Ebyte E220-230T30S User manual

E220-230T30S User Manual
220/236MHz 30dBm New LoRa Wireless Module

Contents
Disclaimer...............................................................................................................................................................................3
1. Overview.............................................................................................................................................................................4
1.1 Introduction...............................................................................................................................................................4
1.2 Features.....................................................................................................................................................................4
1.3 Application................................................................................................................................................................4
2. Specification and parameter................................................................................................................................................5
2.1 Limit parameter.........................................................................................................................................................5
2.2 Operating parameter................................................................................................................................................. 5
3 Size and pin definition......................................................................................................................................................... 6
4. Connect to MCU.................................................................................................................................................................8
5. Operating mode...................................................................................................................................................................8
5.1 Mode switching.........................................................................................................................................................8
5.2 Normal mode（Mode 0）........................................................................................................................................ 9
5.3 WOR transmitting mode（Mode 1）.......................................................................................................................9
5.4 WOR receiving mode（Mode 2）......................................................................................................................... 10
5.5 Deep sleep mode（Mode 3）.................................................................................................................................10
6. Function description......................................................................................................................................................... 11
6.1 Fixed transmission.................................................................................................................................................. 11
6.2 Broadcasting transmission...................................................................................................................................... 11
6.3 Broadcasting address.............................................................................................................................................. 11
6.4 Monitor address...................................................................................................................................................... 12
6.5 Reset........................................................................................................................................................................12
6.6 AUX description..................................................................................................................................................... 12
6.6.1 Indication of UART output..........................................................................................................................12
6.6.2 Indication of wireless transmitting.............................................................................................................. 12
6.6.3 Configuration procedure of module.............................................................................................................13
6.6.4 Notes for AUX.............................................................................................................................................13
7. Register read and write control.........................................................................................................................................14
7.1 Command format.................................................................................................................................................... 14
7.2 Register description................................................................................................................................................ 15
7.3 Factory default parameter....................................................................................................................................... 17
8 Configuration instructions on computer............................................................................................................................ 17
9 Hardware design................................................................................................................................................................ 18
10 FAQ................................................................................................................................................................................. 19
10.1 Communication range is too short........................................................................................................................ 19
10.2 Module is easy to damage.....................................................................................................................................19
10.3 BER(Bit Error Rate) is high...............................................................................................................................20
11 Production guidance........................................................................................................................................................ 20
11.1 Reflow soldering temperature...............................................................................................................................20
11.2 Reflow soldering curve.........................................................................................................................................21
12 E220 series.......................................................................................................................................................................21
13 Antenna recommendation................................................................................................................................................ 21

Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T30S User manual
14 Package for batch order................................................................................................................................................... 22
Revision history.................................................................................................................................................................... 22
About us................................................................................................................................................................................23

Disclaimer
The information in this document, including the URL address for reference, is subject to change without notice.
The document is provided "as is" without any guarantee responsibility, including any guarantee for marketability,
suitability for a specific purpose, or non-infringement, and any guarantee for any proposal, specification or sample
mentioned elsewhere. This document does not bear any responsibility, including the responsibility for infringement
of any patent rights caused by the use of the information in this document. This document does not grant any
license for the use of intellectual property rights in estoppel or other ways, whether express or implied.
The test data obtained in the article are all obtained by the Ebyte laboratory, and the actual results may vary
slightly.
We hereby declared that all brand names, trademarks and registered trademarks mentioned in this document
are the property of their respective owners.
The final interpretation right belongs to Chengdu Ebyte Electronic Technology Co., Ltd.
Notice :
Due to product version upgrades or other reasons, the contents of this manual may be changed. Ebyte Electronic
Technology Co., Ltd. reserves the right to modify the contents of this manual without any hint or noticet. This manual is
only used as a guide. Chengdu Ebyte Electronic Technology Co., Ltd. makes every effort to provide accurate information
in this manual. However, we does not guarantee that the contents of the manual are completely free of errors. All
statements, information and suggestions in this manual do not constitute any express or implied guarantee.

