Ebyte E220-400T30S User manual

E220-400T30S User Manual

CONTENTS
1. OVERVIEW ........................................................................................................................................................................................................................ 3
1.1 INTRODUCTION ....................................................................................................................................................................................................................................3
1.2 FEATURES .............................................................................................................................................................................................................................................3
1.3 APPLICATION .............................................................................................................................................................................................................................4
2. SPECIFICATION AND PARAMETER.......................................................................................................................................................................... 4
2.1 LIMIT PARAMETER...............................................................................................................................................................................................................................4
2.2 OPERATING PARAMETER ....................................................................................................................................................................................................................4
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
5.6.2 Indication of wireless transmitting ...................................................................................................................................................................................... 11
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 TRANSMITTING MODE（MODE 1）................................................................................................................................................................................... 13
6.4 WOR RECEIVING MODE（MODE 2）........................................................................................................................................................................................... 13
6.5 DEEP SLEEP MODE（MODE 3）..................................................................................................................................................................................................... 14
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................................................................................................................................................18
9 HARDWARE DESIGN ...........................................................................................................................................................................................................18
10 FAQ...........................................................................................................................................................................................................................................19
10.1 COMMUNICATION RANGE IS TOO SHORT..................................................................................................................................................................................... 19
10.2 MODULE IS EASY TO DAMAGE ..................................................................................................................................................................................................... 20
10.3 BER(BIT ERROR RATE) IS HIGH .................................................................................................................................................................................................. 20
11 PRODUCTION GUIDANCE ...............................................................................................................................................................................................20

Chengdu Ebyte Electronic Technology Co., Ltd. E220-400T30S User manual
11.1 REFLOW SOLDERING TEMPERATURE ........................................................................................................................................................................................... 20
11.2 REFLOW SOLDERING CURVE ......................................................................................................................................................................................................... 21
12 E220 SERIES ..........................................................................................................................................................................................................................21
13 ANTENNA RECOMMENDATION....................................................................................................................................................................................22
14 PACKAGE FOR BATCH ORDER .....................................................................................................................................................................................23
REVISION HISTORY................................................................................................................................................................................................................23
FCC STATEMENT .....................................................................................................................................................................................................................24
ABOUT US ...................................................................................................................................................................................................................................24

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1. Overview
1.1 Introduction
E220-400T30S is a wireless serial port module (UART) based on
SEMTECH's SX1268, working at 433.125, 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, and smaller size; it supports functions such as air wake-up, wireless configuration, carrier monitoring,
automatic relay. communication keys and sub-package length setting. Ebyte provides customized development services
on it. An obvious advantage is that SX1268 covers wider frequency range.
1.2 Features
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
⚫
SX1268 LoRa chip brings lower power consumption, further communication distance and stronger anti-interference
ability;
Communication distance tested is up to 10 km；
software multi-level adjustable；
The communication allows users to set key that cannot be read, greatly improving the user data privacy;
Wireless parameters configuration, sent via wireless instruction packet, or read a wireless remote configuration
module parameter;
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;
Supports the global license-free ISM 433MHz for global meter reading；
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 RSSI for evaluating signal quality, improving communication network, and ranging;
Supports LBT for monitoring channel environmental noise before sending data, and for improving communication.
Supports air date rate of 2.4kbps～62.5kbps；
Supports 3.0V~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.

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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.
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）433.125 - 433.125 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
-
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 =

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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
10km
Test condition：clear and open area,
antenna gain: 0dBi，antenna height: 2.5m，
air data rate: 2.4kbps
TX length
240 Byte
Can be configured via command as
32/64/128/240 bytes per packet to
transmit
Buffer
256 Byte
-
Modulation
GFSK
-
LoRa
-
Communication interface
UART
TTL level
Package
SMD
-
Connector
1.27 mm
-
Size
40.5*25 mm
-
Antenna
IPEX/stamp hole
50 ohm impedance

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3 Size and pin definition
No.
Name
Direction
Function
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. Can be
configured as open-drain or pull-up input. Ground

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8
TXD
Output
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be
configured as open-drain or push-pull output
9
AUX
Output
To indicate module ’ s working status & wakes up the external MCU. During the
procedure of self-check initialization, the pin outputs low level. Can be
configured as push-pull output (can be suspended).
10
VCC
-
Power supply ：3.0~ 5.5V DC
11
GND
-
Ground
12
NC
-
Can be suspended
13
GND
-
Ground
14
NC
-
Can be suspended
15
NC
-
Can be suspended
16
NC
-
Can be suspended
17
NC
-
Can be suspended
18
NC
-
Can be suspended
19
GND
-
Ground
20
GND
-
Ground
21
ANT
-
Ground
22
GND
-
High frequency signal output, 50 ohm characteristic impedance

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4. Connect to MCU
No.
Description（STM8L MCU）
1
The UART module is TTL level.
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 external MCU

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5.6.2 Indication of wireless transmitting
Buffer (empty): the internal 256 bytes data in the buffer are written to the RFIC (Auto sub-packaging). When
AUX=1, the user can input data less than 256 bytes continuously without overflow. Buffer (not empty): when AUX=0,
the internal 256 bytes data in the buffer have not been written to the RFIC completely. If the user starts to transmit data at
this circumstance, it may cause overtime when the module is waiting for the user data, or transmitting wireless sub
package. When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, perhaps
the last packet of data is still in transmission.
5.6.3 Configuration procedure of module
⚫Only happened when power-on resetting or exiting sleep mode
5.6.4 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.
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 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
-
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.
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.

