Ebyte E90-DTU 900SL22-GPRS User manual

E90-DTU (900SL22-GPRS)

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (900SL22-GPRS) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 1
Content
1.OVERVIEW...................................................................................................................................................................... 2
1.1 INTRODUCTION........................................................................................................................................................................... 2
1.2 FEATURES.....................................................................................................................................................................................3
1.3 STATION SYSTEM PARAMETERS.................................................................................................................................................... 4
1.4 PIN DESCRIPTION.........................................................................................................................................................................5
1.5 SIZE..............................................................................................................................................................................................7
2 QUICK START..................................................................................................................................................................8
2.1 HARDWARE PREPARATION AND COMMUNICATION TESTING......................................................................................................... 8
2.2 WORKING MODE AND FUNCTIONS............................................................................................................................................ 14
3 APPLICATION MODEL............................................................................................................................................... 17
4 NOTE............................................................................................................................................................................... 19
5 ABOUT US.......................................................................................................................................................................19

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (900SL22-GPRS) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 2
1.Overview
1.1 Introduction
E90-DTU (900SL22-GPRS) is a data transmission station from radio frequency to GPRS network server, which
realizes the transparent data transmission between sub-1g and GPRS network. The sub-1g radio frequency transceiver is
based on SEMTECH SX1262 radio frequency chip and supports LoRa spread spectrum technology. It is equipped with
high-performance MCU internally, which enables the module to have a variety of transmission modes.At the network end
of GPRS network, the radio supports LTE-FDD/TTE-TDD /WCDMA/ TD-SCDMA /CDMA/GSM wireless
communication data transmission, and supports LTE-FDD, LTE-TDD, dc-HSDPA, HSPA+, HSDPA, HSUPA, WCDMA,
TD-SCDMA, CDMA, EDGE and GPRS network data connection.
E90-DTU (900SL22-GPRS) can be directly connected to the upper computer via USB cable for parameter
configuration, without the need to install the driver, it is easy to change user-defined parameters.
This chapter is a quick introduction to E90-DTU (900SL22-GPRS) products. It builds the simplest hardware
environment to test the network transmission function of E90-DTU (900SL22-GPRS), that is, to realize the two-way
transmission of data from RF module to the network server.

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1.2 Features
Can meet almost all M2M application needs;
Support transparent data transmission, support TCP, UDP network protocol, support heartbeat package,
registration package;
Support serial port caching function, the serial data can be cached to local before establishing connection
with the server;
The maximum downlink rate of GPRS data was 85.6 KBPS, and the maximum uplink rate was 85.6
KBPS.
Software/hardware dual door design, system stability, never crash;
Sub-1g radio frequency;
Support global license-free ISM 868/915mhz frequency band;
Support data transmission rate of 0.3kbps ~ 62.5kbps;
Based on SX1262/1268 development, support the new generation of LoRa technology;
Support RSSI for evaluating signal quality, improving communication network, ranging;
Support LBT, monitor channel environment noise before sending, improve communication success rate;
Industry-standard design, support - 40 ~ 85 ° C for a long time use;
Use USB to connect the computer, no need to install the driver, connected to the computer can be
configured parameters.
Support 8~28V wide voltage supply, DC power supply base and terminal power supply.
The power supply has good over current, over voltage, anti - reverse connection and other functions.

