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E51 Series
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Ebyte E51 Series, E51-TTL-500, E51-TTL-50, E51-TTL-2W User Manual

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Page 1
AX5043 Wireless Module
E51 Series
All rights to interpret and modify this manual belong to Chengdu Ebyte Electronic Technology Co., Ltd.
User Manual
Page 2
AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 2 / 21
Version
Date
Description
Issued by
1.00
2017/12/13
Initial version
huaa
Brief Introduction
E51 series wireless transceiver modules, operate at 225~237.6MHz (Default: 230MHz) with transparent transmission available, TTL
level, WOR (ultra-low power consumption). They feature half duplex and DIP interface.
The module has the function of data encryption & compression. The data of the module transmitted over the air features
randomness. With the rigorous encryption & decryption, data interception becomes pointless. The function of data compression decreases
the transmission time & probability of being interfered, while improving the reliability & transmission efficiency.
E51 series strictly stick to the design rules home and abroad of FCC, CE, CCC and meet the related RF certifications and export
standards.
Model
Frequency
Transmitting power
Distance
Packing
Antenna
E51-TTL-50
230M
17dBm
2000m
DIP
SMA-K
E51-TTL-500
230M
27dBm
4000m
DIP
SMA-K
E51-TTL-2W
230M
33dBm
8000m
DIP
SMA-K
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 3 / 21
Contents
1. Features ..................................................................................................................................................... 5
2. Technical Parameters ........................................................................................................................... 5
2.1 Electrical Parameters ................................................................................................................................................. 6
2.1.1 Transmitting Current ............................................................................................................................................................ 6
2.1.2 Receiving Current .................................................................................................................................................................. 6
2.1.3 Turn-off Current .................................................................................................................................................................... 6
2.1.4 Voltage Supply ....................................................................................................................................................................... 6
2.1.5 Communication Level ........................................................................................................................................................... 7
2.2 RF Parameters ............................................................................................................................................................. 7
2.2.1 Transmitting Power ............................................................................................................................................................... 7
2.2.2 Receiving Sensitivity .............................................................................................................................................................. 7
2.2.3 Recommended Working Frequency ................................................................................................................................ 7
2.3 Tested Parameters ..................................................................................................................................................... 8
2.3.1 Tested Distance ...................................................................................................................................................................... 8
3. Mechanical Characteristics ................................................................................................................ 8
3.1 E51-TTL-50 .................................................................................................................................................................. 8
3.1.1 Dimension ................................................................................................................................................................................ 8
3.2.1 Dimension ................................................................................................................................................................................ 9
3.3 E51-TTL-2W .............................................................................................................................................................. 10
3.3.2 Pin Definition ........................................................................................................................................................................ 11
5. Function Description .......................................................................................................................... 12
5.2 Broadcast Transmission .......................................................................................................................................... 12
5.4 Monitor Address ...................................................................................................................................................... 12
5.6 AUX Description ....................................................................................................................................................... 13
5.6.2 Indication of Wireless Transmitting .............................................................................................................................. 13
5.6.4 Notes for AUX ...................................................................................................................................................................... 14
6.1 Mode Switch ............................................................................................................................................................. 14
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 4 / 21
6.2 Normal Mode（Mode 0） ..................................................................................................................................... 15
6.3 Wake-up Mode（Mode 1） .................................................................................................................................. 15
6.4 Power-saving Mode（Mode 2） ......................................................................................................................... 15
6.5 Sleep Mode (Mode 3) ............................................................................................................................................. 16
7. Instruction Format .............................................................................................................................. 16
7.1 Default Parameter .................................................................................................................................................... 16
7.2 Reading Operating Parameters ............................................................................................................................ 17
7.3 Reading Version Number ....................................................................................................................................... 17
7.4 Reset Instruction ...................................................................................................................................................... 17
7.5 Parameter Setting Instruction ............................................................................................................................... 17
8. Parameter Setting ............................................................................................................................... 19
9. Production Guidance ......................................................................................................................... 19
9.1 Reflow Soldering Temperature ............................................................................................................................ 19
9.2 Reflow Soldering Curve .......................................................................................................................................... 20
10. FAQ .......................................................................................................................................................... 20
10.1 Communication range is too short ................................................................................................................... 20
10.2 Module is easy to damage .................................................................................................................................. 20
11. Important Notes ................................................................................................................................ 21
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 5 / 21
1. Features
l Strong ability of diffraction: 230M features in low frequency, long wave length and strong ability of diffraction. It is applicable
in complicated environment.
l Narrow band transmission: Narrow band features high density, long transmitting distance and strong anti-interference ability.
