Ebyte E330-400T13S User manual

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
1
E330-400T13S User Manual
433/470MHz 20mW wireless module

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
Content
DISCLAIMER............................................................................................................................................................................................. 3
1. OVERVIEW.............................................................................................................................................................................................4
1.1 PRODUCT INTRODUCTION..............................................................................................................................................4
1.2 FEATURES...................................................................................................................................................................... 4
1.3 APPLICATION..................................................................................................................................................................4
2. SPECIFICATIONS...................................................................................................................................................................................5
3. MECHANICAL PROPERTIES............................................................................................................................................................... 6
4. CONNECTION DIAGRAM....................................................................................................................................................................7
5. DETAILED FUNCTION......................................................................................................................................................................... 8
5.1 LDC RECEPTION............................................................................................................................................................ 8
5.2 SINGLE POINT WAKEUP.................................................................................................................................................. 8
5.3 MODULE RESET............................................................................................................................................................. 9
5.4 AUX.............................................................................................................................................................................. 9
5.5 MATTERS NEEDING ATTENTION......................................................................................................................................9
6. OPERATING MODE.............................................................................................................................................................................10
6.1 MODE SWITCH............................................................................................................................................................. 10
6.2 NORMAL MODE (MODE 0)............................................................................................................................................11
6.3 RECEIVING MODE (MODE 1)........................................................................................................................................ 11
6.4 CONFIGURATION MODE (MODE 2)................................................................................................................................11
6.5 DEEP SLEEP MODE (MODE 3)....................................................................................................................................... 11
7. REGISTER READ AND WRITE CONTROL......................................................................................................................................12
7.1 INSTRUCTION FORMAT................................................................................................................................................. 12
7.2 WORKING PARAMETER READING................................................................................................................................. 12
7.3 VERSION NUMBER READ..............................................................................................................................................12
7.4 RESET COMMAND........................................................................................................................................................ 13
7.5 PARAMETER SETTING INSTRUCTION............................................................................................................................ 13
7.6 FACTORY DEFAULT PARAMETERS................................................................................................................................. 14
8. HOST COMPUTER CONFIGURATION INSTRUCTIONS............................................................................................................... 15
9. HARDWARE DESIGN......................................................................................................................................................................... 15
10. COMMON PROBLEMS..................................................................................................................................................................... 16
10.1 TRANSMISSION DISTANCE IS NOT IDEAL.................................................................................................................... 16
10.2 MODULE IS EASILY DAMAGED................................................................................................................................... 16
10.3 BIT ERROR RATE IS TOO HIGH.................................................................................................................................... 17
11. WELDING OPERATION GUIDANCE.............................................................................................................................................. 17
12. ANTENNA GUIDE............................................................................................................................................................................. 17
12.1 ANTENNA RECOMMENDATION....................................................................................................................................17
REVISE HISTORY....................................................................................................................................................................................18
13. ABOUT US.......................................................................................................................................................................................... 18

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
3
Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
4
1. Overview
1.1 Product Introduction
E330-400T13S is a small size, low power consumption, low cost,
ultra-high cost-effective serial port module, integrated transceiver, covering
433MHz and 470MHz frequency bands. The module supports transparent
transmission and fixed-point transmission mode, supports LDC single-point
wake-up, software multi-level airspeed adjustable, and can be applied to a
variety of wireless transmission applications. At the same time, the module
is simple and easy to use, and you can get started quickly without
complicated configuration, so that it can be used immediately.
1.2 Features
Small size: 16*26mm;
Low power consumption: LDC ultra-low power consumption receiving mode;
Support transparent transmission and fixed-point transmission;
Single-point wake-up: The module can support low-power single-point wake-up to solve the problem of false
wake-up at the same frequency and reduce the overall power consumption of the system;
Support 2~25kbps multi-level transmission rate adjustable;
Multi-level adjustable output power;
Support up to 164 physical channels configurable, covering 433MHz and 470MHz frequency bands;
1.3 Application
Industrial intelligent gateway;
Industrial sensors;
Wireless alarm security system;
Wireless remote control;
Smart agriculture;
Sensor to cloud;
Intelligent light control system;

