EBYTE E90-DTU 2.4GHz LoRa Modem User Manual

: June 6, 2024
: ebyte

Table of Contents

Introduction
Features
Operation
Installation Specification
Interface Definition
Technical indicators
Operating Mode
Connection diagram when programming
Practical application
Important statement
References
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E90-DTU (433C33)
Chengdu Ebyte Electronic Technology Co,; Ltd
E90-DTU (433C33) user manual

Introduction

1.1. Brief Introduction
E90-DTU (433C33) is a data transmission station that adopts extremely advanced ultra-narrow band modulation technology. On the original basis, power amplifier (PA) and low noise amplifier (LNA) are built-in, so that the maximum transmitting power reaches 0.5w and the receiving sensitivity is also improved to a certain extent. Compared with the products without power amplifiers and low noise amplifiers, the overall communication stability is greatly improved.
Different from the traditional data transmission station, E90-DTU (433C33) is specially developed for Modbus application scenarios. The feature of unlimited packet length can replace the communication cable, making it the most convenient choice for Modbus wireless upgrade. The station works in the 433MHz frequency band, with a communication distance up to 4km. Wireless digital radio as a medium of communication, as well as optical fiber, microwave, open wire, there is a certain scope of application: it provides some special conditions, private network monitoring signals in real-time and reliable data transmission, low cost, easy installation and maintenance, diffraction capability is strong, flexible network structure, the coverage is far characteristic, suitable for some more and occasions, such as dispersion and complex geographical environment with PLC, RTU, rain gauge, level gauge and other data terminal is connected.
1.2. Certificate
E90-dtu has obtained the “radio transmission equipment model approval certificate”, whose approval code is CMIIT ID:2017FP5780
E90-DTU has obtained the “explosion-proof certificate”, whose number is: test no. 201711000975
E90-dtu has obtained the “electrostatic surge detection report” issued by the China testing institute, whose number is CNEx18.1461.
E90-dtu has obtained the “appearance design patent certificate”, and its patent number is ZL 2016 3 0501980.3.
E90-DTU has obtained the “utility model patent certificate”, and its patent number is ZL 2016 2 1410691.3.
E90-dtu has obtained the “CE certificate” (mandatory eu certification), whose verification number is CCISE180514601V.
E90-DTU has obtained an “FCC certificate” with the ID of 2ALPH-E90-DTU.
E90-DTU has obtained the “RoHS certificate” (mandatory EU environmental protection certification), and its report number is DTI201807025245.

Features

All the core components of the original import, compared with the current similar imported digital radio, the most advanced function, the smallest size, the best price.
The infinite packet length, supports uninterrupted transmission, Modbus adaptation.
Tailored for Modbus, all direct replacement of RS-485 cable.
Simple and efficient power supply design, support power supply device or line pressure mode, support 10~28V power supply.
Transmission power up to 1w, and multi-level adjustable, all technical indicators up to the European industrial standards.
Temperature compensators are adopted to make the frequency stability better than ±1.5PPM.
Operation temperature range: -40 +85, applicable for various harsh environments, it is real industrial-grade products
All aluminum alloy shell, compact size, easy installation, good heat dissipation; Perfect shielding design, good electromagnetic compatibility, strong anti-interference ability.
Power reverse connection protection, over-connection protection, antenna surge protection, and other multiple protection functions, greatly increase the reliability of the station.
Powerful software functions, all parameters can be set through programming: such as power, frequency, airspeed, address ID, etc
Ultra-low power consumption, the standby current is only 31mA (power-saving mode and sleep mode power consumption is lower), the emission current is 0.9A.
Built-in watchdog, and accurate time layout, once an exception, the module will automatically restart, and can continue to work in accordance with the previous parameter Settings.