At same transmitting power, the transmitting distance is much longer than that of others.
l Ultra-low power consumption: It supports WOR, which suits for battery power supply. In power-saving mode (Mode 2), the
overall power consumption can be regulated by setting receiving response delay and its maximum is 2000ms. The average current
is about 30uA.
l Fixed transmission: Module can communicate with other modules which work in different channels and addresses. It makes
networking and repeater easy. For example: module A transmits AA BB CC to module B (address: 0x00 01, channel: 0x80). The HEX
format is 00 01 80 AA BB CC (00 01 refers to the address of module B, and 80 refers to the channel of module B). Then module B
receives AA BB CC (only module B).
l Broadcast transmission: When the module address is set as 0xFFFF, the module can communicate with other modules in the
same channel.
l FEC: Forward Error Correction has high coding efficiency & good correction performance. In case of sudden interference, it can
correct the interfered data packets proactively, so that the reliability & transmission range are improved correspondingly. Without
FEC, those data packets can only be dropped.
l Sleep mode: When the module works in sleep mode (Mode 3), it is available for configuration, but not for transmitting & receiving.
environment including working plant, factory, warehouse, office building and community.
Model
IC
Size
Net weight
Operating
temperature
Operating
humidity
Storage
temperature
E51-TTL-50
AX5043
21*36mm
6.7±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E51-TTL-500
AX5043
24*43mm
8.5±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E51-TTL-2W
AX5043
37*60mm
25±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 6 / 21
2.1 Electrical Parameters
2.1.1 Transmitting Current
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
59
64
70
mA
● When designing current supply circuit, 30% margin is
recommended to be remained so as to ensure long-term
stable operation of the whole module.
● The current at the instant of transmitting may be high, but
the total energy consumed may be lower due to very short
transmitting time.
● When using external antenna, the impedance matching
degree at different frequency points between antenna and
module may affect the transmitting current value at
different levels.
E51-TTL-500
290
320
350
mA
E51-TTL-2W
948
1030
1140
mA
2.1.2 Receiving Current
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
10
11
12
mA
● The current consumed when the RF chip is only working
at receiving mode is called as receiving current，the tested
receiving current may be higher for some RF chips with
communication protocol or the developers have loaded
their own protocol to the whole module.
● The current at pure receiving mode will be mA level, the
users have to realize µA level receiving current through
firmware development.
E51-TTL-500
10
11
12
mA
E51-TTL-2W
14
15
17
mA
2.1.3 Turn-off Current
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
3.0
4.0
5.0
µA
● The turn-off current means the current consumed by CPU,
RAM, Clock and some registers which remain operating.
SoC is at very low power consumption status.
● The turn-off current is always lower than the current
consumed when the power supply source of the whole
module is at no-load status.
E51-TTL-500
4.0
5.0
6.0
µA
E51-TTL-2W
4.0
5.0
6.0
µA
2.1.4 Vo l t a g e Supply
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
2.3
3.3
5.2
V DC
● If the module stays at maximum voltage for a long time, it
may be damaged.
● The power supply pin has certain surge-resistance ability,
but the potential pulse higher than the maximum power
supply voltage.
●The power supply is not advisable to be below 3.0V, or
the RF parameters will be influenced at different degree.
E51-TTL-500
3.3
5.0
5.2
V DC
E51-TTL-2W
3.3
5.0
5.2
V DC
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
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2.1.5 Communication Level
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
2.5
3.3
3.6
V DC
●If the module stays at maximum communication level for a long time,
it may be damaged.
● Modules are compatible with some microcontrollers at 5V
communication level. Please refer to practical test or contact us for
more information.
