Ebyte E49-400T20S User manual

(CDN
EBYTE
E49-400T20S User Manuel
433M Hz SMD Wireless Module
Chengdu Ebyte Electronic Technology Co.,Ltd.

CONTENTS
1. OVERVIEW ..uciniiiinninicnassocssanssssssssssssossssssssssssssssssosssssssssssssssssssssssssssessssssssssssssssssssssssssssssssssssssses 3
1.1 INTRODUCTION. c.teetittte ett eettte settee seees site asstaeestses sass eames east bees esses ames este e essen esses eaase senses as sae sess eeanse eens bee essee sane esnnbe ees sae sarees sans 4
7 Bl FN LE) 20 20 TURP 4
2. SPECIFICATION AND PARAMETER. .....iiiiniiinnsnccssossossssssssssssssossssssssssssssssssssssssasssssossssssess 5
2.1 LIMIT PARAMETER... vet tutteettteesttessetetasteeestaes assesses santas assess asses anes anste ee ass assess easse senses esse a see aanse senses asssea anes ansseeessaessnsen sans 5
2.2 OPERATING PARAMETER. .....0eiututeitttitaitteetee este a steessaseeessteeassaesssees sees esse e asses sess ee ane esas see ass ees ase a anne sass saeeasses sree annseaensbeesnnes 5
3. SIZE AND PIN DEFINITION. ccuuciicceccrsasscsssssansssssssrorsasssssssrsasssssssrsassssssssssssasssssssssassossssrsasssssssrsass 6
4. RECOMMENDED WIRING DIAGRAMu.uuiticiccnrsrssssosssssssasssssssssassssssssorsassssssrsassssssssrssssssssssassass 7
5. FUNCTION DESCRIPTION. ..cccccnnnieecnsassossssscssossosssssssssssssssosssssssssssossssssosssssssssssssssssressssssssossssssssss 8
5.1 IMMODULE RESET tee ittieiitttiettseuttie settee sete asses estae es ssees see asteeassae es aseeanse senses ass ae eases antes esses esses ase eans beeen sees assesses ennsbeeensae sane 8
5.2 AUX DETAILED EXPLANATION ......0eeituttiittaitteeattuessteesanneeassseeasssesssessassesasssesssssssassssnsessasssesssssssssssnssesassssesssesssssssnssessssnes 8
5.2.1 Wireless #eceiViig ITICAIION. ..............ccccociiiceiiii ieee eee eee 8
3.2.2 Wireless tranSmiSSiON fAICALTON. ................cc.oeeeee eee eee eee eee eee eee eee eee eee eee eee eee estes eee aetna ettae serene aes 8
5.2.3 Reset and exit SIEEP MOTe.................c.coooiiiiiiiiiiii ieee ee 9
RI RO) Q dee 1 10, TR 9
5.2.5 Detailed explanation of fixed-point OG. ...................c.ccoiviiiiiiiiiiiii ieee 9
3.2.6 BrOAACAST TFANISTHISSION. .........coeeeee eee eee eee eee eee eee ee ete eee e eet e settee eee eee settee eee e ee eneeenteeeereee ane nans 10
5.2.7 BPOQACASE QAAFESS........ceeeeeeeeeee eee eee eee eee eee eee eee eee eee eee eee ee eee teeta ease teenie eee esate eetaee eee eeenteeereens 10
5.2.8 MORGEOF AGAFCSS......ooeceeioeeeeeee eee eee eee eee eee eee eee eee eee eee eee eee ete eats eee eats settee eee eee eaten sere enenne as 11
6. OPERATING MODE ....ccccinnrrriccsscsssassssssssrsssssssrorsosssssrorssasssssssrsasssssssrsasssssssrorsssssssrsrsessosssssrsasesss 12
6.1 MODE SWITCHING... ..etettteettueeatttsieteeasieeesttaesaseesasee asses atsses sass aasse sass aeesssessanee asses as sae sass es anee sans beeassae sass eanse ee assaesssses anne anns 12
6.2 TRANSMISSION MODE (IMODED Doi viiitiiitie ieee cee esses et eee et esate ete sees tessa este e teste ete ease ates sree ere esseesbe sane are eae 13
6.3 RSSI MODE (MODEL)
(OS NIE (0) 0) A LY (6) 5) 25 HOOT R 14
6.5 SLEEP MODE (IMIODES J ..ee.eeie ieee eee eee ee es ese sees es testes e eee ete e teeta ease teats eee e eee e ee ane areas ate te nee ntensensansanean 14
6.6 FAST COMMUNICATION TEST... uttttutteeatteesitetssesessteestsessassassseeesssaessssssases asses assanssassssnsesesssesssssssssessnssesssssessssesansessssees 14
