Ebyte E220-230T30D User manual

E220-230T30D User Manual
220/236MHz 30dBm LoRa Wireless Module

Contents
1. Overview.....................................................................................................................................................................3
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. Recommended Connection Diagram..........................................................................................................................7
5. Function Description.................................................................................................................................................. 8
5.1 Fixed Transmission...........................................................................................................................................8
5.2 Broadcasting Transmission...............................................................................................................................8
5.3 Broadcasting Address....................................................................................................................................... 9
5.4 Monitor Address............................................................................................................................................... 9
5.5 Reset..................................................................................................................................................................9
5.6 AUX Description.............................................................................................................................................. 9
6. Operating Mode........................................................................................................................................................ 11
6.1 Mode Switching..............................................................................................................................................11
6.2 Normal mode（Mode 0）..............................................................................................................................12
6.3 WOR sending mode (Mode 1)....................................................................................................................... 12
6.4 WOR receiving mode (Mode 2).....................................................................................................................12
6.5 Deep Sleep (Configuration) Mode (Mode 3)................................................................................................. 13
7 Register Read and Write Control...............................................................................................................................13
7.1 Command Format........................................................................................................................................... 13
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
13.1 Antenna Recommendation........................................................................................................................... 21
14. Package for Bulk Order.......................................................................................................................................... 22
Revision History........................................................................................................................................................... 22
About us........................................................................................................................................................................23

成都亿佰特电子科技有限公司 E28-2G4M12S 产品规格书
Copyright ©2012–2020，成都亿佰特电子科技有限公司
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.

Chengdu Ebyte Electronic Technology Co., Ltd. E220-400T30D User Manual
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1. Overview
1.1 Introduction
E220-230T30D adopts a new generation of LoRa spread spectrum technology
and is a wireless serial port module (UART) designed on the LLCC68 chip set. It has
a variety of transmission methods, working at 220.125 ～236.125MHz (default
230.125MHz), with TTL level output, compatible with 3.3V and 5V IO port voltage.
E220-230T30D adopts a new generation of LoRa spread spectrum technology,
supports air wake-up, carrier sense, communication key and other functions, supports
sub-package length setting, and Ebyte provides customized development services.
1.2 Features
The new LoRa spread spectrum modulation technology developed based on LLCC68, it brings a longer communication distance
and stronger anti-interference ability;
The communication allows users to set key that cannot be read, greatly improving the user data privacy;
Support LBT function, monitor the channel environment noise before sending, which greatly improves the communication
success rate of the module in harsh environments;
Support RSSI signal strength indicator function for evaluating signal quality, improving communication network, and ranging;
Support air wake-up, that is ultra-low power consumption, suitable for battery-powered applications;
Support point to point transmission, broadcast transmission, channel sense;
Support deep sleep, the power consumption of the whole machine is about 5uA in this mode;
The module has built-in PA+LNA, and the communication distance can reach 10km under ideal conditions;
The parameters are saved after power-off, and the module will work according to the set parameters after power-on;
Efficient watchdog design, once an exception occurs, the module will automatically restart and continue to work according to the
previous parameter settings;
Support the bit rate of 2.4k～62.5kbps;
Support 3.0～5.5V power supply, power supply greater than 5V can guarantee the best performance;
Industrial standard design, supporting long-term use at -40～+85℃;
SMA antenna interface.
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;
Advanced Meter Reading Architecture (AMI);
Automotive industry applications.

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2. Specification and Parameter
2.1 Limit Parameter
Table 2-1 Limit parameter table
Main Parameter
Performance
Remark
Min.
Min.
Power Supply（V）
-
5.5
Exceeding the maximum value may burn the
module permanently
Blocking Power（dBm）
-
10
-
Operating Temperature（℃）
-40
+85
Industrial grade
2.2 Operating Parameter
Table 2-2 Working parameter table
Main Parameter
Performance
Remark
Min.
Typ.
Max.
Operating voltage（V）
3.0
5
5.5
≥5.0 V ensures output power
Communication level（V）
-
3.3
-
For 5V TTL, it may be burning down
Operating temperature（℃）
-40
-
+85
Industrial design
Operating frequency（MHz）
220.125
-
230.125
Support ISM band
Power
consumption
TX current(mA)
-
620
-
Instant power consumption @30dBm
RX current (mA)
-
17.2
-
5V Voltage
Sleep current（μA）
-
5
-
software shutdown
Max Tx power（dBm）
29
30
30
-
Receiving sensitivity（dBm）
-146
-147
-148
Air data rate 2.4kbps
Air data rate（bps）
2.4k
2.4k
62.5k
To control via user’s program
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
32/64/128/200 bytes per packet to transmit
Buffer
400 Byte
-
Modulation
LoRa
New generation LoRa modulation technology
Communication interface
UART Serial Port
TTL Level
Package
DIP
-
Size
24*43mm
-
Antenna
SMA-K
50 ohm impedance

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3. Size and Pin Definition
Figure 3-1 Mechanical size and pin definition
Table 3-1 Pin definition table
Pin No.
Pin Name
Pin Direction
Pin Function
1
M0
Input
（weak pull-up）
Work with M1 to decide 4 working modes of module (not float, if not used,
could be grounded).
2
M1
Input
（weak pull-up）
Work with M0 to decide 4 working modes of module (not float, if not used,
could be grounded).
3
RXD
Input
TTL UART inputs, connects to external TXD output pin.
4
TXD
Output
TTL UART outputs, connects to external RXD input pin.
5
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)
6
VCC
Input
Voltage range: 3.0～5.5V DC
7
GND
Input
Ground
8
Fixed hole
-
Fixed hole
9
Fixed hole
-
Fixed hole
10
Fixed hole
-
Fixed hole
11
Fixed hole
-
Fixed hole

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4. Recommended Connection Diagram
Figure 4-1 Recommended connection diagram
Table 4-1 Description
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 5V MCU, it may be necessary to add 4-10K pull-up resistors to the TXD and AUX pins of the module.