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1. Overview
1.1 Introduction
E220-230T30S is a new generation of Lora wireless serial port module
(UART) based on SEMTECH's LLCC68, working at 220.125 ～236.125MHz
(default 230.125MHz), with TTL level output, compatible with 3.3V and 5V IO
port voltage.
Compared with the traditional SX1278 solution, it has a longer transmission
distance, faster speed, lower power consumption; it supports functions such as air
wake-up, carrier sense, communication keys and sub-package length setting. Ebyte provides customized development
services on it. It is a cost-effective solution, which covers the frequency band of 220 ~ 236MHz.
1.2 Features
LLCC68 LoRa chip has the advantage of low power consumption, fast speed and long distance;
In ideal condition, communication distance reach up to 10 km；
Maximum transmission power of 30dBm, software multi-level adjustable；
The communication allows users to set key that cannot be read, greatly improving the user data privacy;
Supports RSSI for evaluating signal quality, improving communication network, and ranging;
Support air wake-up, that is, ultra-low power consumption function, suitable for a battery-powered application
solutions;
Supports fixed transmission, radio transmission, channel to monitor;
Parameters automatically saved when power off, it will work according to previous parameters once powered on.
Effective watchdog design, once an exception occurs, the module will be in automatic restart, and can continue to
work on previous parameter;
Supports air date rate of 2.4kbps～62.5kbps；
Supports 2.3V~5.5V power supply, power supply over 5.0 V can guarantee the best performance；
Industrial grade standard design, support -40 ~ 85 °C for working over a long time；
Dual antenna (IPEX and stamp hole) optional, good for secondary development and integration.
1.3 Application
Home security alarm and remote keyless entry；
Smart home and industrial sensors；
Wireless alarm security system；
Building automation solutions；

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Wireless industrial-grade remote control；
Health care products；
Advanced Meter Reading Architecture(AMI)；
Automotive industry applications.
2. Specification and parameter
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply（V）
0
5.5
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
/
2.2 Operating parameter
Main parameter
Performance
Remark
Min.
Typ.
Max.
Operating voltage（V）
3.0
5.0
5.5
≥5.0 V ensures output power
Communication level（V）
3.3
For 5V TTL, it may be at risk of burning
down
Operating temperature（℃）
-40
-
85
Industrial design
Operating frequency（MHz）
220.125
-
236.125
Support ISM band
Power
consumpti
on
TX current（mA）
610
Instant power consumption
RX current（mA）
17
Sleep current （μA）
3
Software is shut down@30dBm
Max Tx power（dBm）
29.5
30.0
30.5
Receiving sensitivity（dBm）
-
-129
-
-124dbm,BW_L=125kHz,SF =
7,LORATM;
-129dbm,BW_L=125kHz,SF =
9,LORATM;
-121dbm,BW_L=250kHz,SF =
7,LORATM;
-129dbm,BW_L=250kHz,SF =
10,LORATM;
-117dbm,BW_L=500kHz,SF =
7,LORATM;
-127dbm,BW_L=500kHz,SF =
11,LORATM;
Air data rate（bps）
2.4k
2.4k
62.5k
Controlled via user’s programming

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Main parameter
Description
Remark
Distance for reference
10km
Test condition：clear and open area, antenna gain: 5dBi，
antenna height: 2.5m，air data rate: 2.4kbps
TX length
200 Byte
Can be configured via command as 32/64/128/240 bytes
per packet to transmit
Buffer
400 Byte
Modulation
LoRa
New generation LoRa modulation technology
Communication interface
UART Serial Port
TTL level
Package
SMD
Connector
IPEX/stamp hole
Spacing 2.54mm
Size
25*40.5 mm
Antenna
IPEX/stamp hole
50 ohm impedance
3 Size and pin definition

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Pin No.
Pin Name
Pin Direction
Pin Function
1
GND
Input
Module ground
2
VCC
Input
Voltage range: 3.0～5.5V DC
3
AUX
Output
Used to indicate the working status of the module; wakes up the external
MCU, and outputs low level during power-on self-check initialization; (can be
left floating)
4
TXD
Output
TTL UART outputs, connects to external RXD input pin.
5
RXD
Input
TTL UART inputs, connects to external TXD output pin.
6
M1
Input
（weak pull-up）
Work with M0 to decide 4 working modes of module (not float, if not used,
could be grounded).
7
M0
Input
（weak pull-up）
Work with M1 to decide 4 working modes of module (not float, if not used,
could be grounded).
11
ANT
Output
Antenna interface (high frequency signal output, 50 ohm impedance)
12
GND
Fixed ground
13
GND
Fixed ground
14
GND
Fixed ground
18
NC
Input/Output
NC pin, this pin needs to be left floating (for subsequent expansion)
19
NC
Input/Output
NC pin, this pin needs to be left floating (for subsequent expansion)
20
NC
Input/Output
NC pin, this pin needs to be left floating (for subsequent expansion)
21
NC
Input
(Users do not need to connect, to be left floating)
22
NC
Input
(Users do not need to connect, to be left floating)
23
GND
Input
Fixed ground
24
NC
Input
(Users do not need to connect, to be left floating)