E51-TTL-500
2.5
3.3
3.6
V DC
E51-TTL-2W
2.5
3.3
3.6
V DC
2.2 RF Parameters
2.2.1 Transmitting Power
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
16
17
18
dBm
● Due to the error of the materials, each LRC component has ±0.1%
error, so error accumulation will occur since multiple LRC
components are used in the whole RF circuit, and the transmitting
currents will be different at different modules.
● The power consumption can be lowered by lowering the
transmitting power, but the efficiency of the internal PA will be
decreased by lowering transmitting power due to various reasons;
● The transmitting power will be lowered by lowering the power
supply voltage.
E51-TTL-500
26
27
28
dBm
E51-TTL-2W
32
33
34
dBm
2.2.2 Receiving Sensitivity
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
-125
-126
-127
dBm
● The sensitivity is tested under the air data rate 1.3kbps.
● Due to the error of the materials, each LRC component has ±0.1%
error, so error accumulation will occur since multiple LRC
components are used in the whole RF circuit, and the transmitting
currents will be different at different modules.
●The receiving sensitivity will be reduced and communication range
will be shortened while increasing the air data rate.
E51-TTL-500
-125
-126
-127
dBm
E51-TTL-2W
-125
-126
-127
dBm
2.2.3 Recommended Working Frequency
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
225.0
230.0
237.6
MHz
● To work within the recommended frequency can assure the
modules to meet all the parameters.
● To avoid the crowded integral frequency like 433.0MHz 、
868.0MHz、915MHz etc. is advisable.
E51-TTL-500
225.0
230.0
237.6
MHz
E51-TTL-2W
225.0
230.0
237.6
MHz
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 8 / 21
2.3 Tes ted Parameters
2.3.1 Tested Distance
Model
Min
Typ
Max
Unit
Remarks
E51-TTL-50
1800
2000
2200
m
● The external antenna used is of 2.5dBi gain and vertical
polarization. The height is 2.5 meters.
● The interval between each data packet is 2s, sending 100
packets with 30 bytes in each packet, the range at data lose
rate of lower than 5% is valid range.
● In order to obtain meaningful and reproducible results,
we conducted the tests under in clear weather with little
electromagnetic interference at suburb areas.
● Distance may be shorter with interference or obstacles.
E51-TTL-500
3600
4000
4400
m
E51-TTL-2W
7200
8000
8800
m
3. Mechanical Characteristics
3.1 E51-TTL-50
3.1.1 Dimension
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 9 / 21
3.1.2 Pin Definition
Pin No.
Pin item
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 in di ca te mo du l e’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
Input
Power supply 2.1V-5.5V DC
7
GND
Input
Ground electrode
8
Fixing hole
Fixing hole
9
Fixing hole
Fixing hole
10
Fixing hole
Fixing hole
3.2 E51-TTL-500
3.2.1 Dimension
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 10 / 21
3.2.2 Pin Definition
Pin No.
Pin item
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 in di ca te mo du l e’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
Input
Power supply 2.8V-5.5V DC
7
GND
Input
Ground electrode
8
Fixing hole
Fixing hole
9
Fixing hole
Fixing hole
10
Fixing hole
Fixing hole
3.3 E51-TTL-2W
3.3.1 Dimension
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
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3.3.2 Pin Definition
Pin No.
Pin item
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 in di ca te mo du l e’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
Input
Power supply 4.75V-5.25V DC
7
GND
Input
Ground electrode
8
Fixing hole
Fixing hole
9
Fixing hole
Fixing hole
10
Fixing hole
Fixing hole
4. Recommended Circuit Diagram
No.
Description（STM8L MCU）
1
The UART module is TTL level. Please connect to MCU of TTL level.
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
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5. Function Description
5.1 Fixed Transmission
5.2 Broadcast Transmission
5.3 Broadcast Address
l For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
l When module A is the transmitter (transparent transmission), all modules under channel 0x04 will receive the data, the purpose of
broadcast is realized.
5.4 Monitor Address
l For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
l When module A is the receiver, i t c an receive the data sent from all modules under channel 0x04, the purpose of monitor is realized.
