Ebyte E22-400T22D User manual

E22-400T22D User Manual
SX1268 433/470MHz 160mW LoRa Wireless Module

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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.......................................................................................................................7
5. FUNCTION DESCRIPTION..........................................................................................................8
5.1 FIXED TRANSMISSION.................................................................................................................................................... 8
5.2 BROADCASTING TRANSMISSION.................................................................................................................................... 8
5.3 BROADCASTING ADDRESS............................................................................................................................................. 8
5.4 MONITOR ADDRESS....................................................................................................................................................... 9
5.5 RESET............................................................................................................................................................................ 9
5.6 AUX DESCRIPTION........................................................................................................................................................ 9
5.6.1 Indication of UART output..................................................................................................................................... 9
5.6.2 Indication of wireless transmitting...................................................................................................................... 10
5.6.3 Configuration procedure of the module............................................................................................................... 10
5.6.4 Notes for AUX...................................................................................................................................................... 10
6. OPERATING MODE....................................................................................................................11
6.1 MODE SWITCHING........................................................................................................................................................11
6.2 NORMAL MODE（MODE 0）...................................................................................................................................... 12
6.3 WOR MODE（MODE 1）........................................................................................................................................... 12
6.4 CONFIGURATION MODE（MODE 2）..........................................................................................................................12
6.5 DEEP SLEEP 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. REPEATER NETWORKING MODE......................................................................................... 16

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9. CONFIGURATION INSTRUCTIONS ON COMPUTER.........................................................18
10. HARDWARE DESIGN............................................................................................................... 19
11. FAQ................................................................................................................................................20
11.1 COMMUNICATION RANGE IS TOO SHORT................................................................................................................... 20
11.2 MODULE IS EASY TO DAMAGE...................................................................................................................................20
11.3 BER(BIT ERROR RATE)IS HIGH................................................................................................................................20
12. WELDING GUIDANCE............................................................................................................. 21
13. E22 SERIES..................................................................................................................................21
14. ANTENNA GUIDANCE..............................................................................................................21
14.1 ANTENNA RECOMMENDATION................................................................................................................................... 21
REVISION HISTORY....................................................................................................................... 22
ABOUT US......................................................................................................................................... 22

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1. Overview
1.1 Introduction
E22-400T22D is a wireless serial port module (UART) based on
SEMTECH's SX1268 RF chip. It has multiple transmission modes, working
in the 410.125MHz~493.125MHz, frequency (default 433.125MHz), LoRa
spread spectrum technology, TTL level output, compatible with 3.3V and 5V
IO port voltage.
E22-400T22D uses a new generation of LoRa spread spectrum technology. Compared with the traditional SX1278
solution, the SX1268 solution has a longer transmission distance, faster speed, lower power consumption and smaller
size. It Supports wake-up over air, wireless configuration, carrier monitoring, automatic relay, communication key and
other functions, supports sub-package length setting, and can provide custom development services.
1.2 Features
Develop a new LoRa spread spectrum modulation technology based on SX1268,which will bring longer
communication distance and stronger anti-interference ability;
Support automatic relay networking, multi-level relay is suitable for ultra-long distance communication, multiple
networks running in the same area are running simultaneously;
Support users to set their own communication keys, which cannot be read, greatly improving the confidentiality of
user’s data;
Support LBT function, monitor the channel environmental noise before sending, which can greatly improve the
communication success rate of the module in harsh environments;
Support RSSI signal strength indication function for evaluating signal quality, improving communication network,
ranging;
Support wireless parameter configuration, send command data packets wirelessly, remotely configure or read
wireless module parameters;
Support wake-up over air, that is, ultra-low power consumption function, suitable for battery-powered applications;
Supports fixed-point transmission, broadcast transmission, and channel monitoring;
Supports deep hibernation, and the whole machine consumes about 2uA in this mode;
Support the global license-free ISM 433MHz band and 470MHz meter reading frequency band;
Under ideal conditions, the communication distance can reach 5km;
The parameters are saved when 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 data transmission rate of 0.3k ～62.5kbps;
Support 2.3 ~ 5.5V power supply, power supply over 5V can ensure the best performance;
Industrial grade standard design, support long-term from at -40 ～+ 85 ℃;
The size and shape are consistent with our E32 series modules, which can be directly replaced to improve product
performance and distance.