Operation

Main parts

The first step is to mount the antenna, then the battery, making sure the dial switch is on its right status. The user gets on the power by choosing either VCC/GND or power adapter.
Using USB-(RS232) converter or USB-RS(485) converter or another way to link computer and DTU.
Firing up two XCOMs, choosing Baud rate 9600bps, 8N1, the setting which serial port transmission can be achieved.
The user needs to open the mode switch first before linking DTU with the computer if the user wants to modify parameters. Firing up E90-DTU (E90-DTU parameter configuration application) to modify related parameters. The mode switch must be reopened to achieve transmission after the configuration.

Installation Specification

3.1. Structure

Pin NO.	Name	Function	Description
1	DB-9 female socket	RS-232 interface	Standard RS-232 interface
2	3.81 terminal block	RS-485, power interface	Standard RS-485 interface and

3.2. Dimension

Interface Definition

4.1. Power interface definition

Users can choose DC power interface, using the power adapter supply with the interface of the 5.5mm outer diameter, 2.5mm diameter ;
Also, choose the VCC and GND terminal power supply, only choosing any one of the power supplies is OK; E90-DTU can use a 10~ 28V DC power supply, but it is recommended to use a 12V or 24V DC power supply.
4.2. RS232 Interface definition
The E90-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
4.3. RS485 Interface definition
E90-DTU can connect the 485_A terminal and 485_B terminal with the device RS-485 A terminal and B terminal.

P in NO.	Definition	Function	Description
I	VCC	Crimping power interface, positive	10 — 28V DC, recommended 12V or

Note: The transceiver will be in poor communication when connected to multiple devices , it is recommended to be connected to a single device, please try to use parallel 120 resistors between 485_A terminal and 485_B.

Technical indicators

5.1. Model specifications

Model	Frequency	Transmit power	Distance	Specifications	Application
Hz	W	km
E90-DTU (433C33)	433M	2	4	Continuous transmission, support Modbus

Suitable for large data volume applications, support Modbus.

Note: Test condition: in clear and open-air without shelters, 12V /2A power supply, 5dBi gain sucker antenna over 2 meters height from the ground, with the factory default parameters.

NO.

| Model| Specification|

Description

---|---|---|---
1| Size（HWD）| 82 62 25 mm| See more at 3.2 Dimension
2| Weight| 130g| Tolerance: 4.5g
3| Temperature| -40℃～85℃| Meet industrial level
4| Antenna impedance| 50 Ω| Standard 50 Ω characteristic impedance
5| Supply voltage| +10 ~ +28V DC| It is recommended to use 12V or 24V
6| Communication interface| RS232/RS485| Standard DB9 hole / 3.81 terminal block
7| Baud rate| Default 9600| from 1200 to 115200 bps
8| Address| Default 0| 65536 configurable addresses

5.2. Frequency range and channels

Model	Default frequency	Frequency range	Channel spacing	Channels
Hz	Hz	Hz
E90-DTU (433C33)	433M	425~450.5M	100K	256， half-duplex

Note: In the same area when multiple data transceivers are communicating one to one at the same time, it is recommended to set the channel spacing between each group of data transceivers at 2MHz or more.

5.3. Transmit power level

Mode	2W	1W	500mW	250mW
E90-DTU (433C33)	√	√	√	√

Note: The lower the transmit power, the closer the transmission distance, but the working current won’t be declined in exact proportion, it is recommended to use the maximum transmit power.

5.4. Air data rate

Model	Default air data rate	Levels	Air data rate(bps)
bps	bps
E90-DTU(433C33)	N/A	N/A	Unadjustable, the airspeed will automatically

adjust to the baud rate

Note: The higher the air data rate, the faster the transmission rate, the transmission distance is also closer; when the rate meets the requirements, the lower air data rate, the better quality.

