Ebyte E32 Series User manual

SX1278 Wireless Module
E32 Series
This manual may be modified based on product upgrade, please refer to the latest version.
All rights to interpret and modify this manual belong to Chengdu Ebyte Electronic Technology Co., Ltd.
Version
Date
Description
Issued by
1.00
2017/11/10
Initial version
huaa
User Manual

SX1278 Wireless Module E32 Series User Manual
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 2/24
Brief Introduction
E32 series are wireless transceiver modules, operate at 410-441MHz (Default: 433MHz), based on originally imported RFIC SX1278
from SEMTECH, transparent transmission is available, TTL level.
The module has the function of data encryption & compression. The data of the module transmitted over the air features
randomness. And with the rigorous encryption & decryption, data interception becomes pointless. The function of data compression can
decrease the transmission time & probability of being interfered, while improving the reliability & transmission efficiency.

SX1278 Wireless Module E32 Series User Manual
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 3/24
CONTENTS:
1. Features.................................................................................................................................................................................... 4
2. Technical parameters........................................................................................................................................................... 5
2.1 General parameters........................................................................................................................................................................................ 5
2.2 Electrical Parameters...................................................................................................................................................................................... 5
2.2.1 Transmitting current................................................................................................................................................................................... 5
2.2.2 Receiving current........................................................................................................................................................................................ 5
2.2.3 Turn-off current.......................................................................................................................................................................................... 6
2.2.4 Voltage supply............................................................................................................................................................................................ 6
2.2.5 Communication level..................................................................................................................................................................................6
2.3 RF parameters..................................................................................................................................................................................................6
2.3.1 Transmitting power.....................................................................................................................................................................................6
2.3.2 Receiving sensitivity.................................................................................................................................................................................... 7
2.3.3 Recommended working frequency...........................................................................................................................................................7
2.4 Tested range.................................................................................................................................................................................................... 7
3. Mechanical characteristics.................................................................................................................................................8
3.1 Dimension........................................................................................................................................................................................................ 8
3.1.1 E32-TTL-100............................................................................................................................................................................................... 8
3.1.2 E32-TTL-100S1........................................................................................................................................................................................... 9
3.1.3 E32-T100S2............................................................................................................................................................................................... 10
3.1.4 E32-TTL-500/ E32-TTL-1W.....................................................................................................................................................................11
3.1.5 E32-433T30S.............................................................................................................................................................................................12
4. Recommended circuit diagram......................................................................................................................................13
4.1 Reset................................................................................................................................................................................................................13
4.2 AUX description............................................................................................................................................................................................ 13
4.2.1 Indication of UART output....................................................................................................................................................................... 13
4.2.2 Indication of wireless transmitting.......................................................................................................................................................... 14
4.2.3 Configuration procedure of module.......................................................................................................................................................14
4.2.4 Notes for AUX........................................................................................................................................................................................... 14
5. Operating mode.................................................................................................................................................................. 15
5.1 Mode switch.................................................................................................................................................................................................. 15
5.2 Normal Mode (Mode 0)...............................................................................................................................................................................16
5.3 Wake-up mode (Mode 1)........................................................................................................................................................................... 16
5.4 Power-saving mode (Mode 2)................................................................................................................................................................... 16
5.5 Sleep mode (Mode 3)...................................................................................................................................................................................17
5.6 Quick communication test.......................................................................................................................................................................... 17
6. Instruction format.............................................................................................................................................................. 18
6.1 Default parameter........................................................................................................................................................................................ 18
6.2 Reading operating parameters.................................................................................................................................................................. 19
6.3 Reading version number............................................................................................................................................................................. 19
6.4 Reset instruction........................................................................................................................................................................................... 19
6.5 Parameter setting instruction.....................................................................................................................................................................19
7. Parameter setting............................................................................................................................................................... 22
8. Production guidance......................................................................................................................................................... 23
8.1 Reflow soldering temperature................................................................................................................................................................... 23
8.2 Reflow soldering curve................................................................................................................................................................................ 23
9. FAQ...........................................................................................................................................................................................24
9.1 Communication range is too short............................................................................................................................................................24
9.2 Module is easy to damage.......................................................................................................................................................................... 24
10. Important notes............................................................................................................................................................... 24
11. About us.............................................................................................................................................................................. 24