T. COMMAND FORMAT .ccuvteeicccsrcrsasssssssrasssssssrsssssssssssassssssssssssssssssrorsasssssssrsessssssssrsssssssssrsasssssssress 16
7.1 DEFAULT PARAMETERS... .etiuttettteetitttiaittaette settee esses eases essteesssee esses antes ass aeessses sesame bee es sees ese eases ans saeeabses ane eanseeensaeennnes 16
7.2 READING OPERATING PARAMETER .......0ectttttiititiiteatteeattee esate aasteeestaeestses sense assteeassae sass esses sassbeeassee sass sasesenssae sarees anseenns 16
7.3 READING VERSION NUMBER READING... .cceuuttetteeattuesateessteaessaes asses asses anssesassses assesses ansssessssssssssssssesesssssssssssassssnssessssses 16
7.4 PARAMETER SETTING INSTRUGCTION ......0etitttittteestteesttaesaseesasesasssaesssses sass aassesassssessssesasesansseeasssessasesansesssssesssssssssessnssees 17
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8. HARDWARE DESIGN....ccniiiinnieicnassossssscssssssssassssssssssssssossssssssssssssssssossssssssossssssssssssssssssessssssssss 19
9.1 COMMUNICATION RANGE IS TOO SHORT - «cut teeettuesstetessereassteestsessasesssseeassses assesses sasssesssssessssssssessssessssssssnsessssesssssesssnes 20
9.2 MODULE IS EASY TO DAMAGE... tttitittteutteeettiesateesateeesttesstses sass aassesasssee assess aes astee assess sass senses assteeassee sass santas esssesssnessnes 20
9.3 BER(BIT ERROR RATE) IS HIGH. .....cociiiiiiiiiiiieis icici cesses snes eens nse sessesssnne seen 20
10. WELDING OPERATION GUIDANC CK .....cuuiccnniiensssccsssscsssrssossonsssssssssssssssssasssssssssssassossassssses 21
10.1 REFLOW SOLDERING TEMPERATURE ........eeiiitttittteettteesteeesaes asses assaesssees asses esssee asses sssseasssesasssesssssssnsssnssesssssssssseesneeans 21
10.2 REFLOW SOLDERING CURVE... .0ecttuetitttsiitteesttee assess steasasesasstaesssses sass aasseaassseasssessases asses assse esses sassesesssesssssssnsesanssessssns 22
11. RELATED MODE L......ccccoviiimiiinsonccsssssssssnssssossossssssssssssssssssssonssssssssssssssssssssssssssssssasssssssssssesss 22
12. ANTENNA GUIDRE.....cconniiiinniiennancsssssscssossossssssssossssssssssssssssssssssssasssssssssssssssssssssssssssssssssssssssssses 23
12.1 ANTENNA RECOMMENDATION... tutte ttteteitteassteestsses sass aassesassaessssessases asses asssessssssasseeasssesssssssssessnseesasssessssssssessnssessssses 23
13. BATCH PACKAGING G......iiiinrnicnsancsssssssssrnsssssssossonssssssssssssssssssssssssssssssessosssssssrssssssssessosssssssses 24
REVISION HISTORY cvvvteeicccsssrsassssscsssassssssssorsssssssssrssssssssssrsssssssssrsssssssssrersessossssrses sossssrsassssssssesssass 24
ABOUT US iiiiinnnccnnniossssccssossesssassssessssssossosssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss assess ssssssessssssssss 25
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EBYTE
PEAMZ ERE FREER AE] E49-400T20S = gH
Disclaimer and copyright notice
The information in this article, including the URL for reference, is subject to change
without notice. The document is provided “as is” without warranty of any kind, including
any warranty of merchantability, fitness for a particular purpose or non-infringement, and
any warranty of any proposal, specification or sample referred to elsewhere. This document
does not bear any liability, including any infringement of any patent rights resulting from
the use of the information contained in this document. No estoppel or other license, express
or implied, is granted herein for the use of intellectual property.