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
5
2. Specifications
2.1 Limit parameters
main parameters
Minimum
Typical value
Max
Remark
voltage （V）
3
3.3/5
5.5
Over 5.5V may burn the
module permanently
(Consider wide-voltage
power supply when
designing)
Working frequency （MHz）
410
433
493
Channel spacing 0.5MHz
Emission current (mA)
-
32mA
433MHz@13dBm
Receive current （mA）
6mA
Regular receipt
Sleep current （uA）
1.6
Maximum output power
（dBm）
12
13
13
Receiving sensitivity （dBm）
-
-119
-
-2Kbps
Air speed （bps）
2K
2K
25K
Multi-level adjustable
main parameters
describe
Remark
Reference distance
2.5km
Send length
58 Byte
Maximum transmission bytes in a single
time
Cache capacity
80Byte
Software actual debugging
Modulation
FSK
Communication Interface
UART
8N1\8E1\EO1,1200~38400Multi-level
adjustable
Encapsulation
SMD
Interface
1.27
Size
16*26
Actual layout
Antenna Interface
IPEX/Stamp hole
Equivalent impedance is about 50Ω
Name
Modul
Remark
RF crystal oscillator
(MHz)
--
16M（Built-in load
capacitance ）

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
6
3. Mechanical properties
No.
Name
Direction
Function
1
GND
-
Module ground
2
GND
-
Module ground
3
GND
-
Module ground
4
GND
-
Module ground
5
M0
Input (very weak
pull-up)
Cooperate with M1 to determine the 4 working modes of the module.
(Can not be suspended, if not used, it can be grounded)
6
M1
Input (very weak
pull-up)
Cooperate with M0 to determine the 4 working modes of the module.
(Can not be suspended, if not used, it can be grounded)
7
RXD
Input
TTL serial port input, connected to the external TXD output pin;
8
TXD
Output
TTL serial port output, connected to the external RXD input pin;
9
AUX
Output
Used to indicate the working status of the module; the user wakes up the
external MCU, and outputs low level during power-on self-check
initialization; (can be left floating)
10
VCC
-
Module power supply positive reference, voltage range: 3~3.6V DC
11
GND
-
Module ground
12
NC
Reserved
（OCDSCK）
13
GND
-
Module ground (GND)

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
7
14
NC
Reserved
(OCDSDA)
15
NC
Reserved
(VDD）
16
NC
Reserved
PA4
17
NC
Reserved
PA2
18
NC
Reserved
GPIO3
19
GND
-
Module ground
20
GND
-
Module ground
21
ANT
-
antenna
22
GND
-
Module ground
4. Connection diagram
No.
Brief description of the connection between the module and the single-chip microcomputer
(the above figure takes the STM8L single-chip microcomputer as an example)
1
The wireless serial port module is TTL level, please connect with TTL level MCU.
2
For some 5V microcontrollers, it may be necessary to add 4-10K pull-up resistors to the TXD and AUX pins of the
module.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
8
5. Detailed function
5.1 LDC reception
E330-400T13S module receives in LDC mode. The module is in the LDC (Low Duty Cycle) ultra-low power receiving mode
when powered on. The specific working mechanism is that the module periodically wakes up from sleep to detect the wireless
wake-up code. If there is a valid wake-up code, turn on RX Windows, otherwise, it will restart again after timeout. Go to sleep.
As shown below:
LDC cycle is software configurable
Sending mode. When the module sends data, it can automatically load the wake-up code corresponding to the LDC cycle.
Both sender and receiver need to configure the same LDC cycle.
5.2 Single point wakeup
The module has a single-point wake-up function, which can effectively suppress the problem of false wake-ups between devices
with the same frequency and different addresses; in the internal design, the module address will be configured as the SYNC address of
the hardware radio frequency chip, which is used to synchronize the receiving process and send The receiver chip will automatically
filter this data packet if it does not match the receiving synchronization word; the sender uses the short preamble + synchronization
word when sending the wake-up code;

