Ebyte E220-900T22S User manual

E220-900T22S User Manual
868/915MHz 22dBm New Generation LoRa Wireless Module

Chengdu Ebyte Electronic Technology Co., Ltd. E220-900T22S User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co., Ltd.
1
Contents
1. Overview.............................................................................................................................................................................3
1.1 Introduction...............................................................................................................................................................4
1.2 Features.....................................................................................................................................................................4
1.3 Application................................................................................................................................................................4
2. Specifications and Parameters............................................................................................................................................ 5
2.1 Limit parameter.........................................................................................................................................................5
2.2 Operating parameter................................................................................................................................................. 5
3. Size and Pin Definition....................................................................................................................................................... 6
4. Connect to MCU.................................................................................................................................................................8
5. Function Description...........................................................................................................................................................9
5.1 Fixed Transmission...................................................................................................................................................9
5.2 Broadcasting Transmission.......................................................................................................................................9
5.3 Broadcasting address.............................................................................................................................................. 10
5.4 Monitor address...................................................................................................................................................... 10
5.5 Reset........................................................................................................................................................................10
5.6 AUX description..................................................................................................................................................... 10
5.6.1 Indication of UART output..........................................................................................................................10
To wake up the external MCU..............................................................................................................................10
5.6.2 Indication of wireless transmitting.............................................................................................................. 10
5.6.3 Configuration procedure of module.............................................................................................................11
5.6.4 Notes for AUX.............................................................................................................................................11
6. Operating Mode................................................................................................................................................................ 12
6.1 Mode Switching......................................................................................................................................................12
6.2 Normal mode（Mode 0）...................................................................................................................................... 13
6.3 WOR sending mode (Mode 1)................................................................................................................................13
6.4 WOR receiving mode (Mode 2)............................................................................................................................. 13
6.5 Deep Sleep Mode (Mode 3)....................................................................................................................................13
7. Register Read and Write Control......................................................................................................................................14
7.1 Command Format................................................................................................................................................... 14
7.2 Register Description............................................................................................................................................... 14
7.3 Factory Default Parameter...................................................................................................................................... 16
8. Configuration Instruction 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.................................................................................................................................19
11. Soldering Operation Guidance........................................................................................................................................20
11.1 Reflow Soldering Temperature.............................................................................................................................20
11.2 Reflow Soldering Curve....................................................................................................................................... 20
12. Related Models............................................................................................................................................................... 21
13. Antenna Recommendation..............................................................................................................................................21

Chengdu Ebyte Electronic Technology Co., Ltd. E220-900T22S User Manual
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14. Package for Bulk Order.................................................................................................................................................. 22
Revision History................................................................................................................................................................... 22
About us................................................................................................................................................................................22

Chengdu Ebyte Electronic Technology Co., Ltd. E220-900T22S User Manual
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Disclaimer and copyright notice
The information in this article, including the URL for reference, is subject to change
without notice. The document is provided "as is" without warranty of any kind, including
any warranty of merchantability, fitness for a particular purpose or non-infringement, and
any warranty of any proposal, specification or sample referred to elsewhere. This document
does not bear any liability, including any infringement of any patent rights resulting from
the use of the information contained in this document. No estoppel or other license, express
or implied, is granted herein for the use of intellectual property.
All the test data obtained in this paper are obtained by E-Baite laboratory, and the actual
results may be slightly different.
It is hereby declared that all trade names, trade marks and registered trade marks
mentioned herein are the property of their respective owners.
The right of final interpretation belongs to Chengdu Yibaite Electronic Technology Co.,
LTD.
The attention
The contents of this manual may change due to product version upgrade or other reasons. E-baite
Electronic Technology Co., Ltd. reserves the right to modify the contents of this manual
without any notice or prompt. This manual is only used as a guide, and Chengdu Yibaite
Electronic Technology Co., Ltd. makes every effort to provide accurate information in this
manual, but Chengdu Yibaite Electronic Technology Co., Ltd. does not guarantee that the
content of this manual is completely free of errors, and all statements, information and
Suggestions in this manual do not constitute any express or implied warranty.