SX1278 Wireless Module E32 Series User Manual
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 4/24
1. Features
LoRa: LoRa spread-spectrum means the transmitting distance is much longer than before. Confidentiality is high and the
possibility of being intercepted is extremely low Strong ability of anti-interference, which has a strong inhibitory capacity for the
Co-Channel Interference and all kinds of noises, and with excellent performance of anti multipath fading.
Ultra-low power consumption: It supports WOR to reduce overall power consumption. In power-saving mode(Mode 2), it can
regulate overall power consumption by setting receiving response delay; The maximum receiving response delay can be configured
as 2000ms， and the average current is about 30uA.
Fixed transmission: Module can communicate with other modules which work in different channels and addresses, it is easy for
networking and repeater. For example: module A transmits AA BB CC to module B (address: 0x00 01, channel: 0x80), HEX format is
00 01 80 AA BB CC (00 01 refers to the address of module B, 80 refers to the channel of module B), then module B receives AA BB CC
(only module B).
Broadcast transmission: Set the module address as 0xFFFF, then the module can communicate with other modules in same
channel.
FEC: Forward Error Correction, high coding efficiency & good correction performance. In the 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.
Sleep mode: When the module works in sleep mode (mode 3), transmitting & receiving is not available, while the configuration is
available. The typical current is 6.0uA in this mode.
Watchdog: Module with a built-in watchdog, layout and precise time, once an exception occurs, the module will restart in 0.107
seconds, and will continue to work on the previous parameter Settings.
Parameter saving: The parameters will be saved after setting and won’t be lost when powers-off. After power-up again,
modules work as the previous parameters.
Application: As free frequency, 433M can be used directly. With the capability of penetration and diffraction, this module is
suitable for the environment with small packet, long transmission distance and vulnerable to interference.

SX1278 Wireless Module E32 Series User Manual
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2. Technical parameters
2.1 General parameters
Model
Core IC
Size
Net weight
Operating
temperature
Operating
humidity
Storage
temperature
E32-TTL-100
SX1278
21 * 36 mm
6.7±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E32-TTL-100S1
SX1278
17 * 25.5 mm
1.6±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E32-T100S2
SX1278
17 * 30 mm
1.6±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E32-TTL-500
SX1278
24 * 43 mm
8.2±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E32-TTL-1W
SX1278
24 * 43 mm
8.2±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E32-433T30S
SX1278
25*40.5mm
5.2±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
2.2 Electrical Parameters
2.2.1 Transmitting current
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
100
110
120
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.
E32-TTL-100S1
100
110
120
mA
E32-T100S2
100
110
120
mA
E32-TTL-500
390
410
450
mA
E32-TTL-1W
570
610
670
mA
E32-433T30S
520
550
610
mA
2.2.2 Receiving current
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
13
14
15
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.
E32-TTL-100S1
13
14
15
mA
E32-T100S2
13
14
15
mA
E32-TTL-500
19
20
22
mA
E32-TTL-1W
19
20
22
mA
E32-433T30S
22
23
25
mA

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2.2.3 Turn-off current
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
3
4
5
µA
● The turn-off current means the current consumed when
CPU, RAM, Clock and some registers remain operating
while 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.
E32-TTL-100S1
3
4
5
µA
E32-T100S2
3
4
5
µA
E32-TTL-500
4
5
6
µA
E32-TTL-1W
4
5
6
µA
E32-433T30S
4
5
6
µA
2.2.4 Voltage supply
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
2.3
3.3
5.2
V DC
● If the voltage is at maximum value for long time, the
module may be damaged;
● The power supply pin has certain surge-resistance ability,
but the potential pulse higher than the maximum power
supply voltage;
E32-TTL-100S1
2.3
3.3
5.2
V DC
E32-T100S2
2.3
3.3
5.2
V DC
E32-TTL-500
2.3
3.3
5.2
V DC
E32-TTL-1W
2.3
3.3
5.2
V DC
E32-433T30S
2.3
3.3
5.2
V DC
2.2.5 Communication level
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
2.5
3.3
3.6
V DC
● If the communication level is higher than the allowed
maximum value, the module may be damaged;
● Although the communication level can be switched with
various methods, the power consumption of the whole
module will be affected at great degree.
● Modules are compatible with some of the microcontrollers
at 5V communication level. They are too many to be listed
here. Please base on practical test or talk to us for more
information.
E32-TTL-100S1
2.5
3.3
3.6
V DC
E32-T100S2
2.5
3.3
3.6
V DC
E32-TTL-500
2.5
3.3
3.6
V DC
E32-TTL-1W
2.5
3.3
3.6
V DC
E32-433T30S
2.5
3.3
3.6
V DC
2.3 RF parameters
2.3.1 Transmitting power
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
19.0
20.0
20.4
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.
E32-TTL-100S1
19.0
20.0
20.4
dBm
E32-T100S2
19.0
20.0
20.4
dBm
E32-TTL-500
26.8
27.0
28.0
dBm
E32-TTL-1W
29.5
30.0
30.5
dBm
E32-433T30S
29.5
30.0
30.5
dBm