All the test data obtained in this paper are obtained by E-Baite laboratory, and the actual
results may be slightly different.
It is hereby declared that all trade names, trade marks and registered trade marks
mentioned herein are the property of their respective owners.
The right of final interpretation belongs to Chengdu Yibaite Electronic Technology Co.,
LTD.
The attention
The contents of this manual may change due to product version upgrade or other reasons.
E-baite Electronic Technology Co., Ltd. reserves the right to modify the contents of this
manual without any notice or prompt. This manual is only used as a guide, and Chengdu Yibaite
Electronic Technology Co., Ltd. makes every effort to provide accurate information in this
manual, but Chengdu Yibaite Electronic Technology Co., Ltd. does not guarantee that the
content of this manual is completely free of errors, and all statements, information and
Suggestions in this manual do not constitute any express or implied warranty.
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1. Overview
1.1 Introduction
E49-400T20S is an ultra-high cost-effective wireless module launched
by Chengdu Ebyte. It has 4 operating modes. Each transmission mode has its
own characteristics and can be applied to various application scenarios.
E49-400T20S can perfectly support industrial-grade applications, and
undergoes rigorous testing at the factory to ensure its industrial reliability
and batch consistency.
The E49-400T20S supports a maximum transmission power of 20dBm.
Users can set a lower output power to save power consumption. The module
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works at 433MHz, with TTL level output, and is compatible with 3.3V. The module has data encryption function. The
data transmitted by the module in the air is random. Through strict encryption and decryption algorithms, the data
interception is meaningless, the probability of interference is reduced, and the reliability and transmission efficiency are
improved. Besides, it is a low-cost wireless serial transceiver module.
1.2 Features
The measured communication distance can reach 2.5km;
The global license-free [ISM 433MHz frequency band;
Data transmission rate :1. 2Kbps~200Kbps;
Low power consumption mode, suitable for battery application;
GFSK modulation;
2.3V~5.5V power supply;
1.3 Application Scenario
Wearable devices;
Security system, Positioning system;
Wireless remote control, unmanned drone;
Health care product;
Wireless voice, wireless headphones;
Automobile industry application.
Copyright ©2012-2019, Chengdu Ebyte Electronic Technology Co.,Ltd.
Industrial-grade standard design, support long-term use of -40 ~ 85°C;
Maximum transmit power is 100mW, software can be adjusted in multiple stages;
Support stamp hole and IPEX interface, users can choose to use according to their needs.

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2. Specification and parameter
2.1 Limit parameter
Performance
Main parameter Remark
Min. Max.
Voltage over 5.5V will cause permanent
Power supply (V) 0 5.5
damage to module
) Chances of burn is slim when modules
Blocking power (dBm) - 10 ] }
are used in short distance
Operating temperature (°C) -40 85
2.2 Operating parameter
Performance
Main parameter Remark
Min. Typ. Max.