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
9
Single point wake-up mode:
5.3 Module reset
After the module is powered on, AUX will immediately output low level, perform hardware self-check, and set the working mode
according to user parameters;During this process, AUX maintains low level, and after completion, AUX outputs high level, and starts
to work normally according to the working mode formed by the combination of M1 and M0;
Therefore, the user needs to wait for the rising edge of AUX as the starting point for the normal operation of the module.
5.4 AUX
AUX is used for wireless transmission and reception buffering instructions and self-checking instructions.
It indicates whether the module has data that has not been sent out through wireless transmission, or whether it has received
wireless data that has not been sent out through the serial port, or whether the module is in the process of initializing self-checking.
5.5 Matters needing attention
No.
AUX considerations
1
The above function 1 and function 2, output low level priority, that is: if any one of the output low level conditions is met,
AUX will output low level;
When all low-level conditions are not met, AUX outputs a high level.
2
When AUX outputs low level, it means that the module is busy, and the working mode detection will not be performed at
this time;
When the module AUX outputs high level within 1ms, the mode switching will be completed.
3
After the user switches to the new working mode, at least 2ms after the rising edge of AUX, the module will actually enter
this mode;
If AUX is always at high level, the mode switch will take effect immediately.
4
When the user enters other modes from mode 3 (sleep mode) or is in the reset process, the module will reset the user
parameters, during which AUX outputs low level.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
10
6. Operating mode
The module has four working modes, which are set by pins M1 and M0; the details are shown in the following table:
Mode（0-3）
M1
M0
Mode introduction
Remark
Send mode
（0）
0
0
The serial port is turned on, the wireless is turned on, and the
wake-up code is automatically added before sending the data
packet;
Use with mode 1
Receive mode
（1）
0
1
The serial port reception is closed, and the wireless is periodically
awakened to listen to air data. After receiving the data, open the
serial port to output data;
Use with mode 0
Configuration
mode （2）
1
0
Deep sleep mode, configuration commands can be sent through the
serial port, the serial port fixed parameters 9600, 8N, 1
Sleep mode
（3）
1
1
Module deep sleep mode, both serial port and wireless are closed
6.1 Mode switch
No
Remark
1
Users can combine high and low levels of M1 and M0 to determine the working mode of the module. Two GPIOs of
MCU can be used to control mode switching
After changing M1 and M0: If the module is idle, it can start to work according to the new mode after 1ms;
If the module has serial port data that has not been transmitted wirelessly, the new working mode can be entered after
the transmission is completed;
If the module receives wireless data and sends out data through the serial port, it must be sent to the new working mode;
Therefore, the mode switching can only be effective when AUX outputs 1, otherwise the switching will be delayed.
2
For example: the user continuously inputs a large amount of data and performs mode switching at the same time, the
switching mode operation at this time is invalid; the module will process all user data before proceeding to the new
mode detection
So the general suggestion is: check the output status of the AUX pin, wait for 2ms after outputting the high level, and
then switch.
3
When the module is switched from other modes to sleep mode, if there is data that has not yet been processed;
After the module processes these data (including receiving and sending), it can enter the sleep mode. This feature can be
used for fast sleep, thereby saving power consumption; for example: the transmitter module works in mode 0, the user
initiates serial data "12345", and then does not need to wait for the AUX pin to be idle (high level), and can directly
switch to sleep mode. And the user's main MCU will go to sleep immediately, and the module will automatically send
all user data wirelessly, and it will automatically go to sleep within 1ms.
Thereby saving MCU working time and reducing power consumption.
4
Similarly, this feature can be used in any mode switching. After the module processes the current mode event, it will
automatically enter a new mode within 1ms; thus eliminating the need for users to query AUX and achieving the
purpose of fast switching ；
For example, switching from the transmitting mode to the receiving mode; the user MCU can also go to sleep before the
mode switching, and use the external interrupt function to obtain the AUX changes, thereby performing the mode
switching.

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
11
5
This operation mode is very flexible and efficient. It is designed in accordance with the user's MCU's operating
convenience, and can reduce the workload of the entire system as much as possible, improve system efficiency, and
reduce power consumption.
6.2 Normal mode (mode 0)
Type
When M0 = 0 and M1 = 0, the module works in mode 0
Send
Before sending data, the module will automatically add a wireless wake-up code internally to wake up the receiving module in
the corresponding wake-up cycle.
Receive
The wireless receiving function of the module is turned on, and the wireless data will be output through the serial port TXD
pin after receiving the wireless data.
6.3 Receiving mode (mode 1)
Type
When M0 = 1, M1 = 0, the module works in mode 1
Send
When the LDC period is 0, data can be sent, which is equivalent to mode 0, otherwise data cannot be sent.
Receive
The module can periodically wake up to receive data, and the wake-up cycle can be configured through commands
6.4 Configuration mode (mode 2)
Type
The working parameters of the module can be configured through the serial port (M0 = 0, M1 = 1). Serial
parameters: 9600, 8N1
Send
Cannot send data wirelessly
Receive
Cannot receive data wirelessly
Configuration
Module working parameters can be set through special command format
6.5 Deep sleep mode (mode 3)
Type
Module deep sleep mode (M0 = 1, M1 = 1)