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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
Industrial grade
2.2 Operating parameter
Main parameter
Performance
Remark
Min.
Typ.
Max.
Operating voltage（V）
2.3
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）
410.125
433.125
493.125
Support ISM band
Power
consu
mption
TX current（mA）
-
110
-
Instant power consumption
RX current（mA）
-
12
-
-
Sleep current（μA）
-
2
-
Software is shut down
Max Tx power（dBm）
21.5
22.0
22.5
-
Receiving sensitivity（dBm）
-146
-147
-148
Air data rate is 0.3 kbps
Air data rate（bps）
0.3k
2.4k
62.5k
Controlled via user’s programming

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Main parameter
Description
Remark
Distance for reference
5km
Test condition：clear and open area, antenna gain: 5dBi，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
1000 Byte
-
Modulation
LoRa
New generation LoRa modulation technology
Communication interface
UART
TTL level
Package
DIP
-
Connector
1*7*2.54mm
-
Size
21*36 mm
-
Antenna
SMA
50 ohm impedance

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3. Size and pin definition
No.
Name
Direction
Function
1
M0
Input
（weak pull-up）
Work with M1 to decide 4 working modes of module (not suspended, if not
used, could be grounded).
2
M1
Input
（weak pull-up）
Work with M0 to decide 4 working modes of module (not suspended, if not
used, could be grounded).
3
RXD
Input
TTL UART input, connects to external TXD output pin.
4
TXD
Output
TTL UART output, connects to external RXD input pin.
5
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.

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(suspending is allowed).
6
VCC
Power supply
Module power supply positive reference, voltage range: 2.3 ～5.5V DC
7
GND
Power supply
Ground
8
Fixed hole
Fixed hole（Connect to GND on the module）
9
Fixed hole
Fixed hole（Connect to GND on the module）
10
Fixed hole
Fixed hole（Connect to GND on the module）
4. Connect to MCU
No.
Description（STM8L MCU）
1
The UART module is TTL level, please connect with TTL level MCU.
2
For some MCU works at 5V DC, 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
5.3 Broadcasting address
For example: Set the address of module A as 0xFFFF, and the channel as 0x04;
When module is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the

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purpose of broadcast is realized.
5.4 Monitor address
For example: Set the address of module A as 0xFFFF, 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 on, 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 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 sending & receiving 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 1000 bytes data in the buffer are written to the RFIC (Auto sub-packaging);
When AUX=1, users can input data less than 1000 bytes continuously without overflow;
When AUX=0, Buffer (not empty): the internal 1000 bytes data in the buffer have not been written to the RFIC
completely. If users 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.
Note: When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, maybe
the last packet of data is still in transmission.
5.6.3 Configuration procedure of the 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 takes effect immediately.

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4
When users switch 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. For example, at 1.2kbps, the 100-byte transmission delay is about 1.5 seconds. It is recommended
that customers do not transmit large amounts of data at low airspeed in order to avoid data loss caused by data
accumulation and communication abnormalities.
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
Supports configuration
over air via special
command
1 WOR mode
0
1
Can be defined as WOR transmitter and WOR receiver
Supports wake up over air
2
Configuration
mode
1
0
Users can access the register through the serial port to control the
working state of the module
3 Deep sleep
mode
1
1
Sleep mode
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 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 level.
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 mode（Mode 1）
Type
M0 = 1，M1 = 0
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 Configuration mode（Mode 2）
Type
M0 = 0，M1 = 1
Transmitting
Wireless transmitting off
Receiving
Wireless receiving off
Configuration
Users can access the registers to configure the module's operation state.