5.5. Current parameters

Model

| Transmitting current mA| Standby current mA
---|---|---
12V| 24V| 12V| 24V
E90-DTU (433C33)| 938| 417| 31| 24

Note: It is recommended to retain more than 50% of the current margin when selecting the power supply, which will help the data transceiver to work steadily for a long time.
5.6. Transceiver Length and Sub-packing Mode

Model	Buffer	Sub-package
E90-DTU(433C33)	Single input unlimited (baud rate ≤57600)	Continuous

transmission, no subcontracting

Note:

If the data received by the station in a single time is larger than the capacity of a single packet, the excess data will be automatically allocated to the second transmission until the completion of the transmission.
The data transceiver cannot receive data that is more than the buffer capacity;

Operating Mode

E90-DTU(230C27) has four operating modes, if low power consumption is not required, normal communication is recommended to configure the data transceiver for the normal mode (mode 0); The factory default is normal mode (mode 0).

| Categories| M1| M0| Description
---|---|---|---|---
Mode 0| Normal Mode| ON| ON| Serial port open, wireless open, transparent transmission (factory default mode)
Mode 1| Retained mode| ON| OFF| Nonsense, both serial and wireless are disabled
Mode 2| Command mode| OFF| ON| The radio can be programmed using the configuration software
Mode 3| Sleep Mode| OFF| OFF| The module enters hibernation and the serial port and module are closed

Note: no need to care about the wake-up mode (mode 1) and power-saving mode (mode 2) if it doesn’t request low power consumption.

Connection diagram when programming

7.1. Diagrammatic drawing

| Mode| M1| M0| Description
---|---|---|---|---
Mode 3| Command mode| Off| Off| Only be programmed using the configuration software in the current mode

Note:
1. programming can only be carried on in a specific mode (see above), if fails, please confirm the work mode. 2.If there’s no complicated programming, opening the E90-DTU (E90-DTU parameter configuration application) to modify parameters.
7.2. Parameter setting instruction

Parameter

|

Description

---|---
Baud rate| The serial port baud rate of a wireless data station at work is 1200bps～115200bps。
Odd-even check| Support 8N1:no check；8E1:even-check；8O1:odd-check； Both are 8-bit data bits and 1-bit stop bits.
Air data rate（bps）| Wireless communication rate, also known as air baud rate air rate high, data transmission speed, the transmission of the same data time delay is small, but the transmission distance will become shorter.
Transmitting power| In order to ensure working efficiency, it is recommended to use the maximum power. If the transmitted power is reduced, the communication distance will become shorter and the required current will be reduced
FEC| The lost or interfered data can be partially corrected by complex encoding, which can improve the equivalent receiving sensitivity by about 3dBm. Turning off this function can reduce the communication delay.
Transmission mode| Fixed length transmission: automatic subcontracting in traditional wireless transmission mode, with a maximum of 77 bytes per packet. Continuous transmission: unlimited packet length, supporting wireless continuous transmission.
Wake Up Time| There is no direct relationship with the communication delay. If the customer needs low-power applications, this option shall be adjusted as required. In the power-saving mode, the longer the wake-up time, the lower the power consumption of the receiving end, and the greater the communication delay.
Station Address| Internal address of wireless data station, stations with the same address as those independent of Modbus address can communicate with each other. This feature can be used to realize software filtering grouping input range:0~65535, decimal number.
Frequency Channel| It is equivalent to the working frequency of the wireless data transmission station. Each channel corresponds to its different working frequency. Theoretically, different frequency channels cannot communicate with each other， If there are multiple groups of wireless data stations in the same area, the communication frequency interval is suggested to be 2~5MHz.
Cipher function| Only stations with the same ciphertext can communicate, and the secondary ciphertext can only be written but cannot be read.
Ciphertext set| Radio ciphertext, input range :0 ~ 65535, decimal number.

8. Connection diagram in test and application

9. E90 Series

Mode No.