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5. Function Description
5.1 Fixed Transmission
Figure 5-1 Fixed Transmission
5.2 Broadcasting Transmission
Figure 5-2 Broadcasting Transmission

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5.3 Broadcasting Address
Example: Set the address of module A to 0xFFFF and the channel to 0x04.
When module A is used as a transmitter (same mode, transparent transmission mode), all receiving modules under the 0x04
channel can receive data to achieve the purpose of broadcasting.
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
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 keeps low level, and AUX outputs high level after completion,
and starts to work normally according to the working mode formed by M1 and M0; Therefore, the user needs to wait for the
rising edge of AUX as the starting point for the module to work normally.
5.6 AUX Description
AUX Pin can be used as indication for wireless send & receive buffer and self-check.
It can indicate whether there are data that are not sent yet via wireless way, or whether all wireless data has been sent through
UART, or whether the module is still in the process of self-check initialization.
5.6.1 Indication of UART Output
To wake up external MCU
Figure 5-3 To wake up external MCU

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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;
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 turned on. 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.
Figure 5-4 Transmitting indication
5.6.3 Configuration Procedure of Module
Only happened when power-on resetting or exiting sleep mode
Figure 5-5 Configuration mode

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5.6.4 Notes for AUX
Table 5-1 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 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 FSK. It
is recommended that customers do not transmit large amounts of data at low airspeeds to avoid communication
abnormalities caused by data accumulation and data loss.
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 Transmitter
2 WOR
Receiving Mode
1
0
WOR Receiver
Supports wake up over air
3 Deep Sleep
Mode
1
1
Module goes to sleep (automatically wake up when configuring
parameters)
Supports configuration
6.1 Mode Switching
Table 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 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.

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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.
6.2 Normal mode（Mode 0）
Table 6-2 Normal mode
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)
Table 6-3 WOR sending mode
Type
When M0 = 1, M1 = 0, the module works in mode 1
Transmitting
When defined as a transmitting party, a preamble is automatically added before transmitting.
Receiving
It can receive data normally, the receiving function is the same as mode 0.
6.4 WOR receiving mode (Mode 2)
Table 6-4 WOR receiving mode
Type
When M0 = 0, M1 = 1, the module works in mode 2

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Transmitting
Wireless transmission off
Receiving
Can only receive data in WOR transmission mode (mode 1)
6.5 Deep Sleep (Configuration) Mode (Mode 3)
Table 6-5 Sleep mode
Type
When M0 = 1, M1 = 1, the module works in mode 3
Transmitting
Unable to transmit wireless data
Receiving
Unable to receive wireless data
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.
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):
Table 7-1 Command format
No
Command Format
Description
1
Write 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 04 01 09
Return：C1 04 01 09
Example 2：Configure module address (0x1234), serial port (9600 8N1), air speed (2.4K)
Send：C0 00 03 12 34 62
Return：C1 00 03 12 34 62
2
Read Register
Command: C1+starting address+parameters
Response: C1+starting address+length+parameters
Example：Read channel
command starting address length parameter
Send：C1 04 01
Return：C1 04 01 09

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Example 2: Read module address, serial port, and airspeed at the same time
Send：C1 00 03
Return：C1 00 03 12 34 62
3
Write 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 04 01 09
Return：C1 04 01 09
Example 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1)
and air data rate (2.4K)
Send：C2 00 03 12 34 62
Return：C1 00 03 12 34 62
4
Wrong Format
Wrong format respond: FF FF FF
7.2 Register Description
Table 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;

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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
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

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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
Table 7-3 Default parameters
Model
Factory default parameter：C0 00 00 62 00 00
Module No.
Frequency
Module No.
Frequency
Module No.
Frequency
Module No.
Frequency
E220-230T30D
230.125MHz
0x0000
0x17
2.4kbps
9600
8N1
30dbm

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8. Configuration Instruction on Computer
The following figure shows the display interface of the E220-230T30D 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：0～64
Key：0～65535

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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. E220-400T30D 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.

Chengdu Ebyte Electronic Technology Co., Ltd. E220-400T30D User Manual
Copyright ©2012–2020，Chengdu Ebyte Electronic Technology Co., Ltd.
20
11. Soldering Operation Guidance
11.1 Reflow Soldering Temperature
Table 11-1 Register description
Profile Feature
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
100℃
150℃
Preheat temperature max (Tsmax)
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
3℃/second max
3℃/second max
Liquidous Temperature (TL)
183℃
217℃
Time（tL）Maintained Above（TL）
60-90 sec
30-90 sec
Peak temperature（Tp）
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
6℃/second max
6℃/second max
Time 25℃to peak temperature
6 minutes max
8 minutes max
11.2 Reflow Soldering Curve