Operating voltage (V) 23 5 5.5
Co For 5V TTL, it may be at risk of burning
Communication level (V) 33
down
Operating temperature (°C) -40 - 80 Industrial design
Operating frequency (MHz) 410 433 510 Support ISM band
TX current (mA) 91 Instant power consumption
Power
RX current (mA) 12
consumption
Sleep current (nA) 0.7 Software 1s shut down
Max Tx power (dBm) - - 20.0
Receiving sensitivity (dBm) -116 -118 -119 Air data rate 1s1 .2kbps
Air data rate (bps) 1.2k 24k 200k Controlled via user’s programming
Main parameter Description Remark
Test condition : clear and open area, antenna gain:
Distance for reference 2500m ) ) )
5dBi,antenna height:2.5m, air data rate:1.2kbps
FIFO 54 Byte Maximum capacity of single transmission
Cache capacity 500 Byte
Modulation GFSK
Communication interface UART serial port
Package SMD
Connector 127mm
Size 26*16mm
Antenna IPEX/Stamp hole 50 ohm impedance
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3. Size and pin definition
16.0+0.1mm 3.23£0.1mm
| 2.00
12 n I n 12
1.27
13 10 | | 10 13
14 9 1 9 14
15 8 1 8 15
16 7 1 7 16
I= 17 6 1 6 17
£E =
p= 18 5 | 5 18
pd 19 4 I 4 19
12
20 3 | 3 20
H 127
21 IPX 2 | | | 2 2
22 1 1 22
TT [140
0.50 0.90
Top pad: 0501=)] [0.80 Bottom pad: 0.501_) | ] 0.80
Weight: 2.0g
Pad quantity ; 22
Unit: mm
No. Name Direction Function
1 GND Module ground wire
2 GND Module ground wire
3 GND Module ground wire
4 GND Module ground wire
5 MO Input (pull up when | Cooperate with M1 to determine 4 operating modes of the module(can be lifted
it’s weak) floating, the module contains pull-up resistor)
. ML Input (pull up when | Cooperate with MO to determine 4 operating modes of the module(can be lifted
it’s weak) floating, the module contains pull-up resistor)
7 RXD Input TTL serial input, connect to external TX) output pin,
8 TXD Output TTL serial input, connect to external RXD output pin,
Used to indicate the working status of the module; the user wakes up the external
9 AUX Output ) oo
MCU and outputs a low level during the power-on self-test initialization
Module power supply positive reference, voltage range: 2.6V ~ 5.5V DC
10 vee p ppLy p 2 g
11 GND Module ground wire
12 NC
13 GND Module ground wire
14 NC
15 NC
16 NC
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17 NC
18 NC
19 GND Module ground wire
20 GND Module ground wire
21 ANT antenna
22 GND Module ground wire
4. Recommended wiring diagram
Ul MCU
19 18
—9 PC1 PCO O—>—
—9 PC4 PB7 O—5— 5 x
— 9 PAO PB6 © 15 a QQ Mo "
— PA1 PB5 O — Q M1 3
— 9 PA2 USART_RX O 1 A O RXD 2
—9 PA3 USART_TX O 12 QQ TXD =
gO vss PB4 O—3 5 J AUX | <
—0 vp PBI O—— °q vee 4
—C0O PBO PB1 O——
VCC GND
Brief introduction of connection between the module and the single-chip microcomputer (the above picture uses
No. STMSL single-chip microcomputer as an example)
| The wireless serial port module is TTL level, please connect with MCU with TTL level.
) Some 5V microcontrollers may require 4 ~ 10K pull-up resistors on the TXD and AUX pins of the module.
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5. Function description
5.1 Module reset
After the module is powered on, AUX will immediately output a low level and perform a hardware self-test and set
the operating mode according to user parameters. In this process, AUX is kept at a low level, outputs a high level after
completion, and starts to work normally according to the working mode composed of M1 and MO. Therefore, users need
to wait for the rising edge of AUX as the starting point for the normal operation of the module.
5.2 AUX detailed explanation
AUX is used for wireless sending and receiving buffer indication and self-inspection indication.
It indicates whether the data of the module that has not been transmitted through the wireless, or whether it has
received wireless data that has not been transmitted through the serial port, or the module is in the process of initial
self-test.
5.2.1 Wireless receiving indication
After receiving the valid wireless data, the module will immediately pull AUX low and start the serial port to output
data and then pull up AUX after the data output is completed.
31s
‘ms A5ms +6ms #7ms A8ms #+9ms lms 42ms 43ms #4ms #5ms Hw qm
1
am— | 1
5.2.2 Wireless transmission indication
After receiving the serial port data, the module will immediately pull down AUX and start sending data wirelessly
and after all the data is sent, pull up AUX.