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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）
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.
6.3 WOR transmitting mode（Mode 1）
Type
M0 = 1，M1 =0
Transmitting
Wireless data transmitting is enabled
Receiving
Wireless data receiving is enabled
6.4 WOR receiving mode（Mode 2）
Type
M0 = 0，M1 = 1
Transmitting
Wireless transmitting off
Receiving
Wireless receiving on

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6.5 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.
7 Register read and write control
7.1 Command format
In configuration mode (mode 2: M1 = 1, M0 = 0), 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

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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
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/Wr
ite
ADDH
ADDH（default 0）
⚫The module address is high byte and low byte. Note:
When the module address is FFFF, it can be used as
the broadcast and monitor address, that is the module
will not perform address filtering.
01H
Read/Wr
ite
ADDL
ADDL（default 0）
02H
Read/Wr
ite
REG0
7，6，5 UART: Serial port rate（bps）
000: 1200
001: 2400
010: 4800
011: 9600（default）
100: 19200
101: 38400
110: 57600
111: 115200
---------------------------------------
4，3： Serial parity bit
00：8N1（default）
01：8O1
10：8E1
11：8N1（equal to 00）
-----------------------------------
2，1，0，air data rate
000: 2.4k（default）
001: 2.4k（default）
010: 2.4k（default）
011: 4.8k
100: 9.6k
101: 19.2k
110: 38.4k
111: 62.5k
⚫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 transmitting large packets continuously, users
need to consider the data blocking caused by the
same baud rate, and data may even be lost. It is
generally recommended that both parties have the
same baud rate.
---------------------------------------
⚫Both parties must be the same
⚫The higher the rate, the shorter the distance

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03H
Read/Wr
ite
REG1
7，6：Sub packet setting
00: 240 bytes（default）
01: 128 bytes
10: 64 bytes
11: 32 bytes
--------------------------------------
5 ：RSSI Ambient noise enable
1: Enable
0: Disable（default）
--------------------------------------
4，3，2 Reserve
--------------------------------------
1，0：Transmitting power
⚫When the data is smaller than the sub packet length,
the serial output of the receiving end is an
uninterrupted continuous output.
When the data is larger than the sub packet length,
the receiving end serial port will output the sub
packet.
--------------------------------------------
⚫When enabled, the C0 C1 C2 C3 command can be
sent in the transmitting mode or WOR transmitting
mode to read the register.
Register 0x00: Current ambient noise rssi
Register 0X01: rssi when the data was received last
time.（Current channel noise is: dBm =-RSSI/2）
Command format: C0 C1 C2 C3 + starting address +
read length
Returns: C1 + address address + read length + read
valid value
E.g: send C0 C1 C2 C3 00 01
Return C1 00 01 rssi
----------------------------------
⚫Power and current are nonlinear, and power
efficiency is highest at maximum power.
⚫The current does not decrease in proportion to the
decrease in power.
04H
Read/Wr
ite
REG2
Channel control（CH）
0-83 represents a total of 84 channels
⚫Frequency= 410.125 + CH *1M

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05H
Read/
Write
REG3
7 Enable RSSI
1：Enable
0：Disable（default）
--------------------------------------
6 Fixed point transmission
1：Fixed point transmission mode
0 ：Transparent transmission mode
（default）
---------------------------------------
5 N/A
1：-
0：-
--------------------------------------
4 N/A
1：-
0：
--------------------------------------
3 N/A
1：WOR transmitter
The module receiving and transmitting functions
are turned on, and a wake-up code is added when
transmitting data. Receiving is turned on.
0：WOR receiver（default）
The module is unable to transmit data and works
in WOR monitoring mode. The monitoring
period is as follows (WOR cycle), which can
save a lot of power.
---------------------------------------
2，1，0，WOR cycle
000：500ms
001：1000ms
010：1500ms
011：2000ms
100：2500ms
101：3000ms
110：3500ms
111：4000ms
⚫When enabled, the module receives wireless data
and it will follow an RSSI strength byte after output
via the serial port TXD
.---------------------------------------
⚫In fixed point transmission, the module recognizes
the first three bytes of the serial data as: address high
+ address low + channel and takes it as the wireless
transmitting target.
----------------------------------------
-
----------------------------------------
-
----------------------------------------
⚫Valid only for mode 1.
1. In the receiving mode of WOR, the module can modify
the delay time after wake-up, the default time is 0;
2. The receiving end needs to send the command C0 09 02
03 E8 in the configuration mode (C0 is the write
command, 09 is the register starting address, 02 is the
length, 03 E8 is the set delay, the maximum FFFF is
65535ms, set to 0 turns off the wake-up delay.)
3. Data can be sent within the delay
---------------------------------------------
⚫Valid only for mode 1.
⚫Period T = (1 + WOR) * 500ms, maximum 4000ms,
minimum 500ms
⚫The longer the WOR monitoring interval period, the
lower the average power consumption, but the
greater the data delay
⚫Both the transmitter and the receiver must be the
same (very important).
06H
Write
CRYPT_
H
Key high byte (default 0）
⚫Write only, read returns 0
⚫Used for user encryption to avoid intercepting
airborne wireless data by similar modules.
⚫The module will internally use these two bytes as a
calculation factor to transform and encrypt the
over-the-air wireless signal.
07H
Write
CRYPT_
L
Key low byte (default 0)
08H~
Read
Version
Version information 1 byte
⚫Version information 1 byte
7.3 Factory default parameter
Factory default parameters：C0 00 00 62 00 00

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8 Configuration instructions on computer
⚫The following figure shows the E220-400T30S configuration host computer display interface, the user can switch to the
command mode through M0M1, and quickly configure and read the parameters on computer.
⚫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: 0-83
Network ID: 0-255
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,

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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；
⚫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