Ebyte E840-TTL-4G02E User manual

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E840-TTL-4G02E

Chengdu Ebyte Electronic Technology Co.,Ltd. E840-TTL-4G02E User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd. I
Contents
Disclaimer...............................................................................................................................................................................1
1 Introduction......................................................................................................................................................................... 2
1.1 Brief Introduction............................................................................................................................................. 2
1.2 Features.............................................................................................................................................................2
2 Specification and parameter................................................................................................................................................ 3
2.1 Module parameter.............................................................................................................................................3
2.2 Size and pin definition......................................................................................................................................4
3 Quick start............................................................................................................................................................................6
3.1 Hardware.......................................................................................................................................................... 6
3.2 Software and configuration.............................................................................................................................. 7
3.3 Data transfer test...............................................................................................................................................8
4 Module function.................................................................................................................................................................. 9
4.1 Operating mode................................................................................................................................................ 9
4.1.1 Transparent transmission mode............................................................................................................. 9
4.1.2 4-channel Socket connections............................................................................................................... 9
4.1.3 AT Configuration Mode.......................................................................................................................10
4.2 Network function............................................................................................................................................10
4.2.1 Short connection.................................................................................................................................. 10
4.2.2 Registration package............................................................................................................................10
4.2.3 Heartbeat packet.................................................................................................................................. 11
4.2.4 Clear cache...........................................................................................................................................11
4.3 High speed mode............................................................................................................................................ 11
4.4 SMS function..................................................................................................................................................14
4.4.1 SMS sending........................................................................................................................................14
4.4.2 SMS receiving..................................................................................................................................... 15
4.4.3 SMS configuration/query.................................................................................................................... 15
4.5 Interconversion between Modbus RTU and Modbus TCP............................................................................. 15
4.6 Base station positioning function....................................................................................................................16
4.7 Serial port packaging function........................................................................................................................16
4.8 Network AT commands function.....................................................................................................................16
5 Notes..................................................................................................................................................................................17
6 Important Statement.......................................................................................................................................................... 19
7 Reversion History.............................................................................................................................................................. 19
About Us...............................................................................................................................................................................19

Chengdu Ebyte Electronic Technology Co.,Ltd. E840-TTL-4G02E User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
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.

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1 Introduction
1.1 Brief Introduction
E840-TTL-4G02E is an LTE transmission module launched by Ebyte. This
product has complete software functions and covers most common application
scenarios. You can easily use this product to achieve two-way data transparent
transmission from serial to network.
The module with 2.0 mm pin header is good for embedded development by
a wide voltage of 5.0V to 20.0V. It supports 4G cards of CMCC, CUCC and
CTCC. Compatible levels for communication and LED indication, the default
3.3V can be applied to 5V level, with anti-interference ability, can adapt to use in some environments with strong
electromagnetic interference, like in some power industries.
1.2 Features
Almost meet all M2M application demands;
Support data transparent transmission, support TCP, UDP network protocol, support heartbeat package, registration
package function;
Support two-way serial transmission from device to network server for 460800 serial port baud rate and below;
Support serial port large cache function, the serial port data can be cached locally before the server is established;
Support SMS sending and receiving, SMS remote query / configuration device parameters;
Support multiple Socket links to send and receive at the same time;
Support Modbus RTU and Modbus TCP to automatically convert each other;
LTE-FDD: Max downstream rate of 150Mbps, Max upstream rate of 50Mbps;
With software/hardware double watchdog design, the system is stable, will never crash.