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4. Connect to MCU
No.
Brief description of the connection between the module and the MCU (the above figure uses the STM8L MCU
as an example)
1
The UART module is TTL level, please connect with TTL level MCU.
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
5. Operating mode
There are four operating modes, which are set by M1 and M0, the details are as follows:
Mode(0-3)
M1
M0
Description
Remark
0 Normal mode
0
0
UART and wireless channel are open, transparent transmission
is on
-
1 WOR transmitting
mode
0
1
Can be defined as WOR transmitter and WOR receiver
Supports wake up over air
2 WOR receiving
mode
1
0
Only work as WOR receiver
-
3 Deep sleep mode
1
1
For parameter configuration
-
5.1 Mode switching
No.
Remark

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1
Users can combine M1 and M0 with high and low levels to determine the operating mode. Two GPIOs of the MCU can
be used to control mode switching;
After changing M1 and M0: If the module is idle, after 1ms, it can start working according to the new mode;
If the serial port data of the module has not been transmitted through the wireless, the new working mode can be
switched after the transmission is completed;
If the module receives the wireless data and transmits the data through the serial port, it needs to finish transmission
before switching the new working mode;
Therefore, mode switching can only be valid when AUX output is 1, otherwise it will delay switching.
2
For example, users continuously inputs a large amount of data and simultaneously performs mode switching. At this
time, the switching mode operation is invalid; the module will process all the user data before performing the new mode
detection;
Therefore, the general recommendation is to detect the output state of the AUX pin and switch after 2ms when the
output is high.
3
When the module is switched from other modes to sleep mode, if the data has not been processed yet;
The module will process these data (including receiving and sending) before entering sleep mode. This feature can be
used for fast sleep, which saves power; for example, the transmitter module works in mode 0, the user transmits the
serial port data "12345", and then does not have to wait for the AUX pin to be idle (high level), and can directly switch
to sleep mode. And the user's main MCU immediately sleeps, the module will automatically transmit the user data
through the wireless, and automatically enters sleep within 1ms;
This saves MCU's working time and reduces power consumption.
4
Similarly, any mode switching can use this feature. After the module processes the current mode event, it will
automatically enter the new mode within 1ms; thus eliminating the need for the user to query AUX and achieve 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.
5
This operation mode 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.
5.2 Normal mode（Mode 0）
Type
M0 = 0，M1 = 0
Transmitting
Users can input data through the serial port and the module will start wireless transmission.
Receiving
The module wireless receiving function is turned on, and after receiving the wireless data, it will be output through the serial
port TXD pin.
5.3 WOR transmitting mode（Mode 1）
Type
M0 = 1，M1 =0

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Transmitting
Wireless data transmitting is enabled
Receiving
Wireless data receiving is enabled
5.4 WOR receiving mode（Mode 2）
Type
M0 = 0，M1 = 1
Transmitting
Wireless transmitting off
Receiving
Wireless receiving on
5.5 Deep sleep mode（Mode 3）
Type
M0 = 1，M1 = 1
Transmitting
Unable to transmit wireless data
Receiving
Unable to receive wireless data
Configuration
Users can access the registers to configure the module's operation state.
Note
When from the sleep mode to other modes, the module will reconfigure the parameters. During the configuration process,
AUX will remain low; After configuration, it outputs high level, we suggest that user test rising edge T_BUSY.