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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
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
Return: C1 05 01 09
E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air
data rate (1.2K).
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
Return: 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+length+parameters
Response: C1+starting address+length+parameters
E.g 1: Channel is 0x09
command starting address length parameter
Send: C2 05 01 09
Return: C1 05 01 09
E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air
data rate (1.2K).
Send: C2 00 04 12 34 00 61

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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
Return: CF CF C1 05 01 09
E.g 2: Configure module address (0x1234), network address (0x00), serial port (9600 8N1) and air
data rate (1.2K).
Send: CF CF C2 00 04 12 34 00 61
Return: CF CF C1 00 04 12 34 00 61
6
Wrong format
Wrong format respond: FF FF FF
7.2 Register description
Address
Read
or
write
Name
Description
Remark
00H
Read/
Write
ADDH
ADDH（default 0）
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/
Write
ADDL
ADDL（default 0）
02H
Read/
Write
NETID
NETID（default 0）
Network address, used to distinguish the network.
When communicating with each other, they
should be set to the same.
03H
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 parity 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.
0
0
0
Serial port baud rate is1200
0
0
1
Serial port baud rate is 2400
0
1
0
Serial port baud rate is 4800
0
1
1
Serial port baud rate is 9600
（default）
1
0
0
Serial port baud rate is 19200
1
0
1
Serial port baud rate is 38400
1
1
0
Serial port baud rate is 57600
1
1
1
Serial port baud rate is 115200
4
3
Serial parity bit
The serial port modes of the two communication
parties can be different;
0
0
8N1（default）
0
1
8O1
1
0
8E1
1
1
8N1（equal to 00）
2
1
0
Wireless air data rate（bps）
The air rate of both communication 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 0.3k
0
0
1
Air data rate 1.2k
0
1
0
Air data rate 2.4k（default）
0
1
1
Air data rate 4.8k

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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
04H
Read/
Write
REG1
7
6
Sub packet setting
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.
0
0
240 bytes（default）
0
1
128 bytes
1
0
64 bytes
1
1
32 bytes
5
RSSI Ambient noise enable
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: RSII when the data was received
last time.
（Current channel noise is: dBm =-RSSI/2）
Command format: C0 C1 C2 C3 + starting
address + read length
Return: C1 + address + read length + read valid
value
E.g: 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
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.
0
0
22dBm（default）
0
1
17dBm
1
0
13dBm
1
1
10dBm
05H
Read/
Write
REG2
Channel control（CH）
0-83 represents a total of 84 channels
Frequency= 410.125 + CH *1M
06H
Read/
Write
REG3
7
Enable RSSI
When enabled, the module receives wireless data
and it will follow an RSSI strength byte after
output via the serial port TXD.
0
Disable（default）
1
Enable
6
transmission mode
During 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.
0
Transparent transmission mode（default）
1
Fixed point transmission
5
Relay function
After the reply function is enabled, if the target
address is not the module itself, the module will
forward it once.
In order to prevent data return-back, it is
recommended to use it in conjunction with the
fixed point mode. That is: the target address is
different from the source address.
0
Disable repeater function（default）
1
Enable repeater function
4
LBT enable
When enabled, wireless data will be monitored
before it is transmitted, which can avoid
interference to a certain extent, but may cause
data delay.
0
Disable（default）
1
Enable

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The maximum lingering time of LBT is 2
seconds, and it will be sent when it reaches 2
seconds.
3
WOR transceiver control
Valid only for mode 1.
1. In the receiving mode of WOR, the module can
modify the delay time after wake-up.Default time
is 0;
2. The receiving end needs to send the command
C0 09 02 03 E8 in configuration mode (C0 is the
write command, 09 is the register initiator
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.
0
WOR receiver（default）
The module works in WOR monitoring mode.
The monitoring period is as follows (WOR
cycle), which can save a lot of power.
1
WOR transmitter
The module receiving and transmitting
functions are turned on, and a wake-up code is
added when transmitting data.
2
1
0
WOR period
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).
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
07H
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.
08H
Write
CRYPT
_L
Key low byte (default 0)
80H～86H
Read
PID
Product information 7 bytes
Product information 7 bytes
7.3 Factory default parameter
No.
Factory default parameters: 62 00 00 00 00 00
Model No.
Frequency
Address
Channel
Air data rate
Baud rate
Serial format
Power
E22-400T22D
433.125MHz
0x0000
0x17
2.4kbps
9600
8N1
22dbm
8. Repeater networking mode
No.
Description