IF abUms
Ams #2ms A3ms #4ms #5ms #6ms +7ms #+Bms #9ms lms 42ms +H ow gus
10
=
0.44Hz
{2
lo
|
Ti:
FEF
1 #aE
HHH
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5.2.3 Reset and exit sleep mode
Only when resetting and exiting sleep mode
The self-check procedure
happens when the procedure
of power-on reset, instruction
reset and exit mode 3. Mormal operation after self-check
Timing Sequence Diagram of AUX when self-check
5.2.4 AUX Precautions
The function 1 and function 2 mentioned above have low output priority, that is, if any output low condition is met,
AUX outputs a low level; when all low level conditions are not met, AUX outputs a high level.
When the AUX output is low, it indicates that the module is busy, and the operating mode detection will not be
performed; when the AUX output is high, the mode switching will be completed.
When the user enters other modes from mode 3 (sleep mode) or during the reset process, the module will reset the user
parameters, during which AUX outputs low level.
5.2.5 Detailed explanation of fixed-point mode
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» C ~~
x =» AA BB CC
Addons Child
000304 AA BB CC > a
Target address Target channel Data : + No output
Address Channel
Address Channel
=
» No output
¥
Address Channel
5.2.6 Broadcast transmission
»
L » AA BB CC
Poros rd
FF
FFO04
AABB
CC
_,
_
Address Channel Data — >» AA BBR CC
Address
Channel
50
(\N] Addrass Charis)
i
—» No output
Address Channel
5.2.7 Broadcast address
Example:
® Set the address of module A to OXFFFF and the channel to 0x04
® When module A is used for transmission (same mode, transparent transmission mode), all receiving module
under the 0x04 channel can receive data to achieve the purpose of broadcasting.
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5.2.8 Monitor Address
® Example: Set the address of module A to OXFFFF and the channel to 0x04. When module A is used as a receiver,
it can receive all the data under the 0x04 channel to achieve the purpose of monitoring.
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6. Operating mode
The module has four operating modes, which are set by pins MO and M1; details are shown in the table below.
Mode (0-3) Mode introduction Remark
Ml MO
0 The transmission method
oo The senal port opens and wireless on, the module performs of the sender and receiver
Transmission oo ) oo )
J 0 0 data transmission according to the set transmission mode must be consistent
mode
) ) Relative intensity values
1 Wireless off and the serial port opens, the module outputs |
. LL. only
RSSI mode 0 1 RSSI signal strength value at 100ms timing
2 Wireless off, can receive serial port command, refer )
) Parameter configuration
Setting mode 1 0 Command List, fixed baud rate 9600, 8N1
3 The module goes to sleep standby mode, and the serial port
and wireless are turned off. Ultra-lower power sleep
Sleep mode 1 1
6.1 Mode switching
® Users can combine MO and M1 with high and low levels to determine the operating mode of the module. Users
can use the MCUs 2 GPIOs to control the node switching; after changing M0,M1: the module is idle and after
Ims, it can start working according to the new operating mode; if the module has not transmitted serial port
data via wireless, then entering the new operating mode after the transmission completed; if the module
receives the wireless data and sends out the data through the serial port, it needs to finish sending before
entering the new operating mode; if the module; so the mode switching can only be effective when AUX
outputs 1, otherwise the switch will be delayed.
® For example: In mode 0, the user continuously inputs a large amount of data and switches the mode at the
same time. The mode switching operation is invalid at this time; the module will process all the user data
before performing the new mode detection; so the general recommendation is: Detect the AUX pin output
status, wait for 2ms after the AUX output goes high before switching.
® When the module is switched from other modes to sleep mode, if any data has not been processed, the module
will enter the sleep mode after processing the data(including receiving and sending). This feature can be
used for fast sleep mode to save power consumption; for example: the transmitter module works in mode0, the
user initiates serial 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 will immediately sleep, the module will automatically
send all user data through wireless, and automatically enter sleep within 1ms; thus saving the MCU's working
time and reducing power consumption.