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6. Function description
6.1 Fixed transmission
6.2 Broadcasting transmission
6.3 Broadcasting address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
When module is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the purpose of

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broadcast is realized.
6.4 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.
6.5 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.
6.6 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.
6.6.1 Indication of UART output
To wake up external MCU
6.6.2 Indication of wireless transmitting
Buffer (empty): the internal 400 bytes data in the buffer are written to the RFIC (Auto sub-packaging);
When AUX=1, the user can input data less than 400 bytes continuously without overflow.
When AUX=0, Buffer (not empty): the internal 400 bytes data in the buffer have not been written to the RFIC completely. If the

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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.
Notcie: 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.
6.6.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode
6.6.4 Notes for AUX
No.
Description
1
For function 1 & function 2 mentioned above, the priority should be given to the one with low level output, which means if it
meets each of any low level output condition, AUX outputs low level, if none of the low level condition is met, AUX outputs
high level.
2
When AUX outputs low level, it means the module is busy & cannot conduct operating mode checking. Within 1ms since AUX
outputs high level, the mode switch will be completed.
3
After switching to new operating mode, it will not work in the new mode immediately until AUX rising edge lasts for 2ms . If
AUX stays on the high level, the operating mode switch can be effected immediately.

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4
When the user switches to other operating modes from mode 3 (sleep mode) or it’s still in reset process, the module will reset
user parameters, during which AUX outputs low level.
5
Due to the characteristics of the LoRa modulation method, the information transmission delay is much longer than that of FSK.
For example, at 2.4kbps airspeed, the 100-byte transmission delay is about 1.5 seconds. It is recommended that customers do not
transmit large amounts of data at low airspeeds, so as to avoid communication abnormalities caused by data loss due to data
accumulation.
7. Register read and write control
7.1 Command format
In configuration mode (mode 3: M1 = 1, M0 = 1), the list of supported commands are as follows (only 9600, 8N1 format is
supported when)：
No.
Command format
Description
1
Set register
Command: C0+starting address+length+parameters
Response: C1+starting address+length+parameters
E.g 1: Channel is 0x09
command starting address length parameter
Send: C0 05 01 09
Returen: C1 05 01 09
E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate
(2.4K).
Send: C0 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
2
Read register
Command: C1+starting address+ length
Response: C1+starting address+length+parameters
E.g 1：Read channel
command starting address length parameter
Send: C1 05 01
Returen: C1 05 01 09
E.g 2: Read module address, network address, serial port and air data rate.
Send: C1 00 04
Return: C1 00 04 12 34 00 61
3
Set temporary
registers
Command: C2+starting address+parameters
Response: C1+starting address+length+parameters
E.g 1: Channel is 0x09
command starting address length parameter
Send: C2 05 01 09
Returen: C1 05 01 09
E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate
(2.4K).
Send: C2 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
5
Wireless
configuration
Command: CF CF + normal command
Respond：CF CF + normal respond

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E.g 1: Channel is 0x09
Command head command starting address length parameter
Send: CF CF C0 05 01 09
Returen: CF CF C1 05 01 09
E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air data rate
(2.4K).
Send: CF CF C2 00 04 12 34 00 61
Return: CF CF C1 00 04 12 34 00 61
6
Wrong format
Wrong format respond: FF FF FF
7.2 Register description
Address
Read
or
Write
Name
Description
Remark
00H
Read/
Write
ADDH
ADDH（default 0）
High byte and low byte of module address;
Note: When the module address is equal to FFFF,
it can be used as the broadcast and monitor
address, that is: the module will not perform
address filtering at this time
01H
Read/
Write
ADDL
ADDL（default 0）
02H
Read/
Write
REG0
7
6
5
UART Serial Port Rate（bps）
For the two modules that communicate with each
other, the serial port baud rate can be different,
and the verification method can also be different;
When continuously transmitting large data
packets, users need to consider the data
congestion caused by the same baud rate, and may
even be lost;
It is generally recommended that the baud rate of
the two communication parties be the same.
0
0
0
UART Rate is 1200
0
0
1
UART Rate is 2400
0
1
0
UART Rate is 4800
0
1
1
UART Rate is 9600（default）
1
0
0
UART Rate is 19200
1
0
1
UART Rate is 38400
1
1
0
UART Rate is 57600
1
1
1
UART Rate is 115200
4
3
Serial Parity Bit
The serial port mode of the communication parties
can be different;
0
0
8N1（default）
0
1
8O1
1
0
8E1
1
1
8N1（equal to 00）
2
1
0
Air Data Rate（bps）
The air rate of both parties must be the same;
The higher the air rate, the smaller the delay and
the shorter the transmission distance.
0
0
0
Air Data Rate 2.4k
0
0
1
Air Data Rate 2.4k
0
1
0
Air Data Rate 2.4k（default）
0
1
1
Air Data Rate 4.8k
1
0
0
Air Data Rate 9.6k
1
0
1
Air Data Rate 19.2k
1
1
0
Air Data Rate 38.4k