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2 Specification and parameter
2.1 Module parameter
Parameter
Value
Description
Characteristic
Frequency
LTE-FDD: B1/B3/B7/B8/B20/B28A;
WCMD: B1/B8;
GSM:900M/1800MHz;
Network Protocol Features
Support TCP/UDP protocol
Hardware
Power supply(V)
DC 5V～18V
Antenna
IPEX
Interface
TTL
Baud rate
Support Max.921600bps, default 115200bps
Consumption
(Typical)
Standby:104mA @ 5V
Network:191mA @ 5V
Transfer:212mA @ 5V
Weight
11.9±0.1g
Size
42 * 40 * 9.7mm
Operating
Temperature(℃)
-40～85 (INDUSTRIAL GRADE)

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2.2 Size and pin definition
Pin No.
Name
Description
1
RST
Reset pin
2
IO_RT
The low level lasts for 3~10S, the module parameters will be restored to the
factory settings, and will be restarted immediately.
3
LIKA
SocketA link connection status indicator pin, corresponding to the onboard
left 1 LED.
High: SocketA is successfully connected to the web server;
Low: SocketA did not successfully connect to the network server;

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4
LIKB
The SocketB link connection status indicator pin corresponds to the onboard
left 2 LED.
High: SocketB is successfully connected to the web server;
Low: SocketB did not successfully connect to the network server;
5
DATA
The data TX and RX indication pin, when the network receives the data or
the serial port receives the data (50ms high/10ms low), corresponding to the
onboard left 3LED light.
6
STAT
The device status indication pin corresponds to the onboard left 4 LED.
Low: The device is powered on to search for SIM card
1800ms low, 200ms high: the device checks the correct SIM card and is
attaching to the network;
High: The device is attached to the network successfully.
7
RXD
Data receiving pin, default 3.3V, compatible with 5V communication level.
8
TXD
Data transmitting pin, default 3.3V, compatible with 5V communication
level.
9
VEF
Drive level power supply pin, if you need to achieve serial communication
and LED indication is 5V drive level, you need to input 5V level on this pin.
10、11、
14、15、23
MOD、SLE、
PA11、PA10、
EN
NC
12
4V2
Lithium battery power supply pin, power supply range: 3.8V~4.3V. This pin
is prohibited from being reversed and is not allowed to be supplied with
VCC.
16
VCC
DC power supply pin, power supply range: 5V~18V. This pin is prohibited
from being reversed and is not allowed to be supplied with VCC.
19
VD
External SIM card power supply pin, if the onboard SIM card holder is used,
the pin remains NC
20
RS
External SIM card reset pin, if the onboard SIM card holder is used, the pin
remains NC
21
DA
External SIM card data pin, if the onboard SIM card holder is used, the pin
remains NC
22
CL
External SIM card clock pin, if the onboard SIM card holder is used, the pin
remains NC
24
LIKD
SocketD link connection status indicator pin, corresponding to the onboard
right 3 LED.
High: SocketD is successfully connected to the web server;
Low: SocketD did not successfully connect to the network server;
25
LIKC
SocketC link connection status indicator pin, corresponding to the onboard
right 2 LED.
High: SocketC is successfully connected to the web server;
Low: SocketC did not successfully connect to the network server;
13、17、18
GND
Ground

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3 Quick start
This chapter is a quick start introduction for E840-TTL-4G02E, build the easiest hardware environment to test the
network transmission function of E840-TTL-4G02E, to achieve bidirectional transparent transmission of data from serial
device (here refers to the computer) to the network server.
3.1 Hardware
Hardware for test are as follows：
Before test，connect the serial cable according to the recommended circuit, insert SIM card (the notch is facing
outwards), prepare antennas and other hardware.
E840-TTL-4G02E
5V—20V power adapter or 4.2V lithium battery
USB to TTL convertor
4G/LTE sucker antenna, GPS antenna and two
IPEX to SMA adapter cables

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Serial cable connected according to recommended circuit diagram, SIM card and antenna.
Connect the power supply, antenna, SIM card, serial cable and other hardware before testing.
3.2 Software and configuration
Step 1. Access the official website of EBYTE: www.ebyte.com, to download the latest GPRS/E840-TTL-4G02E
series product configuration tool, install USB to 232/485 driver, run the software.
Step 2. Select the corresponding COM port number. The factory default serial port baud rate is 115200, 8N1, as
shown below:
Step 3. Click the tool "Enter Configuration Status" button and wait for the device parameters to be automatically
obtained. After completion, the following figure is displayed:

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Step 4. Set the device connection server IP and port number to: 112.54.89.224:4000 (non-LAN IP address, public
network address is required, the IP address here is only for demonstration), and finally click "Save all parameters", the
final picture is as follows:
Step 5. Click the tool "Module Restart" button and wait for the device LINK light to be on.
3.3 Data transfer test
Step 6. Use the PC to open "NetAssist.exe" and start the public network server, as shown in the following figure:
Step 7. Use the PC-side tool to send data to, and use the mobile phone to send data to the device. The

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communication test result is as shown below:
4 Module function
4.1 Operating mode
4.1.1 Transparent transmission mode
After power-on, the radio works in the transparent transmission mode by default, and automatically starts the
network connection. When the connection is established with the server, any data received by the serial port will be
transparently transmitted to the server. At the same time, it can also receive data from the server. After receiving the
server data, the module will output directly through the serial port. The maximum length of data supported by this
module is 10 bytes. When multiple links are connected to the server at the same time, the data packet will be sent to the
four links at the same time. When there are data to be sent from any network link, the radio will transparently output the
data.
4.1.2 4-channel Socket connections
This module supports 4-channel Socket connections. For each socket users can configured it as TCP Client or UDP
Client. When sending data, users can use protocol transmission or transparent transmission.The maximum length of
data supported by this module is 1024 bytes.
Protocol transmission format (please open the protocol transmission mode, refer to "E840-TTL-4G02E-AT
instruction set" for details)
Send：0x55 0xFE 0xAA ID data
For example：55 FE AA 00 AA BB CC //00：SOCK0 link，AA BB CC：the data that the user actually needs
to transmit
Receive：0xAA 0XFE 0x55 ID data length Data
For example：AA FE 55 00 00 03 11 22 33 //00: SOCK0 link，00 03：the valid data length received this time

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11 22 33：real data
Demonstration：
Take SOCK0 as an example：
Send：+++(do not add new line for transmitting ) //enter AT command
Send：AT+VER(add new line for transmitting ) //read version info. And enter AT command setting at the same
time
Back：+OK=E840-DTU(4G-02E)_V1.0
Send：AT+SOCK=TCPC,116.62.42.192,31687 //Open SOCK0, and set the network server parameters that
SOCK0 will connect to (the parameter used here is Ebyte test server, not recommended for users)
Back：+OK
Send：AT+LINKSTA //check if SOCK2 has started connection with server
Back：+OK=Connect
Send：AT+POTOCOL=ON //open protocol transmission mode
Back：+OK
Send：AT+POTOCOL //inquire if protocol transmission is on
Back：+OK=ON
AT+REBT //restart
Back：+OK
Waiting for the radio to restart, SOCK will automatically establish a connection with the server. After the connection
is started, data can be transmitted to each other via protocol.
4.1.3 AT Configuration Mode
Under this mode, all UART data is considered as AT command. In the transparent transmission mode, after the serial
port receives the "+++" frame data, the RX pin receives any AT command within 3 seconds, and the mode switches to the
AT mode. In AT mode, send AT+EXAT<CR><LF> to switch to transparent transmission mode.
Please read "E840-TTL-4G02E-AT Command Set" carefully when using AT command configuration mode.
4.2 Network function
4.2.1 Short connection
In TCP Client mode, open the short connection, if no data is received through the serial port or network port within
the set time, the network connection will be automatically disconnected. The short connection function is not enabled by
default. When enabled, the connection time can be set from 2 to 255 seconds. When the connection time is set to 0, the
function is turned off.
4.2.2 Registration package
The registration package function is not enabled by default. There are a total 4 types of registration package can be