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
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5.5 Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the operating mode on the basis
of the user parameters. During the process, the AUX keeps low level. After the process completed, the AUX outputs high level and starts
to work as per the operating mode combined byM1 and M0. Therefore, the user needs to wait the AUX rising edge as the starting point
of module’s normal work.
5.6 AUX Description
5.6.1 Indication of UART Output
To w ak e u p ex te rn al M CU :
5.6.2 Indication of Wireless Transmitting
Buffer (empty): the internal 512 bytes data in the buffer are written to the RFIC (Auto sub package). When AUX=1, the user can input data
less than 512 bytes continuously without overflow.
Buffer (not empty): when AUX=0, the internal 512 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.
Notes: 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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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
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5.6.4 Notes for AUX
l 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.
l 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.
l After switching to new operating mode, it won’t be work in the new mode immediately until AUX rising edge 2ms later. If AUX is
on the high level, the operating mode switch can be effected immediately.
l 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.
6. Operating Mode
Contents in the table below are the introduction of input status of M1 & M0 and their corresponding mode:
Mode（0-3）
M1
M0
Mode introduction
Remark
Mode 0
Normal
0
0
UART and wireless channel are open, transparent
transmission is on.
The receiver must work in mode
0 or mode 1.
Mode 1
Wake-up
1
0
UART and wireless channel are open. The difference between
normal mode and wake-up mode is it will add preamble code
automatically before data packet transmission so that it can
awaken the receiver works in mode 2.
The receiver can work in mode 0,
mode 1 or mode 2.
Mode 2
Power-saving
0
1
UART is disabled. Wireless module works at WOR mode
(wake on radio). It will open the UART and transmit data after
receiving the wireless data.
1, the transmitter must work in
mode 1.
2, transmitting is not allowed in
this mode.
Mode 3
Sleep
1 1 Parameter setting
See more in operating parameter.
6.1 Mode Switch
l The user can decide the operating mode by the combination of M0, M1 and M2. The two GPIOs of MCU can be used to switch
mode. After modifying M0, M1 or M2, it will start to work in new mode 1ms later if the module is free. If there are any serial data
that are yet to finish wireless transmitting, it will start to work in new mode after the UART transmitting finished. After the module
receives the wireless data & transmits the data through serial port, it will start to work in new mode after the transmitting finished.
Therefore, the mode-switch is only valid when AUX outputs 1, otherwise it will delay.
l For example, in mode 2 or mode 4, if the user inputs massive data consecutively and switches operating mode at the same time,
l If the module switches from other modes to stand-by mode, it will work in stand-by mode only after all the remained data process
external MCU transmits data “12345”, it can switch to sleep mode immediately without waiting the rising edge of the AUX pin,
& go dormancy 1ms later automatically, which reduces MCU working time & save power.
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l Likewise, this feature can be used in any mode-switch. The module will start to work in new mode within 1ms after completing
present mode task, which enables the user to omit the procedure of AUX inquiry and switch mode swiftly. For example, when
switching from transmitting mode to receiving mode, the user MCU can go dormancy before mode-switch, using external interrupt
function to get AUX change so that the mode-switch can be realized.
l This operation is very flexible and efficient. It is totally designed on the basis of the user MCU’s convenience, at the same time the
work load and power consumption of the whole system has been reduced and the efficiency of whole system is largely improved.
6.2 Normal Mode（Mode 0）
Status
When M1 = 0, M0 = 0, module works in mode 0
Transmitting
The module can receive the user data via serial port, and transmit wireless data package of 58 bytes. When the
data inputted by user is up to 58 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 58 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 512 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 1.
Receiving
The wireless receiving function of the module is on, the data packet transmitted from the module working in
mode 0 & mode 1 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.
6.3 Wake-up Mode（Mode 1）
Status
When M1 = 0, M0 = 1, 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 add preamble code before each data packet automatically.
The preamble code length depends on the wake-up time set in the user parameters.
The purpose of the preamble code is to wake up the receiving module that works in mode 2. Therefore, the data
package transmitted from mode 1 can be received by module in mode 0, mode1 and mode 2.
Receiving
The same as that in mode 0.
