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E34-2G4H27D
User Manual
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Ebyte E34-2G4H27D User Manual

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E34-2G4H27D User Manual
nRF24L01+ 2.4GHz TTL Auto Frequency Hopping Module
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Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co., Ltd
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CONTENTS
1.OVERVIEW ........................................................................................................................................... 3
1.1 INTRODUCTION ....................................................................................................................................................................................... 3
1.2 FEATURES ................................................................................................................................................................................................ 3
1.3 APPLICATION ........................................................................................................................................................................................... 3
2.SPECIFICATION AND PARAMETER ............................................................................................ 4
2.1 LIMIT PARAMETER ................................................................................................................................................................................. 4
2.2 OPERATING PARAMETER ....................................................................................................................................................................... 4
3 SIZE AND PIN DEFINITION ............................................................................................................. 5
4 CONNECT TO MCU ............................................................................................................................ 6
5 FUNCTION DESCRIPTION .............................................................................................................. 6
5.1 FIXED TRANSMISSION............................................................................................................................................................................ 6
5.2 RESET ....................................................................................................................................................................................................... 7
5.3 AUX DESCRIPTION ................................................................................................................................................................................ 7
5.3.1 Indication of UART output
.......................................................................................................................................................... 7
5.3.2 Indication of wireless transmitting
........................................................................................................................................... 7
5.3.3 Configuration procedure of module
......................................................................................................................................... 8
5.3.4 Notes for AUX
................................................................................................................................................................................ 8
6 OPERATING MODE ............................................................................................................................ 9
6.1 MODE SWITCH .......................................................................................................................................................................................... 9
6.2 FIXED FREQUENCY MODE (MODE 0) ................................................................................................................................................. 9
6.3 FREQUENCY HOPPING MODE (MODE 1) .......................................................................................................................................... 10
6.4 RESERVATION MODE (MODE 2) ........................................................................................................................................................ 10
6.5 SLEEP MODE (MODE 3) ...................................................................................................................................................................... 10
6.6 QUICK COMMUNICATION TEST ......................................................................................................................................................... 11
7. INSTRUCTION FORMAT ............................................................................................................... 12
7.1 DEFAULT PARAMETERS ...................................................................................................................................................................... 12
7.2 READING OPERATING PARAMETERS ................................................................................................................................................ 12
7.3 READING VERSION NUMBER ............................................................................................................................................................. 12
7.4 RESET INSTRUCTION ........................................................................................................................................................................... 13
7.5 PARAMETER SETTING COMMAND .................................................................................................................................................... 13
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8. HARDWARE DESIGN ..................................................................................................................... 14
9 FAQ ........................................................................................................................................................ 15
9.1 COMMUNICATION RANGE IS TOO SHORT......................................................................................................................................... 15
9.2 MODULE IS EASY TO DAMAGE .......................................................................................................................................................... 15
9.3 BER(BIT ERROR RATE) IS HIGH....................................................................................................................................................... 16
10 PRODUCTION GUIDANCE .......................................................................................................... 16
11 E34 SERIES ........................................................................................................................................ 16
12 ANTENNA RECOMMENDATION ............................................................................................... 16
13 PACKAGE FOR BATCH ORDER ................................................................................................. 17
REVISION HISTORY ........................................................................................................................... 18
ABOUT US ............................................................................................................................................... 18
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1.Overview
1.1 Introduction
E34 (2G4H27D) is a 500mW wireless transceiver module, which
operates at 2.4-2.518GHz. The outstanding advantages of this module
is concentrated power densities, long transmission range, automatic
frequency hopping and TTL level, compatible with 3.3V and 5V.
With auto frequency hopping communication, the module has a
good anti-interference ability with low latency, even if there are some
frequency interference, it still can communicate on the undisturbed
frequency point.
1.2 Features
Support automatic frequency hopping, greatly improve communication anti-interference ability; Support fixed frequency communication, fast transmission speed and low latency; Support automatic packet retransmission after packet loss; Support fixed-point transmission, easy to start network communication; Built-in PA+LNA with 500mW power，communication distance tested is up to 5km; It works at ISM 2.4GHz; Air data rate:250k～2Mbps； With advanced GFSK modulation； Support 3.3V~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； With SMA-K connector, easy connection of IPEX cable or external antenna.
1.3 Application
Home security alarm and remote keyless entry； Smart home and industrial sensors； Wireless alarm security system； Building automation solutions； Wireless industrial-grade remote control； Health care products； Advanced Meter Reading Architecture(AMI)； Automotive industry applications.