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configured. ①Send physical address (IMEI code) when connecting. ②Send custom data when connecting. ③Add the
physical address before each packet when connecting. ④Add custom data before each packet when connecting. The
maximum length of the custom registration data packet is 40 bytes (with HEX format, the maximum length is 20 bytes).
4.2.3 Heartbeat packet
In idle state of network communication, heartbeat packets are used for network status maintenance. The heartbeat
cycle can be set from 0 to 65535 seconds, and the maximum length of the heartbeat packet is 40 bytes (when set to HEX
format, the maximum length is 20 bytes). Supports two heartbeat types: network heartbeat and serial heartbeat.
Network heartbeat: from the communication idle time, send heartbeat packets to the server according to the
configured heartbeat period.
Serial port heartbeat: from the communication idle, send heartbeat packets to the serial port according to the
configured heartbeat period.
4.2.4 Clear cache
Before connecting to the server, the data received by the serial port will be cashed. After connection, you can choose
to clear the cached data or not. By default, the cache will be cleared. The maximum size of each Socket in the local cache
is 10 bytes, and each Socket buffer is independent of each other.
4.3 High speed mode
The E840-TTL-4G02E is designed with a separate high-speed mode. In this mode, both the network and the device
can transmit any packet length data, such as file, picture, and video.
Configure/query the high-speed mode state through the AT+HSPEED command. After the high-speed mode is
enabled, the device can transmit any packet length data at 460800 serial port baud rate.
The E840-TTL-4G02E file transfer process will be demonstrated below:
Step 1. Turn on the high-speed mode: After the device enters the AT mode, send AT+HSPEED=ON to enable the
high-speed mode, configure the connected server address, and restart the device.
Step 2. Prepare files for transfer, RF_Setting_E90.exe. The file is an executable file. After startup, the following
interface is displayed:

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Step 3. Open the serial port tool and use the file sending method to open RF_Setting3.49.exe. After the device is
connected to the network server normally, click “send file”and the sending is completed as shown below.：
Step 4. The server (the external network mapping used for this demo, the server is the TCP debugging tool), after
receiving the data, as below：

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Step 5. Save the data as an .exe trial file type. This time it is named RF.exe, as below:
Step 6. Click on the server to run RF_Setting.exe to test the file, as below:

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In summary, the E840-TTL-4G02E completes the remote transfer of files from the serial port to the network server.
4.4 SMS function
E840-TTL-4G02E supports SMS sending and receiving, SMS remote configuration function (inserted SIM card
needs to support SMS service).
4.4.1 SMS sending
Under AT mode, send AT+SMSSEND=number,data to complete the SMS sending. The number refers to the
receiving number, and data refers to the data to be sent.
Like below:

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4.4.2 SMS receiving
The device can receive remote SMS content in transparent transmission mode. The format is as follows:
+SMS REC：number
data, the number is the sender's mobile phone number and data is the received short message content.
4.4.3 SMS configuration/query
The device supports SMS remote configuration/inquiry parameters in transparent transmission mode. The format of
the command is:
<Head>AT+CMD，<Head>is the device SMS identifier，The factory default is “EbyteSMS” , CMD is the
corresponding command. For more informations, please check”E840-TTL-4G02E AT commands”.
In this demo, use the mobile phone to query the SOCK1 link information of the device remotely.
4.5 Interconversion between Modbus RTU and Modbus TCP
E840-TTL-4G02E supports the interconversion between Modbus RTU and Modbus TCP. Enable this function, after
receiving data, the device will detect whether them are the Modbus RTU or Modbus TCP protocol. If data belong to one
of the two protocol, them will be converted. If not, only supports output/send raw data.
For example, the serial port receives the ModbusT RTU write-out command in the following format (hexadecimal):
01 06 00 01 00 01 19 CA（Modbus RTU）
When the interconversion function enable. Data received by the network is:
00 01 00 00 00 06 01 06 00 01 00 01（Modbus TCP）
Data sent by the network is:
00 01 00 00 00 06 01 06 00 01 00 01（Modbus TCP）
The serial port will output data as:
01 06 00 01 00 01 19 CA（Modbus RTU）
Note: In the Modbus TCP standard protocol, the transaction element identifier needs to be specified. In
E840-TTL-4G02E, the user can configure the value through AT+MTCPID, and when the value is configured to 0, the
receiving end All data conforming to the Modbus TCP protocol will be parsed, otherwise only packets with the same
application packet identifier and device configuration identifier will be converted.