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1
1
1
Air Data Rate 62.5k
03H
Read/
Write
REG1
7
6
Sub-Packet Setting
The data sent by the user is less than the
sub-packet length, and the serial port output of the
receiving end appears as an uninterrupted
continuous output;
The data sent by the user is larger than the packet
length, and the serial port of the receiving end will
be output in packets.
0
0
200 bytes（default）
0
1
128 bytes
1
0
64 bytes
1
1
32 bytes
5
RSSI Ambient noise enable
Enable command (packet setting, transmit power
are default parameters, configuration mode):
C0 03 01 20;
After enabling, you can send commands C0 C1
C2 C3 in transmission mode or WOR sending
mode to read registers;
Register 0x00: Current environmental noise RSSI;
Register 0x01: RSSI when receiving data last time
(The current channel noise is:
dBm = -（256 - RSSI）);
Command format: C0 C1 C2 C3 + starting
address + read length
Return: C1 + address + read length + read valid
value;
for example: Send C0 C1 C2 C3 00 01
Return C1 00 01 RSSI (address can only start
from 00)
0
Disable（Default）
1
Enable
4
3
2
Reserve
1
0
Transmitting Power
The relationship between power and current is
non-linear, and the power supply has the highest
efficiency at maximum power;
The current will not decrease in the same
proportion as the power decreases.
0
0
30dBm（default）
0
1
27dBm
1
0
24dBm
1
1
21dBm
04H
Read/
Write
REG2
Channel Control（CH）
0-63 represents a total of 64 channels
Actual frequency = 220.125 + CH *0.25M
05H
Read/
Write
REG3
7
Enable RSSI Byte
After being enabled, the module receives wireless
data and outputs it through the serial port TXD,
followed by an RSSI strength byte.
0
Disable（Default）
1
Enable
6
Transmission Method
During fixed transmission, the module will
recognize the first three bytes of serial data as:
address high + address low + channel, and use it
as a wireless transmission target.
0
Transparent transmission mode（default）
1
Fixed transmission mode
5
Reserve
4
LBT Enable
After enabling, monitoring will be conducted
before wireless data transmission, which can
avoid interference to a certain extent, but may
cause data delay;
The maximum stay time of LBT is 2 seconds, and
it will be issued forcibly when it reaches 2
seconds.
0
Disable（default）
1
Enable
3
Reserve
2
1
0
WOR Cycle
Only valid for mode 1;
Cycle T= (1+WOR)*500ms, the maximum is
0
0
0
500ms

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4000ms, the minimum is 500ms;
The longer the WOR monitoring interval period,
the lower the average power consumption, but the
greater the data delay;
Both sender and receiver must agree (very
important)
0
0
1
1000ms
0
1
0
1500ms
0
1
1
2000ms
1
0
0
2500ms
1
0
1
3000ms
1
1
0
3500ms
1
1
1
4000ms
06H
Write
CRYPT
_H
Key high byte（default 0）
Write only, read returns 0;
Used for encryption to avoid interception of
wireless data in the air by similar modules;
The module will use these two bytes as a
calculation factor to transform and encrypt the air
wireless signal.
07H
Write
CRYPT
_L
Key low byte（default 0）
7.3 Factory default parameter
Factory default parameters：C0 00 00 62 00 00
Model No.
Frequency
Address
Channel
Air data rate
Baud rate
Parity format
Power
E220-230T30S
230.125MHz
0x0000
0x17
2.4kbps
9600
8N1
30dbm
8. Configuration instructions on computer
The following figure shows the E220-230T30S configuration host computer display interface, the user can switch to the
command mode through M0,M1, and quickly configure and read the parameters on computer.

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In the configuration on computer, the module address, frequency channel, network ID, and key are all in decimal mode. The
range of values of each parameter is:
Network address: 0-65535
Frequency channel: 0-64
Key: 0-65535
9. 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；

Chengdu Ebyte Electronic Technology Co., Ltd. E22-400T30S User Manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd.
19
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.
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).
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.
10.2 Module is easy to damage
Please check the power supply source, ensure it is in right range, voltage higher than max value 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.