Chengdu Ebyte Electronic Technology Co., Ltd. E220-900T22S User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co., Ltd.
4
1. Overview
1.1 Introduction
E220-900T22S is a new generation of LoRa wireless serial port module (UART), based on
Semtech's original LLCC68 chip design. It has a variety of transmission methods, works in
the (850.125～930.125MHz) frequency band (default 873.125MHz), LoRa spread spectrum
technology, TTL level output, compatible with 3.3V and 5V IO port voltage.
E220-900T22S adopts a new generation of LoRa solution. Compared with the traditional
SX1276 solution, the transmission distance is longer, the speed is faster, and the power
consumption is lower; it supports functions such as air wake-up, carrier monitoring, and
communication key, and supports sub-packet length setting. Ebyte can provide customized
development services. Compared with the LLCC68 scheme, this scheme has a high cost
performance advantage. The product can cover an ultra-wide frequency range of 850～930MHz.
1.2 Features
Using LLCC68 chip solution, it has significant advantages of low power consumption, fast speed and long distance;
Under ideal conditions, the communication distance can reach 5 km;
The maximum transmit power is 22 dBm, and the software is multi-level adjustable;
Support users to set the communication key by themselves, and it cannot be read, which greatly improves the confidentiality of
user data;
Support RSSI signal strength indicator function for evaluating signal quality, improving communication network, and ranging;
Support air wakeup, that is, ultra-low power consumption function, suitable for battery-powered applications;
Support fixed-point transmission, broadcast transmission, channel monitoring;
Support the global ISM 868/915MHz frequency band;
The parameters are saved after power off, and the module will work according to the set parameters after power on again;
Efficient watchdog design. Once an exception occurs, the module will automatically restart and continue to work according to
the previous parameter settings;
Support the data transmission rate of 2.4k～62.5kbps;
Support 2.3~5.5V power supply, power supply greater than 5V can guarantee the best performance;
Industrial standard design, supporting long-term use at -40～+85℃;
Dual antennas are optional (IPEX/stamp hole), which is convenient for users to develop and integrate.
1.3 Application
Home security alarm and remote keyless entry；
Smart home and industrial sensors；
Wireless alarm security system；
Building automation solutions；
Wireless industrial-grade remote control；
Health care products；
Advanced Meter Reading Architecture(AMI)；
Automotive industry applications.

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2. Specifications and Parameters
2.1 Limit parameter
Main parameter
Performance
Remark
Min.
Max.
Power supply（V）
2.3
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.
Typ.
Max.
Operating voltage（V）
3.3
5.0
5.5
≥5.0 V ensures output power
Communication level（V）
-
3.3
-
For 5V TTL, it may be at risk of burning down
Operating temperature（℃）
-40
-
85
Industrial design
Operating frequency（MHz）
850.125
-
930.125
Support ISM band
Power
consum
ption
TX current（mA）
-
110
-
Instant power consumption @22dBm
RX current（mA）
-
11
-
-
Sleep current （μA）
-
2
-
Software is shut down
Max Tx power（dBm）
21.5
22.0
22.5
-
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
Distance for reference
5km
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 32/64/128/200
bytes per packet to transmit
Buffer
400 Byte
-
Modulation
LoRa
New generation LoRa modulation technology
Communication interface
UART
TTL Level
Package
SMD
-
Connector
1.27mm
Stamp hole
Size
16*26 mm
-
Antenna
IPEX/stamp hole
50 ohm impedance

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3. Size and Pin Definition

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No.
Name
Direction
Features
1
GND
-
Ground
2
GND
-
Ground
3
GND
-
Ground
4
GND
-
Ground
5
M0
Input
（weak pull-up）
Work with M1 to decide 4 working modes of module (not suspended, if not
used, could be grounded).
6
M1
Input
（weak pull-up）
Work with M0 to decide 4 working modes of module (not suspended, if not
used, could be grounded).
7
RXD
Input
TTL UART inputs, connects to external (MCU, PC) TXD output pin.
8
TXD
Output
TTL UART outputs, connects to external RXD (MCU, PC) 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
-
Power supply: 2.3~ 5.2V DC
11
GND
-
Ground
12
NC
-
Empty Pin
13
GND
-
Ground
14
NC
-
Empty Pin
15
NC
-
Empty Pin
16
NC
-
Empty Pin
17
NC
-
Empty Pin
18
NC
-
Empty Pin
19
GND
-
Ground
20
GND
-
Ground
21
ANT
-
Antenna
22
GND
-
Ground