6.4 Power-saving Mode（Mode 2）
Status
When M1 = 1, M0 = 0, module works in mode 2
Transmitting
UART is closed, the module cannot receive any serial port data from outside MCU.
Hence the function of wireless transmission is not available for the module working in this mode.
Receiving
In mode 2, it is required the data transmitter works in mode 1.
The wireless module monitors the preamble code at regular time.
Once it gets the preamble code, it will remain as receiving status and waiting for the completion of receiving
the entire valid data package.
Then the AUX outputs low level, 5ms later the serial port is open to transmit received wireless data through
TXD. Finally， AUX outputs high level after process completed.
The wireless module stays in “power-saving – monitoring” working status (polling).
By setting different wake-up time, the module will have different receiving response delay (2s in maximum) and
average power consumption (30uA in minimum).
The user needs to achieve a balance between communication delay time & average power consumption.
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6.5 Sleep Mode (Mode 3)
Status
When M1=1, M0=1，module works in mode 3
Transmitting
N/A
Receiving
N/A
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. (Please refer to parameters setting for details)
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.
7. Instruction Format
In sleep mode（Mode 3：M0=1, M1=1,）, it supports instructions below.
(Only support 9600 and 8N1 format when setting)
No.
Instruction format
Illustration
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 Parameter
Default parameter values：C0 00 00 18 19 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E51-TTL-50
230MHz
0x0000
0x19
1.2kbps
9600
8N1
50mW
Default parameter values：C0 00 00 18 19 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E51-TTL-500
230MHz
0x0000
0x19
1.2kbps
9600
8N1
500mW
Default parameter values：C0 00 00 18 19 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E51-TTL-2W
230MHz
0x0000
0x19
1.2kbps
9600
8N1
2W
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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 19 44.
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 51 xx yy.
51 here means the module model (E51 series); xx is the version number and yy refers to the other module
features.
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 Instruction
No.
Item
Description
Remark
0
HEAD
Fix 0xC0 or 0xC2, it means this frame data is control command
l Must be 0xC0 or 0xC2
C0: Save the parameters when power-down
C2: Do not save the parameters when power-down
1
ADDH
High address byte of module（Default 00H）
00H-FFH
2
ADDL
Low address byte of module（Default 00H）
00H-FFH
3
SPED
7
6
UART parity bit
UART mode can be different between communication
parties
0
0
8N1（Default）
0
1
8O1
1
0
8E1
1
1
8N1（Equal to 00）
5 4 3
TTL UART baud rate（bps）
l UART baud rate can be different between
communication parties
l The UART baud rate has nothing to do with
wireless transmission parameters & won’t affect
the wireless transmit / receive features.
0 0 0
1200bps
0 0 1
2400bps
0 1 0
4800bps
0 1 1
9600 bps（Default）
1 0 0
19200bps
1 0 1
38400bps
1 1 0
57600bps
1 1 1
115200bps
2 1 0
Air date rate（bps）
l The lower the air date rate, the longer the
transmitting distance, better anti-interference
performance and longer transmitting time
l The air date rate must keep the same for both
communication parties.
0 0 0
1.2kbps（Default）
0 0 1
2.4kbps
0 1 0
4.8kbps
0 1 1
9.6kbps
1 0 0
19.2kbps
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
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1 0 1
38.4kbps
1 1 0
50kbps
1 1 1
70kbps
4
CHAN
7 6 5
N/A
l 0 Recommended.
Communication channel
l 00H-3FH（64 communication channels） 225 ~
237.6MHz
5-0（225M + CHAN * 0.2M）, Default 19H：230MHz
5
OPTION
7
Fixed transmission（Similar to MODBUS）
l 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
1
Fixed transmission mode
6
IO drive mode(Default 1)）
l 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 and AUX open-collector outputs, RXD open-collector
inputs
5 4 3
Wireless wake-up time
l The transmit & receive module work in mode 0,
whose delay time is invalid & can be arbitrary
value.
l The transmitter works in mode 1 can transmit the
preamble code of the corresponding time
continuously.
l When the receiver works in mode 2, the time
means the monitor interval time (wireless wake-
up). Only the data from transmitter that works in
mode 1 can be received.