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2. 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）
3.3
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）
2400 - 2518
Power
consumption
Transmitting current
[mA]
400
Instant power consumption
Receiving current
[mA]
21
Turn-off current [μA]
510
Software is shut down
Max Tx power（dBm）
26.5
27.0
27.5
Receiving sensitivity（dBm）
-101
-102
-103
Air data rate is 250kbps
Air data rate（bps）
250k
250k
2M
The higher the rate, the lower the distance
Main parameter
Description
Remark
Distance for reference
5000m
Test condition：clear and open area, antenna gain: 5dBi，antenna height:
2.5m，air data rate: 250kbps
TX length
27 Byte
Maximum capacity of single package
Buffer
256 Byte Modulation
GFSK
Communication interface
UART
TTL level
Package
DIP
Connector
2.54mm
Size
21*36mm
Antenna
SMA-K
50 ohm impedance
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3 Size and pin definition
NO
Pin
Pin direction
Pin application
1
M0
Input
（weak pull-up）
Work with M1 & decide the four operating modes.
Floating is not allowed, can be ground.
2
M1
Input
（weak pull-up）
Work with M0 & decide the four operating modes.
Floating is not allowed, can be ground.
3
RXD
Input
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be configured as open-drain or pull-up input.
4
TXD
Output
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be configured as open-drain or push-pull output
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. Can be configured as open-drain output or push-pull output (floating is allowed).
6
VCC
Power supply 3.3V-5.5V DC
7
GND
Input
Ground
8
Fixing hole
Input
Fixing hole
9
Fixing hole
Fixing hole
10
Fixing hole
Fixing hole
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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.
5 Function description
5.1 Fixed transmission
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5.2 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.
5.3 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
5.3.1 Indication of UART output
To wake up external MCU
5.3.2 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.
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5.3.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode
5.3.4 Notes for AUX
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.
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.
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.
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.
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6 Operating mode
There are four operating modes set via pin M0 and M1, see details below：
Mode（0-3）
M0
M1
Mode introduction
Remark
Mode 0
Fixed frequency
mode
0
0
UART and wireless channel are open, transparent transmission is on.
The receiver must work in mode 0 or mode 2
Mode 1
Frequency
hopping mode
1
0
The difference from Mode 0 is: the frequency will change in send &receive process according to certain algorithm rules, the scope is not limited to the basic frequency of user setting, the module has a specific spread sequence.
The receiver must work in mode 1
Mode 2
Reservation mode
0 1 Reservation mode
Same with mode 0
Mode 3
Sleep
1 1 Parameter setting
6.1 Mode switch
Users can combine M1 and M0 for high and low levels to determine the operating mode.
Two mode 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 wirelessly, the new operating mode can be entered after the transmission is completed;
If the module receives wireless data and sends out data through the serial port, it needs to be sent before entering the new working mode. Therefore, the mode switch can only be valid when the AUX output is 1, otherwise the switch will be delayed.
For example, in mode 0 or mode 1, the user continuously inputs a large amount of data and simultaneously performs mode
switching, and the switching mode operation at this time is invalid; The module will process all user data before performing new mode detection;
Therefore, the general recommendation is to detect the output state of the AUX pin and wait for 2ms to switch after the AUX output is high.
6.2 Fixed Frequency Mode (Mode 0)
Type
When M1 = 0 & M0 = 0, module works in mode 0
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Transmitti
ng
The module can receive the user data via serial port, and transmit wireless data package of 27 bytes. When the data inputted by user is up to 27 byte, the module will start wireless transmission. During which the user can input data continuously for transmission. When the required transmission bytes are less than 27 bytes, the module will wait 3-byte time and treat it as data termination unless continuous data inputted by user. Then the module will transmit all the data through wireless channel. When the module receives the first data packet from user, the AUX outputs low level. After all the data are transmitted into RF chip and transmission is started , AUX outputs high level. At this time, it means that the last wireless data package transmission is started, which enables the user to input another 256 bytes continuously. The data package transmitted from the module working in mode 0 can only be received by the module working in mode 0 or 2.
Receiving
The wireless receiving function of the module is on, the data packet transmitted from the module working in mode 0 & mode 2 can be received. After the data packet is received, the AUX outputs low level, 5ms later the module starts to transmit wireless data through serial port TXD pin. After all the wireless data have been transmitted via serial port, the AUX outputs high level.
Notes
Module can not receive data when transmitting and can not transmit data when receiving.
6.3 Frequency hopping mode (Mode 1)
Type
When M0 = 1，M1 = 0，module works in mode 1.
Transmitting
The condition of data packet transmission & AUX function is the same as mode 0. The only difference is that the module will according to certain algorithm rules, the frequency will change in send &receive process, the scope is not limited to the basic frequency of user setting, the module has a specific spread sequence. Therefore, the data package transmitted from mode 1 can be received by mode 1.
Receiving
The same as that in mode 0.
Notes
Module can not receive data when transmitting and can not transmit data when receiving.