Function feature

---|---|---|---|---|---
E90-DTU(170L30)| RS232 RS485| 170M| 30| 8| LoRa spread spectrum, ultra- strong through diffraction
E90-DTU(433L30)| RS232 RS485| 433M| 30| 8| LoRa spread spectrum, long distance, anti -interference
E90-DTU(433L37)| RS232 RS485| 433M| 37| 20| LoRa spread spectrum, 20km long distance, anti- interference
E90-DTU(433C30)| RS232 RS485| 433M| 30| 3| High-speed continuous transmission, supportModBus protocol
E90-DTU(433C33)| RS232 RS485| 433M| 33| 4| High-speed continuous transmission, supportModBus protocol
E90-DTU(433C37)| RS232 RS485| 433M| 37| 10| High-speed continuous transmission, support Modbus protocol, long-distance
E90-DTU(230N27)| RS232 RS485| 230M| 27| 5| Low-frequency narrow band, suitable for complex environment
E90-DTU(230N33)| RS232 RS485| 230M| 33| **** 8| Low-frequency narrow band, suitable for complex environment
E90-DTU(230N37)| RS232 RS485| 230M| 37| 15| Low-frequency narrow band, suitable for the complex environment, super diffraction

Practical application

The data transceiver of CDEBYTE is applied for all kinds of point to point, one point to multiple points wireless data transmission systems, such as smart home, Internet of things transformation, power load monitoring, distribution network automation, hydrological and hydrological forecasting, water pipe network monitoring, urban street lamps Monitoring, air defense alarm control, railway signal monitoring, centralized control of railway water supply, oil supply pipe network monitoring, GPS system, remote meter reading, electronic crane, automatic reporting, seismic forecasting, fire prevention, environmental monitoring, and another industrial automation system, as shown below:

11. Note

Please keep the warranty card of the equipment which includes the factory number (and important technical parameters) and is important for the user’s future maintenance and new equipment.
Transceiver during the warranty period, if the quality of the product itself rather than man-made damage or lightning and other natural disasters caused by damage, enjoys free warranty; please do not repair by yourself, the problem and please contact with our company when problem occurring, we offer the first-class after-sales service.
Please do not operate the transceiver in some flammable places such as coal mines or near explosive atmospheres (such as detonators).
Please use the appropriate DC power supply, high-frequency interference ability, small ripple, and enough load capacity are required; it’s better to have over-current, over-voltage protection and lightning protection, and other functions to ensure that transceiver working properly.
Please do not use it in the working environment beyond the transceiver environmental characteristics, such as high temperature, humidity, low temperature, strong electromagnetic fields or dust larger environment.
Please do not continuously keep the transceiver transmitting in full capacity, or the transmitter might be damaged.
Please connect the ground with the external ground of the power supply (such as PC, PLC, etc.) , otherwise, it is easy to burn out the communication interface; do not plug the interface with the power supply.
When testing, please connect the antenna or 50 loads, otherwise transceiver will be damaged easily;the distance from the antenna is better than 2 meters, so as to avoid harm, please do not touch the antenna when transmitting.’
Wireless data transceiver has different communication distance in different environments, communication distance is influenced by temperature, humidity, obstacle density, obstacle volume and electromagnetic environment; in order to ensure stable communication, it is recommended to reserve at least 50 % of the communication distance.
When communication distance is not perfect, it is recommended to improve the antenna quality and the installation mode of the antenna. You can send mail to support@cdebyte.com for support.
When choosing a power supply, it is recommended to keep at least 50% current left and the ripple must not exceed 100mV.

Important statement

CDEBYTE reserves the right of final interpretation and modification of all the contents of this manual.
As the hardware and software products continuously improve, this manual may be subject to change without notice, please refer to the latest version.
Everyone is responsible for protecting the environment: to reduce the use of paper, we only provide electronic documents of the English manual, if necessary, please go to our official website to download; In addition, for special requirements, we agree to offer a certain amount of documents according to order quantity, not every data transceiver are supplied with one manual, please understand;

Revision history

version

| Date| Description|

Issued by

---|---|---|---
1.2| 2019-04-12| initial version| Molly
1.3| 2020-10-14| initial version| ly
1.4| 2020-1-27| initial version| ly

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