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
12
Send
Cannot send data wirelessly
Receive
Cannot receive data wirelessly
Other
All related functions of the module are closed, and the sleep mode can only be exited through the M1M0 pin
7. Register read and write control
7.1 Instruction format
In configuration mode (mode 2: M1=1, M0=0), the supported command list is as follows (when setting, only 9600, 8N1 format is
supported):
No
Instruction format
Detailed description
1
C0+ working
parameters
Send C0+5 bytes of working parameters in hexadecimal format, a total of 6 bytes, must be sent
continuously (save when power off)
2
C1+C1+C1
Three C1s are sent in hexadecimal format, and the module returns the saved parameters, which
must be sent continuously.
3
C2+Working parameters
Send C2+5 bytes in hexadecimal format. Working parameters, 6 bytes in total, must be sent
continuously (not saved after power failure)
4
C3+C3+C3
Three C3s are sent in hexadecimal format, and the module returns version information, which must
be sent continuously.
7.2 Working parameter reading
Instruction format
Detailed description
C1+C1+C1
In sleep mode (MOD=1), send a command to the module serial port (HEX format): C1 C1 C1,
The module will return the current configuration parameters, such as: C0 00 00 10 52 34.
7.3 Version number read
Instruction format
Detailed description
C3+C3+C3
In sleep mode (MOD=1), send a command to the module serial port (HEX format): C3 C3 C3,
The module will return the current configuration parameters, such as: C3 00 0X XX1 XX2 XX3 XX4 XX5;
Here, 00 0X represents the model of the module, XX1 is the version number, and XX2 XX3 XX4 XX5 refer to other features of the
module.

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
13
7.4 Reset command
Instruction format
Detailed description
C4+C4+C4
In sleep mode (MOD=1), send a command to the module serial port (HEX format): C4 C4 C4,
The module will generate a reset;
During the reset process, the module performs self-check, and AUX outputs low level. After resetting, AUX outputs high level, and the
module starts to work normally. At this point, you can switch the mode or initiate the next instruction.
7.5 Parameter setting instruction
No
Name
Describe
Remark
0
HEAD
Fixed 0xC0 or 0xC2, indicating that this frame data is a
control command
Must be 0xC0 or C2
C0: The set parameters will be saved after power-off.
C2: The set parameters will not be saved after power-off.
1
ADDH
Module address high byte (default 00H)
00H-FFH
2
ADDL
Module address low byte (default 00H)
00H-FFH
3
SPED
Speed parameters, including serial port speed and air speed
7，6：Serial port check digit
00: 8N1 (default)
01: 8O1
10: 8E1
11: 8N1 (equivalent to 00)
-------------------------------------------------
5，4，3 TTL serial port rate (bps)
000: The baud rate of the serial port is 1200
001: The serial port baud rate is 2400
010: The serial port baud rate is 4800
011: The baud rate of the serial port is 9600
(default)
100: The serial port baud rate is 19200
101: The serial port baud rate is 38400
-------------------------------------------------
2, Keep unused
-------------------------------------------------
1，0 Wireless air rate (bps)
00: The air rate is 2.0k (default)
01: The air speed is 5.0k
10: The air speed is 10.0k
11: The air speed is 25.0k
The serial port mode of the two communication parties can be different
-------------------------------------
The baud rate of the communication parties can be different
The serial port baud rate has nothing to do with wireless transmission
parameters, and does not affect the wireless transceiver characteristics.
--------------------------------------
The lower the air speed, the longer the distance, and the longer the
sending time.
The wireless transmission rate in the air must be the same for both
parties.
4
CHAN
-------------------------------------------------
7 - 0：Communication channel, default 28H (433MHz)
----------------------------------------
00H-A8H, corresponding to 410~493MHz
The corresponding frequency is:
410+CH[7:0]*05 MHz
5
OPTION
7：Fixed-point transmission enable bit (like MODBUS)
0: Transparent transmission mode (default)
1: Fixed-point transmission mode
6，Keep unused
-------------------------------------------------
5 , 4 LDC cycle
00：0ms
01：1000ms（default ）
10：2000ms
11：3000ms
-------------------------------------------------
3, Keep unused
-------------------------------------------------
2 IO drive mode (default 1)
When is 1, the first 3 bytes of each user data frame are used as high
and low addresses and channels. When transmitting, the module changes
its own address and channel, and restores the original settings after
completion -------------------------------------
The larger the LDC period, the lower the power consumption, but the
greater the receiving delay
The wake-up time set by both parties must be consistent;
-------------------------------------
After turning on the RSSI output, after the module receives the wireless
data, it automatically adds 1 byte of the inverse value of the RSSI of this
communication to the end of the data packet
That is: the inverse of the real RSSI value = the valu of the serial port
output e
-------------------------------------
This bit is used to enable the internal pull-up resistor of the module. The
open-drain method has stronger level adaptability, and in some cases, an
external pull-up resistor may be required
----------------------------------------
The greater the output power of the transmitter, the greater the
communication distance and the corresponding transmission power