Chengdu Ebyte Electronic Technology Co.,Ltd. E22-400T22D User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 8-17
1
After setting the repeater mode by configuration, switch to the normal mode and the repeater starts working.
2
In the repeater mode, ADDH, ADDL are no longer used as the module address, but is correspondingly paired with the NETID. If the data of
one of the networks is received, it is forwarded to another network. The network ID of the repeater itself is invalid.
3
In repeater mode, the repeater module cannot transmit and receive data, and cannot perform low-power operation.
4
The user enters the other mode from mode 3 (sleep mode) or during the reset process, the module resets the user parameters during which
the AUX outputs low level.
Repeater networking rules:
1. Forwarding rules, the repeater can forward data in both directions between two NETIDs.
2. In repeater mode, ADDH\ADDL is no longer used as the module address, and it is used as a NETID forwarding
pairing flag.
Figure:
①Primary repeater
“Node 1” NETID is 08.
“Node 2” NETID is 33.
Primary repeater 1‘s ’ADDH\ADDL are 08，33.
So the signal sent by node 1 (08) can be forwarded to node 2 (33)
At the same time, node 1 and node 2 have the same address, so the data transmitted by node 1 can be received by node 2.
②Secondary repeater
Secondary repeater’s ADDH\ADDL are 33，05.
Therefore, Repeater 2 can forward the data of Repeater 1 to the network NETID: 05.
Thus node 3 and node 4 can receive node 1 data. Node 4 outputs data normally, and node 3 has a different address than node 1, so no
data is output.
③Two-way repeater
As shown in the figure: the data sent by node 1, the nodes 2, 4 can receive the data sent by node 2, 4, and node 1 can also
receive it.

Chengdu Ebyte Electronic Technology Co.,Ltd. E22-400T22D User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 9-18
9. Configuration instructions on computer
The following figure shows the E22-400T22D configuration host computer display interface, users 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

Chengdu Ebyte Electronic Technology Co.,Ltd. E22-400T22D User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd. 10-19
Frequency channel: 0-83
Network ID: 0-255
Key: 0-65535
When users configure the repeater mode using the host computer, special attention must be paid. Since the
parameters are in decimal mode in the host computer, the module address and network ID need to be converted into
hexadecimal.
For example, if the network ID input by the transmitting end A is 02, and the network ID input by the receiving end
B is 10, when the repeater end R sets the module address, the hexadecimal value 0X020A is converted into the
decimal value 522 as the repeater end R. Module address.
That is, the module address value of the repeater terminal R is 522 at this time.
10. Hardware design
It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible, and
the module needs to be reliably grounded.；
Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse
connection may cause permanent damage to the module；
Please check the power supply to ensure it is within the recommended voltage otherwise when it exceeds the
maximum value the module will be permanently damaged；
Please check the stability of the power supply, the voltage can not be fluctuated frequently；
When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the
margin, so the whole machine is beneficial for long-term stable operation.；
The module should be as far away as possible from the power supply, transformers, high-frequency wiring and other
parts with large electromagnetic interference.；
High-frequency digital routing, high-frequency analog routing, and power routing must be avoided under the
module. If it is necessary to pass through the module, assume that the module is soldered to the Top Layer, and the
copper is spread on the Top Layer of the module contact part(well grounded), it must be close to the digital part of
the module and routed in the Bottom Layer；
Assuming the module is soldered or placed over the Top Layer, it is wrong to randomly route over the Bottom Layer
or other layers, which will affect the module's spurs and receiving sensitivity to varying degrees；
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)；