain or pull-up input. See details in parameters setting.
8
TXD
Output
TTL UART outputs, connects to external RXD input pin. Can be configured
as open-drain or push-pull output. See details in parameters setting.
9
AUX
Output
To indicate module’s working status & wakes up the external MCU.
During the procedure of self-check initialization, the pin outputs low
level. Can be configured as open-drain output or push-pull output
(floating is allowed).
10
VCC
Power supply reference: 2.3V~5.5V DC
11
GND
Ground wire
12
NC
13
GND
Ground wire
14
NC
15
NC
16
NC

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17
NC
18
NC
19
GND
Ground wire
20
GND
Ground wire
21
ANT
Antenna
22
GND
Ground wire
4. Recommended wiring diagram
No.
Description（STM8L MCU）
1
The UART module is TTL level, please connect with the MCU of 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. Functional Details
5.1 Module Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the
operating mode on the basis of the user parameters. During the process, the AUX keeps 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, the user needs to wait the AUX rising edge as the starting point of module’s normal work..
5.2 AUX description
AUX Pin can be used as indication for wireless send & receive buffer and self-check.

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It can indicate whether there are data that are yet to send 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.
5.2.1 Indication of wireless reception
After the module receives valid wireless data, it will immediately pull down AUX and start the serial port output
data. After the data output is completed, AUX is pulled. high.
5.2.2 Indication of wireless transmitting
Buffer (empty): the internal 80 bytes data in the buffer are written to the RFIC (Auto subpackage). When AUX=1,
the user can input data less than 80 bytes continuously without overflow.
Buffer (not empty): when AUX=0, the internal 80 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 subpackage.
Notes: 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.
5.2.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode.

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5.3.4 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.
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.
6. Operating mode
The module has 4 operation mode, which decided by the status of M1 & M0. Below are the details:
Mode（0-3）
M1
M0
Description
Remark
Mode 0
Transmission
Mode
0
0
UART and wireless channel are open,，The module performs
data transmission and reception according to the set
transmission mode.
The transmission
mode of both senders
and receivers must
be the same.
Mode 1
RSSI Mode
0
1
UART is open, the module will output the RSSI signal strength
value at 100ms timing.
Relative strength
only
Mode 2
Configuration
Mode
1
0
The module can receive serial instructions, check instruction list
for details, fixed baud rate 9600, 8N1
Parameter
configuration
Mode 3
Sleep Mode
1
1
The module enters sleep standby, and both the serial port and
wireless are turned off.

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6.1 Mode switching
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 1 ms 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, 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 the output status of AUX pin and wait 2ms after AUX outputs high level
before switching the mode.
When the module is switched from other mode to sleep mode, if the data has not been processed yet, the module
will process the data (including the receive and send) before entering the sleep mode. This feature can be used for
fast dormancy to save power. For example, the transmitting module works in mode 0, the user initiates the serial
port data “12345”, and then does not have to wait for the AUX pin to be idle (high level), It can be switched to the
sleep mode,and immediately sleeps the users’ main MCU. The module will automatically transmit the user data
through the wireless, and automatically enters sleep mode within 1ms; thus saving the working time of the MCU
and reducing power consumption.
Similarly, any mode switch can use this feature. After the module processes the current mode event, it will
automatically enter the new mode within 1ms. Thereby eliminating the user's work of querying AUX, and achieving
the purpose of fast switching. For example, switching from the transmit mode to the receive mode; the user MCU
can also enter sleep before the mode switch, and use the external interrupt function to acquire the AUX change,
thereby performing mode switching.
This operation is very flexible and efficient, and is designed according to the user's MCU's operation convenience,
and can reduce the workload of the entire system as much as possible, improve system efficiency, and reduce power
consumption.
6.2 Transmission Mode (Mode)

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Type
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 40 bytes.
When the data inputted by user is up to 40 bytes, the module will start wireless transmission. During
which the user can input data continuously for transmission.
When the required transmission bytes are less than 40 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 is started, AUX outputs high level.
At this time, it means that the last wireless data package transmission is started, users can continue
to enter data up to 80 bytes.
The data package transmitted from the module working in mode 0 can only be received by the
module working in mode 0.
Receiving
The wireless receiving function of the module is on, the data packet transmitted from the module
working in mode 0 can be received.After receiving the data packet, the AUX outputs low level, 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 RSSI Mode (Mode 1)
Type
When M1 = 0 & M0 = 1, module works in mode 1.
Transmitting
N/A, the received serial data will be discarded.
Receiving
N/A, only scan the signal strength of the current channel, and output an intensity value (relative value)
through the serial port every 100ms：
BmRSSId
=
130
2
value  RSSI
6.4 Configuration Mode (Mode 2)
Type
When M1=1, M0=1, module works in mode 3
N/A
N/A
Receiving
N/A
Configuratio
n
Can be used for module parameter setting, using serial port 9600, setting module working parameters
through specific instruction format.
Note
When entering the other mode from the setup mode, the module will reconfigure the parameters.
During the configuration process, AUX remains low;
After the completion of the output high level, it is recommended that the user detect the AUX rising
edge.

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6.5 Sleep mode (Mode 3）
Type
When M1=1, M0=1, module works in mode 3
Transmitting
N/A
Receiving
N/A
Note
All other functions of the module are turned off, and the sleep mode can only be exited by the
M1M0 state switch.

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6.6 Quick communication test
Steps
Operation
1
Plug the USB test board (E15-USB-T2) into computer, make sure the driver is installed correctly.
Plug mode-select jumper in the USB test board (M1 = 0，M0 = 0).
2
Choose 5V. (Module supports 2.3～5.5V）。
3
Operate AccessPort software and select the correct serial port code, observe the send window and the
corresponding receive window.
7. Instruction format
In configuration mode（mode 2：M1=1, M0=0）, 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 send in succession. ( Save the parameters when
power-down )
2
C1+C1+C1
Three C1 are sent in hexadecimal format. The module returns the saved
parameters and must be send in succession.