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
14
1: TXD, AUX push-pull output, RXD pull-up
input
0: TXD, AUX open circuit output, RXD open
circuit input -------------------------------------------------
1, 0 Transmitting power (approximate value)
00: 13dBm (default) 01 ：
10dBm
10：7dBm
11：4dBm
consumption.
For example (the meaning of the “SPED” byte of sequence number 3):
The binary bits of the byte
7
6
5
4
3
2
1
0
Specific value (user configuration)
0
0
0
1
1
0
0
0
Representative meaning
Serial port parity 8N1
The serial port baud rate is 9600
The air speed is 1.2k
Corresponding hexadecimal
1
8
7.6 Factory default parameters
Type
Factory default parameter value: C0 00 00 10 52 34
Module model
Frequency
Address
Channel
Air speed
Baud rate
Serial format
Transmit
power
E330-400T13S
433MHz
0x0000
46
2.0Kbps
9600
8N1
13dBm
When the factory settings are restored, the module wake-up time is 1000ms, and the reception will have a delay of about 1.2S 。

Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
15
8. Host computer configuration instructions
The following figure shows the display interface of the E330-400T13S configuration host computer. The user can switch to the
command mode through M0 and M1, and quickly configure and read the parameters on the host computer.
In the configuration of the upper computer, the module address, frequency channel, network ID, and key are all displayed in decimal
mode; the value range of each parameter:
Baud rate: 1200~38400
Network address: 0～65535
Frequency channel: 0～166
When using the host computer to configure the relay mode, the user needs to pay special attention. Since each parameter in the host
computer is in the decimal display mode, the module address needs to be converted by conversion.
9. Hardware design
It is recommended to use a DC stabilized power supply to supply power to the module, and the power ripple coefficient should
be as small as possible, and the module must 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 that it is within the recommended power supply voltage. If it exceeds the maximum
value, it will cause permanent damage to the module;
Please check the stability of the power supply, and the voltage should not fluctuate greatly and frequently;
When designing the power supply circuit for the module, it is often recommended to reserve more than 30% margin, and the
whole machine is conducive to long-term stable operation;
The module should be as far away as possible from the power supply, transformer, high-frequency wiring and other parts with

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
16
large electromagnetic interference;
High-frequency digital wiring, high-frequency analog wiring, and power wiring must avoid the bottom of the module. If it is
necessary to pass under the module, assuming that the module is soldered to the Top Layer, lay copper on the Top Layer of the
contact part of the module (all copper And well grounded), it must be close to the digital part of the module and routed in the
Bottom Layer;
Assuming that the module is soldered or placed on the Top Layer, it is also wrong to randomly route the wires on the Bottom
Layer or other layers, which will affect the stray and receiving sensitivity of the module to varying degrees;
Assuming that there are devices with large electromagnetic interference around the module, it will greatly affect the
performance of the module. According to the intensity of the interference, it is recommended to stay away from the module. If
the situation permits, proper isolation and shielding can be done;
Assuming that there are traces with large electromagnetic interference around the module (high-frequency digital,
high-frequency analog, power wiring) will greatly affect the performance of the module, according to the intensity of the
interference, it is recommended to stay away from the module, if the situation permits Appropriate isolation and shielding;
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 part of the physical layer that is also 2.4GHz TTL protocol, such as: USB3.0;
The antenna installation structure has a great impact on the performance of the module. Make sure that the antenna is exposed
and it is best to be vertically upward;
When the module is installed inside the case, a high-quality antenna extension cable can be used to extend the antenna to the
outside of the case;
The antenna must not be installed inside the metal shell, which will greatly reduce the transmission distance.
10. Common problems
10.1 Transmission distance is not ideal
When there is a straight line communication obstacle, the communication distance will be attenuated accordingly;
Temperature, humidity, and co-frequency interference will increase the communication packet loss rate;
The ground absorbs and reflects radio waves, and the test effect is poor when it is close to the ground;
Sea water has a strong ability to absorb radio waves, so the seaside test effect is poor;
If there are metal objects near the antenna or placed in a metal shell, the signal attenuation will be very serious;
The power register is set incorrectly, and the air rate is set too high (the higher the air rate, the closer the distance);
The low voltage of the power supply at room temperature is lower than the recommended value, and the lower the voltage, the
lower the power output;
The matching degree of the antenna and the module is poor or the quality of the antenna itself is problematic
10.2 Module is easily damaged
Please check the power supply to ensure that it is within the recommended power supply voltage. If it exceeds the maximum
value, it will cause permanent damage to the module;
Please check the stability of the power supply, and the voltage should not fluctuate significantly and frequently;
Please ensure that the installation and use process is anti-static, and high-frequency components are electrostatically sensitive;
Please ensure that the humidity should not be too high during installation and use, and some components are humidity