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2.3.2 Receiving sensitivity
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
-144.0
-146.0
-147.0
dBm
● The sensitivity is tested under the air data rate 0.3kbps，
coding rate of 4/5 and spreading factor of 12;
● 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.
E32-TTL-100S1
-144.0
-146.0
-147.0
dBm
E32-T100S2
-144.0
-146.0
-147.0
dBm
E32-TTL-500
-145.0
-147.0
-148.0
dBm
E32-TTL-1W
-145.0
-147.0
-148.0
dBm
E32-433T30S
-145.0
-147.0
-148.0
dBm
2.3.3 Recommended working frequency
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
410
433
441
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.
E32-TTL-100S1
410
433
441
MHz
E32-T100S2
862
868
893
MHz
E32-TTL-500
862
868
893
MHz
E32-TTL-1W
900
915
931
MHz
E32-433T30S
900
915
931
MHz
2.4 Tested range
Model
Min
Typ
Max
Unit
Remarks
E32-TTL-100
2700
3000
3300
m
● The external antenna used is of 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.
E32-TTL-100S1
2700
3000
3300
m
E32-T100S2
2700
3000
3300
m
E32-TTL-500
4500
5000
5500
m
E32-TTL-1W
7200
8000
8800
m
E32-433T30S
7200
8000
8800
m

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3. Mechanical characteristics
3.1 Dimension
3.1.1 E32-TTL-100
Pin No.
Pin item
Pin direction
Application
1
M0
Input
Work with M1 & decide the four operating modes.
（weak pull-up）
Floating is not allowed, can be ground.
2
M1
Input
Work with M0 & decide the four operating modes.
（weak pull-up）
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
To wake 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
Voltage reference of module
Power supply 2.3V ~ 5.5V DC
7
GND
Input
Ground
8
Fixing hole
Fixing hole
9
Fixing hole
Fixing hole
10
Fixing hole
Fixing hole

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3.1.2 E32-TTL-100S1
Pin No.
Pin item
Pin direction
Application
1
M0
Input
Work with M1 & decide the four operating modes.
（weak pull-up）
Floating is not allowed, can be ground.
2
M1
Input
Work with M0 & decide the four operating modes.
（weak pull-up）
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
To wake 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
Voltage reference of module
Power supply 2.3V ~ 5.5V DC
7
GND
Input
Ground
8
GND
Output
Reference places of high frequency signal output
9
ANT
Output
Antenna interface（high frequency signal output）
10
GND
Input
Ground
11
GND
Input
Ground

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3.1.3 E32-T100S2
Pin No.
Pin item
Pin direction
Application
1
M0
Input
Work with M1 & decide the four operating modes.
（weak pull-up）
Floating is not allowed, can be ground.
2
M1
Input
Work with M0 & decide the four operating modes.
（weak pull-up）
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
To wake 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
Voltage reference of module
Power supply 2.3V ~ 5.5V DC
7
GND
Input
Ground
8
ANT
Output
Antenna interface（high frequency signal output）
9
GND
Output
Reference places of high frequency signal output
10
GND
Input
Ground
11
GND
Input
Ground

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3.1.4 E32-TTL-500/ E32-TTL-1W
Pin No.
Pin item
Pin direction
Application
1
M0
Input
Work with M1 & decide the four operating modes.
（weak pull-up）
Floating is not allowed, can be ground.
2
M1
Input
Work with M0 & decide the four operating modes.
（weak pull-up）
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
To wake 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
Voltage reference of module
Power supply 2.8V ~ 5.5V DC
7
GND
Input
Ground
8
Fixing
hole
Fixing hole
9
Fixing
hole
Fixing hole
10
Fixing
hole
Fixing hole
11
Fixing
hole
Fixing hole

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3.1.5 E32-433T30S
Pin No.
Pin item
Pin direction
Application
1
M0
Input
Work with M1 & decide the four operating modes.
（weak pull-up）
Floating is not allowed, can be ground.
2
M1
Input
Work with M0 & decide the four operating modes.
（weak pull-up）
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
Input
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
Input
Voltage reference of module. Power supply 2.6V ~ 5.5V DC
7
GND
Input
Ground
8
RESET
Input
Reset pin when program is loading（floating，users do not need to connect）
9
GND
Input
Ground pin when program is loading (floating，users do not need to connect）
10
SWIM
Input
SWIM pin when program is loading (floating，users do not need to connect）
11
+3.3V
Input
Power supply pin when program is loading (floating，users do not need to
connect）
12
PB3
Input /Output
NC pin，need to be floating，not connected（for further development）
13
PB1
Input /Output
NC pin，need to be floating，not connected（for further development）
14
PB0
Input /Output
NC pin，need to be floating，not connected（for further development）
15
GND
Ground
16
GND
Ground
17
GND
Ground
18
ANT
Output
Antenna connector(high level output, 50 characteristic impedance)