® Similarly, any mode switch can use this feature. After processing the current mode event, the module will
automatically enter the new mode within 1ms; thereby eliminating the user's query of AUX and achieving the
goal of fast switching ,For example, switching from the transmission mode to the setting mode; the user MCU
can also go to sleep mode in advance before the mode switching, and use the external interrupt function to
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obtain the AUX change to perform the mode switching.
® This operation mode is very flexible and efficient. It is designed in accordance with the convenience of the
user MCU, and can reduce the workload of the entire system as much as possible, improve system efficiency
and reduce power consumption.
6.2 Transmission mode (Mode0)
Type When MO = 0, M1=0, module working in module0
The module receives user data from the serial port, the maximum length of the wireless data packet
transmitted by the module is 54 bytes, when the amount of user input data reaches 54 bytes, the
module will start wireless transmission. At this time, the user can continue to enter the data that needs
to be transmitted.
When the user needs to transmit less than 54 bytes, the module waits for about 20ms. If there is no
trans user data to continue to input, the data is considered to be terminated. At this time, the module sends
all data via wireless.
When the module receives the first user data, AUX outputs low level. When the module puts all data
into the RF chip and starts transmitting, AUX outputs high level.
ission
At this point, it indicates that the last packet of wireless data has been transmitted, and the user can
continue to enter data.
Data packets sent through mode 0 can only be received by the receiving module in mode O.
The module is on the wireless receiving function all the time and can receive data packets from mode
0.
receivi | After receiving the data packet and the module AUX outputs a low level, it starts sending wireless
ng data through the serial port TXD pin. After all wireless data is output through the serial port, the
module outputs AUX high level.
6.3 RSSI Mode (Model)
Type When M1= 0, M1 =0, module working in modulel
transmi | No wireless transmission is allowed, the received serial data will be discarded.
ssion
Can not receive air wireless data, only scan the signal strength of the current channel, and output a
| strength value (relative value) through the serial port every 100ms.
receivi
Numerical calculation method: signal strength =-(256 (decimal)-data (decimal)) dBm
ng
If the hexadecimal value output by the serial port is 0x91, the actual signal strength 1s:~(256
(decimal)-145 (decimal)) =-111dBm
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6.4 Setting Mode (Mode2)
Type When MO = 0, M1 = 1, module working in modulel
Co No wireless transmission is allowed, the received serial data will be discarded.
transmission
receiving Unable to receive wireless data
Can be used for module parameter setting, use serial port 9600, 8N1, set module working
configuration parameters according to specific instruction format
When entering from the setting mode to other modes, the module will reconfigure the
parameters. During the configuration, AUX remains low level,
It outputs a high level after finished, so it is recommended that the user detect the rising edge
of AUX.
6.5 Sleep Mode (Mode3)
Type When MO=1, MI =1, module working in module3
transmi oo
) Unable to transmit wireless data
ssion
receivi ) )
Unable to receive wireless data
ng
When the module is in the ultra-low power state, all other functions of are turned off, and the sleep
others | mode can only be exited through the state switch of M1MO.
6.6 Fast communication test
Step Specific operation
Connect E49-400T20S module to the E49-TBL test board, and then plug into the USB test board (E15-USB-T2),
| plug into the computer to ensure that the driver has been installed correctly;
Plug in the mode selection jumper cap on the USB test board ( M1 = 0, MO = 0),
) Select 5V (the module supports 2.6 ~5.5V).