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4. Connect to MCU
No.
Brief description of the connection between the module and the MCU (The picture above takes STM8L MCU
as an example)
1
The wireless serial port 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.

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5. Function Description
5.1 Fixed Transmission
5.2 Broadcasting Transmission

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5.3 Broadcasting address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
When module is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the purpose of
broadcast is realized.
5.4 Monitor address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
When module A is the receiver, it can receive the data sent from all modules under channel 0x04, the purpose of monitor is
realized.
5.5 Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the operating mode based
on user’s parameters. During the process, the AUX remains low level. After the process completed, the AUX outputs high level and
starts to work as per the operating mode combined by M1 and M0. Therefore, users need to wait the AUX rising edge as the start of
module’s normal work.
5.6 AUX description
AUX Pin can be used as indication for wireless send & receive buffer and self-check.
It can indicate whether there are data that are not sent yet via wireless way, or whether all wireless data has been sent through
UART, or whether the module is still in the process of self-check initialization.
5.6.1 Indication of UART output
To wake up the external MCU
5.6.2 Indication of wireless transmitting
Buffer empty: the data in the internal 400-byte buffer is written to the wireless chip (automatic sub-packaging);
When AUX=1, the user continuously initiates data less than 400 bytes without overflow;

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When AUX=0, the buffer is not empty: the data in the internal 400-byte buffer has not been written to the wireless
chip and the transmission is started. At this time, the module may be waiting for the end of the user data to time out,
or the wireless sub-packet transmission is in progress.
[Note]: When AUX=1, it does not mean that all serial port data of the module has been transmitted wirelessly, and
the last packet of data may be being transmitted.
5.6.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode
5.6.4 Notes for AUX
No.
AUX Description
1
For function 1 & function 2 mentioned above, the priority should be given to the one with low level output, which means if
it meets each of any low level output condition, AUX outputs low level, if none of the low level condition is met, AUX
outputs high level.
2
When AUX outputs low level, it means the module is busy & cannot conduct operating mode checking. Within 1ms since
AUX outputs high level, the mode switch will be completed.
3
After switching to new operating mode, it will not work in the new mode immediately until AUX rising edge lasts for 2ms.
If AUX stays on the high level, the operating mode switch can be affected immediately.
4
When the user switches to other operating modes from mode 3 (sleep mode) or it’s still in reset process, the module will
reset user parameters, during which AUX outputs low level.
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.

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6. Operating Mode
There are four operating modes, which are set by M1 and M0, the details are as follows:
Mode（0-3）
M1
M0
Description
Remark
0 Transmission
Mode
0
0
UART and wireless channel are open, transparent transmission is
on
—
1 WOR
Transmitting
Mode
0
1
WOR transmits data, WOR receives data
Supports wake up over air
2 WOR
Receiving Mode
1
0
WOR transmitting is closed, WOR receiving data
—
3 Deep Sleep
Mode
1
1
Parameters can be configured
—
6.1 Mode Switching
No.
Remark
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 input 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.