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4.6 Base station positioning function
The E840-TTL-4G02E supports the base station positioning function. The user can send the AT+LBS command in
the AT mode to read the current LBS information of the device. The device returns the data format as follows:
+OK=LAC,xxxx;CID,xxxx
The “LAC” is the unique identification number of the global cell, “CID” is the base station number, (xxxx is the
hexadecimal value);
The LAC and CID number can be used to query the current location information of the device. For the query
method, refer to the link: http://www.gpsspg.com/bs.htm
Note: This website may not be available, it is not maintained by Ebyte. You can search for available websites
through keyword "base station location".
4.7 Serial port packaging function
E840-TTL-4G02E serial port break time and packing length can be configured. The user can configure the frame
break time and the package length through the AT+UARTTS command. Please refers to the AT command for the specific
configuration .
a) Frame break time: When the serial port receives data, it will continuously detect the interval between two bytes. If
it is greater than the configuration time (50-2000ms), the device will automatically send the previously received data as a
data packet to Network side;
b) Packing length: When the serial port receives data, it will continuously check the length of the currently received
data. If the length of the configuration is exceeded (20~1024 bytes), the device will automatically send the previously
received data as a data packet to Network side.
4.8 Network AT commands function
E840-TTL-4G02E supports connection on web pages, and when the module works in transparent transmission mode.
Through the connected web pages, it can inquiry or configure parameters remotely. The command format is:
<Head>AT+CMD, The <Head> is the device network AT identifier, the default value is: EbyteNET, CMD is the
corresponding command, you can view the AT command for details;
(*Note: For the incorrect network AT command, it will return + ERRER)
Here is an example of query baud rate:

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5 Notes
The first Socket of this module will always be opened. After the initialization is successful, it will
automatically establish a connection with the configured network server.
After the module is powered on, it cannot be initialized successfully. That is, the State indicator has no
indication for more than 30 seconds. In this case, check whether the module is installed properly, whether the
SIM card is properly inserted, and whether the SIM has failed.
Short connection function can be used to reduce the connection pressure of multiple devices to the server.
When the short connection function is enabled (AT+SHORTM>2), the module will actively disconnect the
connection when the network or serial port has no data for more than the short connection setting period.
After the disconnection, the network cannot send data and the local serial port sends. For valid data, the
module will immediately establish a connection with the server. If the local clear cache function is turned off,
the packet will be cached (maximum 10K bytes). After the connection is successful, the data will be sent to the
server. The local cache function is cleared and the packet will be discarded.
The heartbeat function is used to maintain the connection after the module and the server are successfully
connected. 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 chain. The road exists but
cannot send and receive data. Therefore, in actual use, it is recommended to enable the heartbeat packet
function to ensure the reliability of the network link.
In actual use, it is normal for the data delay of the two communications to be different.
After the protocol is closed, the maximum single packet length supported by a single link is 10K bytes. A local
serial port or a network sending a packet exceeding this length may cause packet abnormality. The distribution
protocol is enabled. Each Socket is enabled. The link single packet can support up to 1024 bytes
(user-configured serial port packing length).
In the high-speed serial transmission mode, the EMBMAC and EMBCSTM registration package functions

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cannot be enabled, and in the high-speed mode, the short message transmission and reception function is not
supported. Only the first Socket effective link is valid, and the protocol distribution data is not supported.
After the EBYTE cloud transparent transmission function is enabled, the high-speed mode is invalid.
When the device serial port outputs the words “pdp error, device will be reset!”, it indicates that the PDP
context is disabled by the network. The SIM card may be loose or the current network channel is occupied
abnormally.
The SMS function needs to insert the SIM card to support the SMS service. The IoT card cannot send and
receive SMS messages. When the device sends a text message, the device responds with OK only to indicate
that the module has sent the SMS, which does not mean that the device has received the SMS.
After modifying the serial port break time, the AT command must be configured according to the frame break
time. For example, after setting the parameter to 2000ms, you need to configure the device parameters after
power-on. You need to send '+++'. , Send a valid AT command within the period of more than 2000ms and
less than 3000ms to enter the AT mode normally.
The network AT command will fail in high speed mode.