Run the "Serial Debug Assistant" software and select the correct serial port number and observe the sending
3 window and the corresponding receiving window
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7. Command format
Command mode (Mode 2: MO = 0, M 1 = 1), the list of supported commands is as follows (when set, only 9600, 8N1
format is supported):
No. Instruction format Detailed description
) Send CO + 5 byte working parameters in hexadecimal format, a total of 6 bytes and
CO+operating )
1 must be sent continuously (save when power off)
parameter
Send three Cls in hexadecimal format. The module returns the saved parameters and
2 Cl1+Cl1+C1 must be sent continuously.
) Send C2 + 5 bytes working parameter in hexadecimal format, a total of 6 bytes and
C2+operating )
3 must be sent continuously(do not save when power off)
parameter
Send three C3s in hexadecimal format. The module returns version information and
4 C3+C3+C3 must be sent continuously.
7.1 Default parameters
Model Factory default parameter value: CO 00 00 19 2E 00
Module type Frequency | Address Channel Air rate Baud rate Transmitting power
E49-400T20S | 433MHz | 0x0000 0x2E 2.4kbps 9600 20
7.2 Reading operating parameter
Instruction format Detailed description
In the setting mode (MO = 0, M1 = 1), issue a command to the module
serial port (HEX format): C1 C1 Cl,
CI+C1+C1 The module will return the current configuration parameters,
such as: C0 00 00 18 20 00
7.3 Reading version number reading
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Instruction format Detailed description
C3+C3+C3
(HEX format): C3 C3 C3,
In the setting mode (MO = 0, M1 = 1), issue a command to the module serial port
The module will return the current configuration parameters, such as: C3 49 xx yy;
49 here represents the module model (E49 series), xx is the version number, and yy
refers to other features of the module (users can ignore).
7.4 Parameter setting instruction
No. Item Description Remark
Fix 0xCO or 0xC2, it means this frame data is control | ® Must be 0xCO or 0xC2
0 HEAD command CO: Save the parameters when power-down
C2: Do not save the parameters when
power-down
High address byte of module 00H-FFH
1 ADDH ( the default 00H )
) ADDL Low address byte of module O0OH-FFH
( the default 00H )
Rate parameters, including serial rate and air rate
7, 6: Serial parity bit
00: 8N1 (default) UART baud
01: 801 rate can be different between
10: 8F1 communication parties
The UART baud rate has nothing to do with
11: §N1 wireless transmission parameters & won't
affect the wireless transmit / receive
features.
3 SPED 5,4,3 TTL senal speed (bps) .
000: Serial baud rate 1s 1200
001: The senal port baud rate 1s 2400
010: The senal port baud rate 1s 4800
011: Serial baud rate 1s 9600 (default)
100: The serial port baud rate is 19200
101: Serial baud rate 1s 38400
110: Serial baud rate 1s 57600
111: Serial baud rate is 115200 ® The lower the air data rate, the longer
the transmitting distance, better
anti-interference performance and
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2,1,0 Wireless air rate (bps)
000: The air rate 1s 1.2k
010: The air speed 1s 4.8k
011: The air speed is 9.6k
100: The air speed 1s 19.2k
101: The air speed 1s 50k
110: The air speed 1s 100k
111: 200k air speed
001: The air speed 1s 2.4k (default)
longer transmitting time
The air data rate must keep the same
for both communication parties.
7,,6,5,4,3,2,1, 0Communication channel
Communication frequency (410M + CHAN * 0.5M)
1, 0 Transmission power (approximation)
00: 20 dBm (default)
01: 17 dBm
10: 14 dBm
11:10 dBm
The external power must make sure the
ability of current output more than 1A and
ensure the power supply ripple within
100mV.
Low power transmission is not
recommended due to its low power supply
efficiency.»
4 CHAN
(Default 0x2E: 433M) 00H-C8H ,
correspond to410~510 MHz
In fixed transmission mode, the first
three bytes of each user's data frame
7, Fixed transmission enabling bit ( similar to MODBUS ) can be used as high/low address and
0: Transparent transmission mode channel. The module changes its
1 © Fixed transmission mode address and channel when transmit.
And it will revert to original setting
6,5,4,3,2 Reserved bit, write 0 after complete the process.
5 OPTION
For example: The meaning of No.3 "SPED" byte:
The binary bit of the
byte 7 6 5 4 2 1 0
Configures by user 0 0 0 1 0 0 1
Meaning UART parity bit §N1 UART baud rate 1s 9600 Air data rate is 2.4k
Corresponding 1 9
hexadecimal
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8. Hardware design
® [tis 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) ;
® 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.
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