0 0 0
250ms（Default）
0 0 1
500ms
0 1 0
750ms
0 1 1
1000ms
1 0 0
1250ms
1 0 1
1500ms
1 1 0
1750ms
1 1 1
2000ms
2
FEC switch
l After turn off FEC, the actual data transmission
rate increases while anti-interference ability
decreases. Also the transmission distance is
relatively short.
l Both communication parties must keep on the
same pages about turn-on or turn-off FEC.
0
Turn off FEC
1
Turn on FEC（Default）
1
0
Tra ns mission po we r (Appro xi ma tion)
l For E51-TTL-50
l The external power must make sure the ability of
current output more than 150mA and ensure the
power supply ripple within 100mV.
l Low power transmission is not recommended due
to its low power supply efficiency.
0
0
17dBm（Default）
0
1
14dBm
1
0
10dBm
1
1
7dBm
1
0
Tran sm is si on power ( Ap proxi ma ti on )
l For E51-TTL-500
l The external power must make sure the ability of
current output more than 0.6A and ensure the
power supply ripple within 100mV.
l Low power transmission is not recommended due
to its low power supply efficiency.
0
0
27dBm（Default）
0
1
24dBm
1
0
21dBm
1
1
18dBm
1
0
Tran sm is si on power ( Ap proxi ma ti on )
l For E51-TTL-2W
l The external power must make sure the ability of
current output more than 2A and ensure the
0
0
33dBm（Default）
0
1
30dBm
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
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1
0
27dBm
power supply ripple within 100mV.
l Low power transmission is not recommended due
to its low power supply efficiency.
1
1
24dBm
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 2.4k
Corresponding hexadecimal 1 A
8. Parameter Setting
When the module is in Mode 3 (M0=1 M1=1), the parameter can be set by instruction or software in PC.
Please visit www.cdebyte.com to download the software.
9. Production Guidance
9.1 Reflow Soldering Temperature
Profile Feature
Sn-Pb Assembly
Pb-Free Assembly
Solder Paste
Sn63/Pb37
Sn96.5/Ag3/Cu0.5
Preheat Temperature min （Tsmin）
100℃
150℃
Preheat temperature max (Tsmax)
150℃
200℃
Preheat Time (Tsmin to Tsmax)(ts)
60-120 sec
60-120 sec
Average ramp-up rate(Tsmax to Tp)
3℃/second max
3℃/second max
Liquidous Temperature (TL)
183℃
217℃
Time（tL）Maintained Above（TL）
60-90 sec
30-90 sec
Peak temperature（Tp）
220-235℃
230-250℃
Aveage ramp-down rate（Tp to Tsmax）
6℃/second max
6℃/second max
Time 25℃ to peak temperature
6 minutes max
8 minutes max
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9.2 Reflow Soldering Curve
10. FAQ
10.1 Communication range is too short
l The communication distance will be affected when obstacle exists.
l Data lose rate will be affected by temperature, humidity and co-channel interference.
l The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground.
l Seawater has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea.
l The signal will be affected when the antenna is near metal object or put in a metal case.
l Power register was set incorrectly, air data rate is set as too high (the higher the air data rate, the shorter the distance).
l The power supply low voltage under room temperature is lower than the recommended value, the lower the voltage, the lower the
transmitting power.
l Due to antenna quality or poor matching between antenna and module.
10.2 Module is easy to damage
l Please check the power supply source, ensure it is within the recommended value, voltage higher than that will damage the module.
l Please check the stability of power source, the voltage cannot fluctuate too much.
l Please make sure antistatic measure are taken when installing and using, high frequency devices have electrostatic susceptibility.
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AX5043 Wirel ess Modu le User Manual of E51 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 21 / 21
11. Important Notes
l All rights to interpret and modify this manual belong to Ebyte.
l This manual will be updated based on the upgrade of firmware and hardware, please refer to the latest version.
l Please refer to our website for new product information
12. About Us
Te ch ni ca l su p po rt : support@cdebyte.com
Documents and RF Setting download link: www.cdebyte.com/en/
Te l：+86-28-61399028 Ext. 812
Fax：028-64146160
Web：www.cdebyte.com/en/
Address：Innovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China
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