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1.3 Station system parameters
Parameter
type
Parameter
Name
The parameter value
Description
Characteristic
parameters
Support
Frequency
Quad-frequency: GSM850, EGSM900,
DCS1800, PCS1900
Module can automatically search frequency
Frequency selection can be set with the AT
command
Conform to GSM Phase 2/2+
-
GPRS
Connection
characteristics
GPRS multi-slot class 12 (default)
GPRS multi-slot class 1~12 (configurable)
GPRS mobile station class B
-
GPRS Data
features
GPRS data downlink transmission: up to
85.6 KBPS
GPRS uplink data transfer: up to 85.6 KBPS
Coding formats: cs-1, cs-2, cs-3 and cs-4
Supports the PAP (password verification
protocol) protocol commonly used for PPP
connections
Support for protocols commonly used for
CHAP (query handshake authentication
protocol)
The built-in protocols:
TCP/UDP/FTP/PPP/HTTP/NTP/MMS/SM
TP/PING, etc.
Support for unstructured supplementary data
services (USSD)
-
The antenna
interface
SMA interface, NET signal output, 50ohm
characteristic impedance
-
Transmission
Power
Class 4 (2W)：
GSM850 and EGSM900
Class 1 (1W)：DCS1800 and PCS1900
-
RF
Characteristic
parameters
The air rate
2.4kbps
8 adjustable level
（0.3、
1.2、 2.4、 4.8、 9.6、 19.2、
38.4、62.5kbps）
WOR role
receiver
Can be configured as a receiver/sender
WOR cycle
2000ms
500ms~4000ms
It can be configured as 500ms~4000ms
Transport mode
Transparent Transmission
Can be configured for transparent transmission
or fixed-point transmission
The module
address
0~65535
Default address 0
working
frequency
850.125MHz-930.125MHz
Default 868.125MHz, channel number 80,
channel interval 1MHz
Transmission
power
22dBm
level 4 adjustable (22, 17, 13, 10dBm)
Receiving
sensitivity
[email protected]
The receiver sensitivity is independent of the
baud rate and delay time
Baud rate
115200 bps
No modification supported
The antenna
interface
SMA Interface
RF signal output, 50 ohm characteristic
impedance
Station system
parameters
Flow loss value
(typical value)
66.5mA@12V
Idle state, no data transmission
Working
temperature
-30℃~+70℃
Extended to 40 ℃ ~ + 85 ℃ temperature
Working voltage
DC 8~28V
Recommend 12V/24V power supply
Size
108*75*37mm
Overall size (excluding antenna)

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1.4 Pin Description
3GPP
Frequency
1 Timeslot
2 Timeslot
4 Timeslot
CS-1
9.05kbps
18.1kbps
36.2kbps
CS-2
13.4kbps
26.8kbps
53.6kbps
CS-3
15.6kbps
31.2kbps
62.4kbps
CS-4
21.4kbps
42.8kbps
85.6kbps

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No.
Name.
Function
1
Grounding screw
Ground connection
2
DC_IN
Power adapter interface, power supply range 8~28V, recommended 12V/24V
3
DC_IN-
Power reference ground
4
DC_IN+
Power input, power supply range 8~28V, recommended 12V/24V
5
Reset
System reset button, long press time no requirement
6
USB
Micro USB：parameter configuration interface
7
Reload
Press 4~10s to restore the factory Settings
8
PWR
Red: power indicator
9
WORK
Yellow: data transmission indicator light; The light flashes when there is data
transmission
10
LINK
Yellow: network indication, always on after net
11
NET
4 G/GPRS antenna interface (SMA - K external thread hole, 50 Ω characteristic
impedance)
12
SIM
SIM card slot
13
RF
RF antenna interface (SMA - K external thread hole, 50 Ω characteristic impedance)
Note: it is recommended to connect the housing with the earth through grounding screws.

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1.5 Size

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2 Quick start
2.1 Hardware preparation and communication testing
Before the test, connect the power supply, USB cable, SIM card (insert the gap outwards), antenna and other
hardware according to the recommended circuit. If the power cable is successfully connected, the PWR indicator will
always be on.
E90-DTU (900SL22- GPRS) device and E22-900TXXS module
5V—20V Power adapter
USB switch to TTL module and USB wire
GPRS/LTE Sucker antenna
Computer browser visit Chengdu Ebyte official website: www.ebyte.com, download the latest E90-DTU
(900SL22-GPRS) series product configuration tools, E22 series product configuration software and serial
assistant (this article USES XCOM), install USB 232/485 driver, run the software!
1. After connecting the E22-900TXXS module with the USB-to TTL module, open the officially provided E22
configuration tool and select the corresponding COM number. If the COM number cannot be selected, check
whether the serial driver is installed correctly.

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2. Open the officially provided E90-DTU (900SL22-GPRS) configuration tool. If the USB is correctly connected, the
message box on the right side will prompt "device ready".
3. After entering the GPRS/2G network pass-through configuration mode, the parameters of GPRS/2G module can be
configured in the "setting relevant parameters" box. After the configuration is completed, click the "save NET
parameters" button, and the upper computer will prompt "save all parameters successfully". After completion, as
shown in the following figure:

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4. Switch from "GPRS/2G network transmission" to "RF", and the device model information will be displayed in the
message box on the right. The user configures the RF module in the "setting of relevant parameters". After the
configuration is completed, click the "save RF parameters" button. After completion, as shown in the following
figure:
5. After the configuration of module parameters, if the parameters in the mode of "GPRS/2G network transmission" are
modified, the "GPRS/2G network transmission" mode shall be modified again. Click the button of "module restart"
in the box of "public commands and prompts" to make the modified GPRS/2G parameters take effect and