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3
C2 + working
parameters
C2 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in
total and must be send in succession. ( Not save the parameters when
power-down )
4
C3+C3+C3
Three C3 are sent in hexadecimal format. The module returns the version
information and must be send in succession.
7.1 Default parameter
Default parameter values：C0 00 00 18 20 00
Model
Frequency
Address
Channel
Air data rate
Baud rate
Transmitting
Powr
E43-900T13S
3
868.8MHz
0x0000
0x2E
1.2kbps
9600
13dBm
7.2 Reading operating parameters
Instruction format
Description
C1+C1+C1
In sleep mode
（M0=0，
M1=1） ，User gives the module instruction (HEX format): C1
C1 C1,
Module returns the present configuration parameters.，For example：C0 00 00 18 2E
00。
7.3 Reading version number
Instruction format
Description
C3+C3+C3
In setting mode（M0=0，M1=1），User gives the module instruction (HEX format):
C3 C3 C3，
Module returns its present version number, for example：C3 43 xx yy；
43 here means the module model (E43 series); xx is the version number and yy
refers to the other module features.
7.4 Parameter setting instruction
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-off
C2: Do not save the parameters when
power-off.
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
Rate parameters, including serial port rate and air data
rate
7, 6: reserved bit, It’s recommend to write 0
-----------------------------------
UART baud rate can be different

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-------------------------------------------------
5，4，3 TTL serial port rate（bps）
000：serial port baud rate is 1200
001：serial port baud rate is 2400
010：serial port baud rate is 4800
011：serial port baud rate is 9600（default）
100：serial port baud rate is 19200
101：serial port baud rate is 38400
110：serial port baud rate is 57600
111：serial port baud rate is 115200
-------------------------------------------------
2，reserved bit，It’s recommend to write 0
-------------------------------------------------
1，0 Wireless air data rate（bps）
00：air data rate is 1.2k（default）
01：air data rate is 4.8k
10：air data rate is 9.6k
between communication parties
The UART baud rate has nothing
to do with wireless transmission
parameters & won’t affect the
wireless transmit / receive
features.
-----------------------------------
-----------------------------------
The lower the air data rate, the
farther the distance, the stronger
the anti-interference performance
and the longer the transmission
time.
The wireless transmission rate of
both sides must be same.
4
CHAN
5，4，3，2，1，0 Communication channel
Communication frequency（855MHz+ CHAN * 0.3M）
Default 2EH:868.8MHz
00H-FFH，
Correspondnig to 855.0 ~
931.5MHz
5
OPTION
7，Fixed transmission enable bit（similar to
MODBUS）
0：Transparent transmission mode（default）
1：Fixed transmission mode
-------------------------------------------------
6，5，4，3，2 reserved bit，It’s recommend to write
0
-------------------------------------------------
1, 0 transmitting power（Approximate value）
00：13dBm（default）
01：10dBm
10：7dBm
11：3dBm
When It’s 1, the first 3 bytes of
each user data frame as the
channel, high and low addresses.
Change its own address and
channel when transmitting, and
restore the original settings after
completion.
-----------------------------------
-----------------------------------
The external power supply must
provide more than 100mA current
output capability. And ensure that
the power supply ripple is less
than 100mV.
It is not recommended to use a
smaller power transmission, and
its power utilization efficiency is
not high.
For example: The meaning of No.3 "SPED" byte：
The binary bit of the
byte
7
6
5
4
3
2
1
0
The specific value
(user configures)
0
0
0
1
1
0
0
0
Meaning
reserved bit
UART baud rate is 9600
Air data rate is 1.2k
Corresponding
hexadecimal
1
8

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8. Configuration on Computer Description
The following figure is E43-900T13S3 configuration host computer display interface. Users can switch to setting
mode through M0 and M1 (M0 = 0, M1 = 1), and quickly configure and read parameters on the computer.

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In the configuration PC, the module address and frequency channel are displayed in decimal mode, and the range of
parameters is:
Module Address：0～65535
Frequency Channel：0～255
9. Hardware Design
It is recommended to use DC stabilized power supply to supply power to the module. The power supply ripple
coefficient 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. If the reverse
connection is connected, the module may be permanently damaged.
Please check the power supply to ensure that between the recommended supply voltage, if exceeding the maximum,
the module will be permanently damaged.
Please check the stability of the power supply, the voltage can not be significantly frequent.
When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the
margin, and 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 traces, high-frequency analog traces, and power traces 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

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spread on the Top Layer of the module contact part(All copper-covered and well grounded), and must be close to
the digital part of the module and routed in the Bottom Layer.
Assuming the module is soldered or placed in the Top Layer, it is also wrong to randomly route the Bottom Layer or
other layers, which will affect the module's spurs and receiving sensitivity to varying degrees.
Assuming that there are devices with large electromagnetic interference around the module, the performance of the
module will also be greatly affected. According to the intensity of the interference, it is suggested to stay away from
the module appropriately. If circumstances permit, appropriate isolation and shielding can be done.
Assume that there are traces with large electromagnetic interference around the module (high-frequency digital,
high-frequency analog, power trace), which 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 and also have a 2.4GHz TTL protocol, for example: USB3.0.
The antenna mounting structure 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 of the case.
The antenna must not be installed inside the metal case, which will greatly reduce the transmission distance.
10. FAQ
10.1 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).
When the power supply at room temperature is lower than the recommended low voltage, the lower the voltage is,