6.4 Reservation mode (Mode 2)
Type
When M0 = 0，M1 = 1，module works in mode 2.
Transmitting
The same as that in mode 0.
Receiving
The same as that in mode 0.
6.5 Sleep mode (Mode 3)
Type
When M0 = 1，M1 = 1，module works in mode 3.
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Transmitting
Cannot send data
Receiving
Cannot receive data
Parameter setting
This mode can be used for parameter setting. It uses serial port 9600 & 8N1 to set module working parameters through specific instruction format.
Notes
When the mode changes from stand-by mode to others, the module will reset its parameters, during which the AUX keeps low level and then outputs high level after reset completed. It is recommended to check the AUX rising edge for user.
6.6 Quick communication test
Steps
Operation
1
Plug the USB test board (E15-USB-T2) into computer, make sure the driver is installed correctly. Plug mode-select jumper in the USB test board (M1 = 0，M0 = 0), make the module work in mode 0.
2
Optional power supply, 3.3V or 5V (it supports 3.3V ~ 5.5V).
3
Operate AccessPort software and select the correct serial port code.
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7. Instruction format
In sleep mode（mode 3：M1=1, M0=1）, it supports below instructions.
( Only support 9600 and 8N1 format when setting)
No.
Instruction format
Description
1
C0+working parameters
C0 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and must be sent in succession. ( Save the parameters when power-down )
2
C1 +C1 +C1
Three C1 are sent in hexadecimal format. The module returns the saved parameters and must be sent in succession.
3
C2+working parameters
C2 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and must be sent in succession. (Do not save the parameters when power-down )
4
C3 +C3 +C3
Three C3 are sent in hexadecimal format. The module returns the version information and they must be sent in succession.
5
C4+ C4 +C4
Three C4 are sent in hexadecimal format. The module will reset one time and they must be sent in succession.
7.1 Default parameters
Default parameter values：C0 00 00 18 00 40
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E34-2G4H27D
2.4GHz
0x0000
0x00
250kbps
9600
8N1
500mW
7.2 Reading operating parameters
Instruction format
Description
C1+C1+C1
In sleep mode（M0=1，M1=1）， User gives the module instruction (HEX format): C1 C1 C1, Module returns the present configuration parameters.
For example, C0 00 00 18 00 40.
7.3 Reading version number
Instruction format
Description
C3+C3+C3
In sleep mode（M0=1，M1=1）, User gives the module instruction (HEX format): C3 C3 C3,
Module returns its present version number, for example C3 34 xx yy. 32 here means the module model (E34 series); xx is the version number and yy refers to the other module features.
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7.4 Reset instruction
Instruction format
Description
C4+C4+C4
In sleep mode（M0=1，M1=1）, User gives the module instruction (HEX format): C4 C4 C4, the module resets for one time.
During the reset process, the module will conduct self-check, AUX outputs low level. After reset completing, the AUX outputs high level, then the module starts to work regularly which the working mode can be switched or be given another instruction.
7.5 Parameter setting command
No.
Item
Description
Remark
0
HEAD
Fix 0xC0 or 0xC2, it means this frame data is control command
Must be 0xC0 or 0xC2 C0: Save the parameters when power-down
C2: Do not save the parameters when power­down
1
ADDH
7, 6, 5, 4: resend times （only valid under mode 0 & 2）
Default 15 times (default F). Lost data will be resent.
When multiple same addresses exist, conflict may occur, please set as 0.
3, 2, 1, 0: high address（default F0H)
Default 0
2
ADDL
Low address of module (default 00H)
00H-0FFH
3
SPED
7
6
UART parity bit
UART mode can be different between communication parties
0
0
8N1 (default)
0
1
8O1
1
0
8 E1
1
1
8N1 (equal to 00)
5 4 3
TTL UART baud rate（bps）
UART baud rate can be different between communication parties;
The UART baud rate has nothing to do with wireless transmission parameters & won’t affect the wireless transmit / receive features.
0 0 0
1200
0 0 1
2400
0 1 0
4800
0 1 1
9600 (default)
1 0 0
19200
1 0 1
38400
1 1 0
57600
1 1 1
115200
2
N/A
0 is recommended
1
0
Air data rate（bps）
The lower the air data rate, the longer the
transmitting distance, the better the anti-
interference performance and the longer the transmitting time;
The air data rate must keep the same for both communication parties.
0
0
250k（default）
0 1 1M
1
0
2M
1
1
2M（same to 10）
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4
CHAN
7、6、5、4 N/A
0 is recommended
3、2、1、0 Communication level
00H～0BH, 12 channels in total；
Fixed frequency mode（Mode 0） 0-5 Communication frequency：2400M + CHAN * 2M 6-11 Communication frequency：2508M + (CHAN-6）* 2M Frequency hopping mode（Mode 1）
0-11 Communication frequency：2412M + CHAN * 2M
5
OPTION
7
Fixed transmission（similar to MODBUS)
In fixed transmission mode, the first three bytes
of each user's data frame can be used as high/low
address and channel. The module changes its
address and channel when transmit. And it will
revert to original setting after complete the process.