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automatically enter the communication state; If the parameters in the mode of "GPRS/2G network transmission" are
not modified, there is no need to click the "module restart" button and directly click the "enter communication state"
button in the RF mode. After completion, as shown in the following figure:
6. Within 30 seconds after the communication state is entered, if the LINK indicator is always on, it indicates that the
server has been connected, then the network can be transparently transmitted.
7. Follow the WeChat official account of " 亿佰特物联网应用专家" on mobile phone, enter the page and click
successively: customer support -> device test. The screen shot of mobile phone is as follows:

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8. Use the serial port assistant to send data to E22-900TXXS module. If E90-DTU (900SL22-GPRS)
receives the data sent by E22-900TXXS, the WORK indicator light flashes.
( a ) E22-900TXXS sends data to E90-DTU (900SL22-GPRS)

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(b ) E90-DTU (900SL22-GPRS) sends data to E22-900TXXS

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2.2 Working mode and functions
1、Working modes are divided into communication mode and configuration mode, which are subdivided into GPRS/2G
network pass-through configuration mode and RF configuration mode.
( a ) Communication mode: the radio works in the communication mode by default after power on, and
automatically starts the network connection. When the connection is established with the server, any data received by
the radio will be transmitted to the server. At the same time, it can also receive data from the server. After receiving
the data from the server, the module will output directly through the rf module. This module supports a maximum
length of 512 bytes per packet.
( b ) GPRS/2G network pass-through configuration mode: in this mode, the user can configure radio GPRS/2G
network pass-through parameters.
( c ) RF configuration mode: this mode allows users to configure radio RF parameters.
( d ) Mode switch: use the official E90-DTU (230SL30-GPRS) to configure the upper computer for mode switch and
parameter configuration. Note that after using the upper computer to enter the configuration state, the system is in
the configuration mode. At this time, click the "module restart" button or "enter the communication button", and the
system will switch to the communication mode. After entering the configuration state, unplug the USB cable and the
system will automatically switch to the communication mode. At this time, if the parameters are not saved in
advance or the GPRS/2G network transmission parameters are modified but the "module restart" button is not
clicked, the modified parameters will not take effect.
2、Base station positioning function;
E90-DTU (900SL22-GPRS) supports the base station positioning function. Users can use the officially
provided E90-DTU (900SL22-GPRS) configuration software and click the "query LBS information" button in the
GPRS/2G network transmission configuration mode to read the LBS information of the device in the current period.

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3、Inquire the signal strength of the connection between the network module and the base station
Users can use the officially provided E90-DTU (900SL22-GPRS) configuration software. In the configuration mode
of GPRS/2G network transmission, click the "query signal strength" button to obtain the current signal strength
information.
4、Network function
Registration Package: registration packet off by default, the user can configure four registered package types,
optional respectively connected when sending a physical address, connection when sending a custom data,
additional physical address before every packet data, additional custom data before every packet data, custom
registration packet maximum length 40 bytes (when set to HEX format, the maximum length of 20 bytes).
a) In the idle state of network communication, heartbeat packet is used for network state maintenance. Its
heartbeat cycle can be set to 0~65535 seconds, and the maximum length of heartbeat packet is 40 bytes (when
set to HEX format, the maximum length is 20 bytes). Support two types of heartbeat: network heartbeat and
serial heartbeat. When network heartbeat is selected, it will start timing with communication idle and send
heartbeat packets to the server according to the configured heartbeat cycle. Select heartbeat as serial port, start
timing with communication idle, and send heartbeat packet to serial port according to configured heartbeat
cycle.
b) Clear the cache：before establishing a connection with the server, the data received by the serial port will be cached.
When establishing a connection with the server, you can choose whether to clear the cached data.
By default, clearing the cache will be closed. The maximum packet length from the local cache is
256 bytes.
7、The cloud transmission function of Ebyte IOT platform
Users can use the official E90 - DTU (900SL22 - GPRS) configuration software, GPRS / 2 G network
passthrough configuration mode, click on the "cloud passthrough" option, open module Ebyte cloud platform
passthrough function, after open, the user configuration information such as heartbeat, registration package will be
failure, users only need to a platform set up corresponding device passthrough forward relations between devices can
be realized data. For specific operation, please refer to the guide for transmission of Ebyte cloud platform.
8、Radio frequency function
( 1 )RF RSSI ：Signal strength indicating function. Internal radio frequency module supports data packet
signal strength output. Can be used to evaluate radio frequency signal quality, improve communication
network, ranging. Support environment noise signal strength output to network server. Can be used to
manually implement LBT functions.
( 2 ) Radio frequency has FEC forward error correction algorithm: its coding efficiency is high, error
correction ability is strong, in the case of sudden interference, can take the initiative to correct the packet
interference, greatly improve the reliability and transmission distance; In the absence of an FEC, such packets
can only be discarded.
（3）Networking function: this station can realize multi-level relay networking with E22 series modules or
E90-DTU (XXXSLXX) series stations. Multistage relay is suitable for ultra long distance communication.
Multiple networks are running in the same region at the same time, truly realizing the mutual forwarding of
multiple LANS to the Internet of things, and building the real Internet of things model. Please refer to the
chapter "application model" for details.

