Ebyte E31-433T17D1B User manual

E31-433T17D1B User Manual
AX5243 433MHz DIP Wireless Module

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
Contents
1. OVERVIEW.................................................................................................................................. 2
1.1 INTRODUCTION..............................................................................................................................................................4
1.2 FEATURES......................................................................................................................................................................4
1.3 APPLICATION.................................................................................................................................................................4
2. SPECIFICATIONS..........................................................................................................................5
2.1 LIMIT PARAMETERS....................................................................................................................................................... 5
2.2 WORKING PARAMETERS................................................................................................................................................ 5
3. SIZE AND PIN DEFINITION........................................................................................................6
4. CONNECT TO MCU.......................................................................................................................7
5 FUNCTION DESCRIPTION...........................................................................................................8
5.1 FIXED TRANSMISSION....................................................................................................................................................8
5.2 BROADCASTING TRANSMISSION.................................................................................................................................... 8
5.3 BROADCASTING ADDRESS............................................................................................................................................. 8
5.4 MONITOR ADDRESS....................................................................................................................................................... 9
5.5 RESET............................................................................................................................................................................9
5.6 AUX DESCRIPTION........................................................................................................................................................ 9
5.6.1 Indication of UART output.................................................................................................................................... 9
5.6.2 Indication of wireless transmitting........................................................................................................................ 9
5.6.3 Configuration procedure of module.................................................................................................................... 10
5.6.4 Notes for AUX...................................................................................................................................................... 10
6 OPERATING MODE.....................................................................................................................11
6.1 MODE SWITCHING....................................................................................................................................................... 11
6.2 NORMAL MODE（MODE 0）...................................................................................................................................... 11
6.3 WOR MODE（MODE 1）........................................................................................................................................... 12
6.4 POWER SAVING MODE（MODE 2）.............................................................................................................................12
6.5 SLEEP MODE（MODE 3）...........................................................................................................................................12
7 COMMAND FORMAT................................................................................................................. 13
7.1 FACTORY DEFAULT PARAMETER..................................................................................................................................13
7.2 WORKING PARAMETER READING.................................................................................................................................13
7.3 VERSION NUMBER READING........................................................................................................................................ 13
7.4 RESET INSTRUCTION....................................................................................................................................................13
7.5 PARAMETER SETTING INSTRUCTION............................................................................................................................ 14

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 2
8 HARDWARE DESIGN.................................................................................................................. 15
9 FAQ.................................................................................................................................................. 16
9.1 TRANSMISSION DISTANCE IS NOT IDEAL......................................................................................................................16
9.2 MODULE IS EASY TO DAMAGE.....................................................................................................................................17
9.3 BIT ERROR RATE IS TOO HIGH......................................................................................................................................17
10 WELDING OPERATION GUIDANCE..................................................................................... 17
11 E31 SERIES...................................................................................................................................17
12 ANTENNA INSTRUCTION.........................................................................................................18
12.1 ANTENNA RECOMMENDATION................................................................................................................................... 18
13 BATCH PACKAGING METHOD............................................................................................. 19
REVISE HISTORY............................................................................................................................19
ABOUT US......................................................................................................................................... 20

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 3
Disclaimer
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including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 4
1. Overview
1.1 Introduction
E31-433T17D1B is a 433M SMD wireless serial port
module (UART) with AXSEM AX5243 RF chip imported from
Switzerland, half duplex, transceiver integrated, transparent
transmission mode, 425~450.5MHz frequency band (default
433MHz), TTL level output with air wake-up function (ultra low
power consumption).
The module has a FEC forward error correction algorithm,
which has high coding efficiency and strong error correction capability. In the case of sudden interference, it can actively
correct the interfered data packets, greatly improving reliability and transmission distance. In the absence of FEC, such
packets can only be discarded. The module has data encryption and compression function. The data transmitted by the
module in the air is random, and the data interception is meaningless through strict encryption and decryption algorithms.
The data compression function has the probability of reducing the transmission time, reducing the probability of
interference, improving reliability and transmission efficiency.
E31-433T17D1B strictly abides by FCC, CE, CCC and other domestic and foreign design specifications, meets all
RF related certifications, and meets export requirements.
1.2 Features
The real testing distance reaches 2km;
The max transmitting power is 50mW, multi-level is adjustable via the software;
Support global license-free ISM 433MHz band;
Support data transmission rate from 1.2kbps to 70kbps;
Support low power mode, suitable for battery applications;
Supports 2.3V~5.2V power supply, and more than 2.3V power supply can guarantee the best performance;
Support advanced ultra-narrow band GFSK modulation.
Industrial grade standard design, support for long-term use from -40 to 85 °C;
SMA interface, easy connection of coaxial 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;
Intelligent agriculture and oilfield solutions;
health care products;
Advanced Meter Reading Architecture (AMI);
Automotive industry applications.

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
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2. Specifications
2.1 Limit parameters
Main parameter
Performance
Remark
Mini. value
Max. value
supply voltage（V）
0
5.2
The module will be burnout
permanently with over 5.5V
Blocking power（dBm）
-
10
There’s small probability of burning
module at close range use
Operating temperature（℃）
-40
85
2.2 Working parameters
Main parameter
Performance
Remark
Mini.
value
Typical value
Max.
value
supply voltage（V）
2.3
3.3
5.2
≥3.3V 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
Working frequency（MHz）
425
-
450.5
Support ISM band
Power
consumption
Transmit current(mA）
70
Instant power consumption
Receive current（mA）
13
Sleep current（μA）
4
Software is shut down
Max. transmit power（dBm）
16.6
17.0
18.4
Receiving sensitivity（dBm）
-125
-126
-127
Air data rate is 1.2kbps
Air data rate（bps）
1.2k
5k
70k
Controlled via user’s programming
Main parameter
Description
Remark
Distance for reference
2000m
Test condition：clear and open area, antenna gain: 5dBi，
antenna height: 2.5m，air data rate: 1.2kbps
subcontracting method
43 Byte
The max capacity for each packet
Buffer
512 Byte
Modulation
GFSK
Communication interface
TTL
@3.3V
Package
DIP
Connector
2.54mm
Size
21*36mm
Antenna
SMA-K
50 ohm impedance

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
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3. Size and pin definition
No.
Name
Direction
Function
1
M0
Input
（Weak pull-up）
Work with M1 to decide 4 working modes of module (not suspended, if
not used, could be grounded).
2
M1
Input
（weak pull-up）
Work with M0 to decide 4 working modes of module (not suspended, if
not used, could be grounded).

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 7
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 push-pull output (suspending is allowed).
6
VCC
Input
Power supply ：2.1~ 5.5V DC
7
GND
Input
Ground
8
Fixed orifice
Fixed orifice
9
Fixed orifice
Fixed orifice
10
Fixed orifice
Fixed orifice
4. Connect to MCU
No.
Description（STM8L MCU）
1
The UART module is TTL level，pls connect to the MCU of TTL..
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
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5 Function description
5.1 Fixed transmission
5.2 Broadcasting transmission
5.3 Broadcasting address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;

Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T17D1B User Manual
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When module A works as transmitter (same mode, transparent transmission), all the receivers with 0x04 channel
can receive the data, to realize the broadcast transmission.
5.4 Monitor address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
When module A is the receiver, it can receive the data sent from all modules under channel 0x04, the purpose of
monitor is realized.
5.5 Reset
When the module is powered, 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.
5.6 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.
5.6.1 Indication of UART output
To wake up external MCU
5.6.2 Indication of wireless transmitting
Buffer (empty): the internal 512 bytes data in the buffer are written to the RFIC (Auto sub-packaging).