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
17
sensitive devices;
If there is no special requirement, it is not recommended to use it at too high or too low temperature.
10.3 Bit error rate is too high
There is co-frequency signal interference nearby, stay away from the interference source or modify the frequency and channel
to avoid interference;
Unsatisfactory power supply may also cause garbled codes. Be sure to ensure the reliability of the power supply;
Poor or too long extension cables and feeders can also cause high bit error rates.
11. Welding operation guidance
This product is a SMD module. When soldering the module, the soldering personnel must work in accordance with the anti-static
operation specification;
This product is an electrostatic sensitive product. If the module is not welded in accordance with the specification, it may cause
permanent damage to the module.
12. Antenna Guide
12.1 Antenna recommendation
Antennas are an important role in the communication process, and often inferior antennas will have a great impact on the
communication system. Therefore, our company recommends some antennas as supporting our company’s wireless modules with
excellent performance and reasonable prices.
SKU
Type
Frequency
Hz
Interface
增益
dBi
高度
mm
馈线
cm
功能特点
TX433-NP-431
0
Flexible
antenna
433M
welding
2.0
43.8*9.5
-
Built-in flexible, FPC soft
antenna
TX433-JZ-5
Rubber rod
antenna
433M
SMA-J
2.0
52
-
Ultra-short straight,
omnidirectional antenna
TX433-JZG-6
Rubber rod
antenna
433M
SMA-J
2.5
62
-
Ultra-short straight,
omnidirectional antenna
TX433-JW-5
Rubber rod
antenna
433M
SMA-J
2.0
50
-
Bend Rubber rod antenna,
omni antenna
TX433-JWG-7
Rubber rod
antenna
433M
SMA-J
2.5
75
-
Bend Rubber rod antenna,
omni antenna
TX433-JK-11
Rubber rod
antenna
433M
SMA-J
2.5
110
-
Bend Rubber rod antenna,
omni antenna
TX433-JK-20
Rubber rod
antenna
433M
SMA-J
3.0
210
-
Bend Rubber rod antenna,
omni antenna
TX433-XPL-10
0
Sucker
antenna
433M
SMA-J
3.5
185
100
Small Sucker antenna
TX433-XP-200
Sucker
433M
SMA-J
4.0
190
200
Middle Sucker antenna

Chengdu Ebyte Electronic Technology Co.,Ltd. E330-400T13S User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
18
antenna
low loss
TX433-XPH-30
0
Sucker
antenna
433M
SMA-J
6.0
965
300
Big Sucker antenna，
High gain
TX490-JZ-5
Sucker
antenna
470/490M
SMA-J
2.0
50
-
Ultra-short straight,
omnidirectional antenna
TX490-XPL-10
0
Sucker
antenna
470/490M
SMA-J
3.5
120
100
Small Sucker antenna
Revise history
Version
Revision date
Revision description
Maintenance man
1.0
2021-8-23
initial version
Linson
13. About us
Technical support: [e-mail]
Documents and RF Setting download link:：www.ebyte.com
Thank you for using Ebyte products! Please contact us with any questions or suggestions: [e-mail]
-------------------------------------------------------------------------------------------------
Official hotline: [phone] ext. 821
Web: www.ebyte.com
Address: Innovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China