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（4）The radio frequency terminal has the function of Listen before talk (LBT), which enables the radio
station to actively Listen to the environmental noise of the channel after sending data to the server. If the noise
exceeds the threshold, the transmission will be delayed. This function can greatly improve the success rate of
radio communication with radio frequency in harsh environment. This function can be used for network
transmission and conflict prevention.
（5）Fixed point transmission: support address function, radio frequency terminal can transmit data to
other wireless devices at any address and any channel to achieve networking, relay and other applications: for
example, the radio needs to transmit data to E22 cofrequency series module B (address 0x00 01, channel 0x80),
and its communication format is: 0001 80 AA BB CC, where 0001 is the address of module B and 80 is the
channel of module B, then module B can receive AA BB CC, and other modules do not receive data (the same
is true for E90-DTU (xxx-SLXX) series stations).
（6）LoRa spread spectrum: LoRa direct sequence spread spectrum technology will bring more
communication distance; Low transmission power density, not easy to cause interference to other equipment;
9、Factory recovery
There are two ways to restore the factory：
Software restore factory: users can configure software through the E90-DTU (900SL22-GPRS) officially
provided. In the configuration mode of GPRS/2G network transmission and RF configuration mode, click
the "restore from factory" button to reset the GPRS/2G module and RF module. Note: if the "restore
factory" button is clicked in the configuration mode of GPRS/2G network pass-through, after all
parameter modification operations are completed, the "module restart" button should be clicked again to
enable the restored factory or configured GPRS/2G network pass-through parameters to take effect.
Hardware restore factory：The user can press the Reload button on the side of the radio station for 4~10S
and all parameters will be restored to the factory setting. At this time, the system will automatically
switch to the communication mode.

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3 Application model
（1）E22-900TXXS + E90-DTU(900SL22- GPRS) + Server A
（2）E90-DTU(900SLxx) + E90-DTU(900SL22- GPRS) + Server A
（3）Ebyte cloud transmission

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（4）Application in buildings

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4 Note
PC click "to enter configuration mode", the system in the configuration state, press the Reload button 4 ~
10 s, products will be back to factory Settings, and automatically switch to a communication status,
"choice mode", the switch at this time the upper machine message box will pop up "parameter error \ r \ n
try click enter configuration status button" message, at this time to enter the configuration state, the
"public order and prompt" click on the upper machine box "to enter configuration mode" button, if you
want to keep communication, do not click the "enter configuration mode" button.
If the upper computer prompts wrong parameters or the module fails to respond, please try to solve the
problem by pressing the Reset button, re-entering the configuration state, checking whether the USB
connection is correct, and checking whether the module is powered on normally.
Enter the configuration state, check whether the USB connection is correct, check whether the module is
powered on normally.
The status bar of the upper computer device shows "no valid device found". Check whether the USB
cable and power cord are connected correctly. If they are connected, try to press the Reset button, re-plug
the power cord or re-plug the USB.
Server A of this product is always open. After successful initialization, it will automatically establish
connection with the configured network server.
After the product is powered on, it has been unable to be successfully initialized, that is, the State
indicator light of more than 30 seconds has no indication. At this time, it should check whether the
module installation is normal, whether the SIM card is inserted normally and whether the SIM card has
been invalid.
Heartbeat function is used to maintain the connection after the successful establishment of connection
between the product and the server. In the network, if the client and the network server successfully
establish a connection and there is no data transmission for a long time, the Socket link may appear
"dead", that is, the link exists, but the data cannot be sent or received. Therefore, in practical use, it is
recommended to enable heartbeat packet function to ensure the reliability of network links.
In practice, it is normal that there are differences in data delay between two communications.
Version
Date
Revision note
By.
1.00
2019/04/25
Original version
Lizhibing
5 About Us
Website: www.ebyte.com Sales: [e-mail] Support: suppo[email protected]
Tel: [phone] Ext. 812 Fax: [phone]
Address: Innovation Center B333~D347, 4# XI-XIN road, High-tech district (west), Chengdu, Sichuan, China.