0
Transparent transmission mode（default）
1
Fixed transmission mode
6
IO drive mode (default 1)
This bit is used to the module internal pull-up
resistor. It also increases the level’s adaptability
in case of open drain. But in some cases, it may need external pull-up resistor.
1
TXD and AUX push-pull outputs,RXD pull-up inputs
0
TXD、AUX open-collector outputs;RXD open-collector inputs
5、4、3、2 N/A
0 is recommended
1 0 Transmission power (approximation)
The external power must make sure the ability of current output more than 800mA and ensure the power supply ripple within 100mV;
Low power is not recommended for power supply is not effective
0
0
27dBm（Default）
0 1 21dBm
1 0 15dBm
1 1 9dBm
For example: The meaning of No.3 "SPED" byte:
The binary bit of the byte
7 6 5 4 3 2 1
0
Configures by user
0 0 0 1 1 0 1
0
Meaning
UART parity bit 8N1
UART baud rate is 9600
Air data rate is 250k
Corresponding hexadecimal
1
8
8. 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
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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.
9 FAQ
9.1 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
distance).
The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the
transmitting power.
Due to antenna quality or poor matching between antenna and module.
9.2 Module is easy to damage
Please check the power supply to ensure that it is between the recommended power supply voltage. If the maximum
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value is exceeded, the module will be permanently damaged.
Please check the stability of power source, the voltage cannot fluctuate too much. Please make sure anti static measure are taken when installing and using, high frequency devices have electrostatic
susceptibility.
Please ensure the humidity is within limited range, some parts are sensitive to humidity. Please avoid using modules under too high or too low temperature.
9.3 BER(Bit Error Rate) is high
There are co-channel signal interference nearby, please be away from interference sources or modify frequency and
channel to avoid interference.
Poor power supply may cause messy code. Make sure that the power supply is reliable.
The extension line and feeder quality are poor or too long, so the bit error rate is high.
10 Production guidance
This type is DIP module, when the welder welds the module, he must be welding according to the anti-static regulation.
This product is allergic to static, randomly welding the module will have the chance of damaging it permanently.
11 E34 series
Model No.
Core IC
Frequency
Hz
Tx power
dBm
Distance
km
Data Rate
Package
Size
mm
Feature
E34-2G4D20D
nRF24L01+
2.4G
20
2.0
250k～2M
DIP
21 * 36
Full duplex，file transfer
E34-2G4H20D
nRF24L01+
2.4G
20
2.5
250k～2M
DIP
21 * 36
Auto frequency hopping, anti­interference
E34-2G4H27D
nRF24L01+
2.4G
27
5.0
250k～2M
DIP
21 * 36
Auto frequency hopping, anti­interference
12 Antenna recommendation
The antenna is an important role in the communication process. A good antenna can largely improve the
communication system. Therefore, we recommend some antennas for wireless modules with excellent performance and
reasonable price.
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Model No.
Type
Frequency
Gain
Size
Feeder
Interface
Feature
Hz
dBi
mm
cm
TX2400-NP-5010
FPC antenna
2.4G
2.0
10x50 - IPEX
FPC antenna
TX2400-JZ-3
Rubber
antenna
2.4G
2.0
30 - SMA-J
Short straight &omnidirectional
TX2400-JZ-5
Rubber
antenna
2.4G
2.0
50 - SMA-J
Short straight &omnidirectional
TX2400-JW-5
Rubber
antenna
2.4G
2.0
50 - SMA-J
Fixed bending &omnidirectional
TX2400-JK-11
Rubber
antenna
2.4G
2.5
110 - SMA-J
Flexible &omnidirectional
TX2400-JK-20
Rubber
antenna
2.4G
3.0
200 - SMA-J
Flexible &omnidirectional
TX2400-XP-150
Sucker
antenna
2.4G
3.5
150
150
SMA-J
Small sucker antenna
13 Package for batch order
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Revision history
Version
Date
Description
Issued by
v1.0
2018-07-20
Initial version
huaa
v1.1
2019-03-19
Content update
Ray
About us
Technical support: support@cdebyte.com Documents and RF Setting download link: www.ebyte.com Thank you for using Ebyte products! Please contact us with any questions or suggestions: info@cdebyte.com
-----------------------------------------------------------------------------------------------------------­Fax: 028-64146160 Web: www.ebyte.com Address: Innovation Center B333-D347, 4# XI-XIN Road,Chengdu, Sichuan, China
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