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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.
4.1 Reset
No.
Description
1
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 by M1 and M0.
Therefore, the user needs to wait the AUX rising edge as the starting point of module’s normal work.
4.2 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
yet to send 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.
4.2.1 Indication of UART output
can be used to wake up external MCU

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4.2.2 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.
4.2.3 Configuration procedure of module
Only happened when power-on resetting or exiting sleep mode.
4.2.4 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 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.
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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5. Operating mode
Contents in below table 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
5.1 Mode switch
The user can decide the operating mode by the combination of M1 and M0. The two GPIO of MCU can be used to switch mode.
After modifying M1 or M0, 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.
For example, in mode 0 or mode 1, if the user inputs massive data consecutively and switches operating mode at the same time, the
mode-switch operation is invalid. New mode checking can only be started after all the user ’ s data process completed. It is
recommended to check AUX pin out status and wait 2ms after AUX outputs high level before switching the mode.
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
completed. The feature can be used to save power consumption. For example, when the transmitter works in mode 0, after the
external MCU transmits data “12345”, it can switch to sleep mode immediately without waiting the rising edge of the AUX pin, also
the user’s main MCU will go dormancy immediately. Then the module will transmit all the data through wireless transmission & go
dormancy 1ms later automatically, which reduces MCU working time & save power.
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.
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 have been reduced and the efficiency of whole system is largely improved.

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5.2 Normal Mode (Mode 0)
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 start , 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.
5.3 Wake-up mode (Mode 1)
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 waking up the receiving module
works in mode 2. Therefore, the data package transmitted from mode 1 can be received by mode 0, mode1 and
mode 2.
Receiving
The same as that in mode 0.
5.4 Power-saving mode (Mode 2)
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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5.5 Sleep mode (Mode 3)
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. (pls 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.
5.6 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.
3
Operate AccessPort software and select the correct serial port code.

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6. Instruction format
In sleep mode（mode 3：M1=1, M0=1）, it supports below instructions on list.
(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.
6.1 Default parameter
Default parameter values：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E32-TTL-100
433MHz
0x0000
0x17
2.4kbps
9600
8N1
100mW
Default parameter values：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E32-TTL-100S1
433MHz
0x0000
0x17
2.4kbps
9600
8N1
100mW
Default parameter values：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E32-T100S2
433MHz
0x0000
0x17
2.4kbps
9600
8N1
100mW
Default parameter values：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E32-TTL-500
433MHz
0x0000
0x17
2.4kbps
9600
8N1
500mW
Default parameter values：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E32-TTL-1W
433MHz
0x0000
0x17
2.4kbps
9600
8N1
1W
Default parameter values：C0 00 00 1A 17 44
Model
Frequency
Address
Channel
Air data rate
Baud rate
Parity
Transmitting
power
E32-433T30S
433MHz
0x0000
0x17
2.4kbps
9600
8N1
1W

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6.2 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, C2 00 00 1A 17 44.
6.3 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 32 xx yy.
32 here means the module model (E32 series); xx is the version number and yy refers to the other
module features.
6.4 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.
6.5 Parameter setting instruction
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 power-down
1
ADDH
High address byte of module
（the default 00H）
00H-FFH
2
ADDL
Low address byte of module
（the default 00H）
00H-FFH
3
SPED
Rate parameter，including UART baud rate and air
data rate
7，6 UART parity bit
00：8N1（default）
01：8O1
10：8E1
11：8N1（equal to 00）
UART mode can be different between
communication parties

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----------------------------------------------
5，4，3 TTL UART baud rate（bps）
000：1200bps
001：2400bps
010：4800bps
011：9600bps（default）
100：19200bps
101：38400bps
110：57600bps
111：115200bps
--------------------------------------------------
2，1，0 Air data rate（bps）
000：0.3Kbps
001：1.2Kbps
010：2.4Kbps（default）
011：4.8Kbps
100：9.6Kbps
101：19.2Kbps
110：19.2Kbps(same to 101)
111：19.2Kbps(same to 101)
-----------------------------------------------------------
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.
------------------------------------------------------------
The lower the air data rate, the longer the
transmitting distance, better anti-interference
performance and longer transmitting time
The air data rate must keep the same for both
communication parties.
4
CHAN
7，6，5： N/A
------------------------------------------------
4-0：Communication channel（410M + CHAN*1M）,
default 17H（433MHz）
0(recommended)
--------------------------------------------------------
00H-1FH, correspond to 410~441MHz
5
OPTION
7， Fixed transmission（similar to MODBUS）
0： Transparent transmission mode
1： Fixed transmission mode
----------------------------------------------------
6 IO drive mode(the default 1)
1：TXD and AUX push-pull outputs,
RXD pull-up inputs
0：TXD、AUX open-collector outputs,
RXD open-collector inputs
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.
------------------------------------------------------------
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.