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6.2 Normal mode（Mode 0）
Type
When M0 = 0, M1 = 0, the module works in mode 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.
6.3 WOR sending mode (Mode 1)
Type
When M0 = 1, M1 = 1, the module works in mode 1
Transmitting
Wireless data transmitting is turned on.
Receiving
Wireless data reception is turned on.
6.4 WOR receiving mode (Mode 2)
Type
When M0 = 0, M1 = 1, the module works in mode 2
Transmitting
Wireless transmission is off.
Receiving
Wireless data reception is turned on.
6.5 Deep Sleep Mode (Mode 3)
Type
When M0 = 1, M1 = 1, the module works in mode 3
Transmitting
Unable to transmit wireless data
Receiving
Unable to receive wireless data
Configurating
Users can access the registers to configure the working status of the module
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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7. Register Read and Write Control
7.1 Command Format
In configuration mode (mode 3: M1=1, M0=1), the supported command list is as follows (when setting, only 9600, 8N1 format is
supported):
No
Command Format
Description
1
Set Register
Command: C0+starting address+length+parameters
Response: C1+starting address+length+parameters
Example 1: Channel is 0x09
command starting address length parameter
Send：C0 05 01 09
Return：C1 05 01 09
Example 2：Configure module address (0x1234), serial port (9600 8N1), air speed (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+parameters
Response: C1+starting address+length+parameters
Example：Read channel
command starting address length parameter
Send：C1 05 01
Return：C1 05 01 09
Example 2: Read module address, serial port, and airspeed at the same time
Send：C1 00 04
Return：C1 00 04 12 34 00 61
3
Set Temporary
Register
Command: C2+starting address+parameters
Response: C1+starting address+length+parameters
Example 1: Channel is 0x09
command starting address length parameter
Send：C2 05 01 09
Return：C1 05 01 09
Example 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
4
Wrong Format
Wrong format responds
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,

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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
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
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）);
Instruction format: C0 C1 C2 C3+start
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

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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
22dBm（default）
0
1
17dBm
1
0
13dBm
1
1
10dBm
04H
Read/
Write
REG2
Channel Control（CH）
0-80 represents a total of 81 channels
Actual frequency = 850.125 + CH *1M
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
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
0
500ms
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
Model
Factory default parameter：c0 00 00 62 00 17
Model No.
Frequency
Address
Channel
Air Rate
Baud Rate
Serial Format
Power
E220-900T22S
873.125MHz
0x0000
0x17
2.4kbps
9600
8N1
22dbm

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8. Configuration Instruction on Computer
The following figure shows the display interface of the E220-900T22S 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 host computer, the module address, frequency channel, network ID, and key are all displayed in
decimal mode; the value range of each parameter:
Network address：0～65535
Frequency channel：0～83
Internet ID：0～255
Key：0～65535

Chengdu Ebyte Electronic Technology Co., Ltd. E220-900T22S User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co., Ltd.
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9. Hardware Design
It is recommended to use a DC stabilized power supply to supply power to the module. 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, 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% of the margin, and
the whole machine is conducive to long-term stable operation;
The module should be as far away as possible from power supply, transformer, high frequency wiring and other parts with large
electromagnetic interference;
High-frequency digital traces, high-frequency analog traces, and power traces must avoid under the module. If they really need
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 Good grounding), 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), it will also greatly affect the performance of the module. According to the intensity of the
interference, it is recommended to stay away from the module. Isolation and shielding;
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 influence 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.

Chengdu Ebyte Electronic Technology Co., Ltd. E220-900T22S User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co., Ltd.
19
10. FAQ
10.1 Communication range is too short
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 results near the ground are poor;
Sea water has a strong ability to absorb radio waves, so the seaside test results are poor;
If there is a metal object near the antenna or placed in a metal shell, the signal attenuation will be very serious;
The power register setting is wrong, the air speed setting is too high (the higher the air speed, the closer the distance);
The low voltage of the power supply at room temperature is lower than the recommended value, 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 easy to damage
Please check the power supply to ensure that it is within the recommended power supply voltage. If it exceeds the maximum
value, the module will be permanently damaged;
Please check the stability of the power supply, and the voltage should not fluctuate greatly and frequently;
Please ensure anti-static operation during installation and use, and high-frequency components are electrostatically sensitive;
Please ensure that the humidity during installation and use should not be too high, and some components are humidity sensitive
devices;
If there is no special requirement, it is not recommended to use it at too high or too low temperature.
10.3 BER (Bit Error Rate) is 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. Ensure the reliability of the power supply;
Poor or too long extension cables and feeders can also cause high bit error rates.