USR IOT USR-G771-E User manual

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USR-G771-E User Manual
Document version: V1.0.5

USR-G771-E User Manual Technical Support: h.usriot.com
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1. Introduction ............................................................................................................................................................. 3
1.1. Overview ...................................................................................................................................................... 3
1.2. Features ....................................................................................................................................................... 3
2. Get Started ..............................................................................................................................................................4
2.1. Specification ................................................................................................................................................. 4
2.2. Hardware ......................................................................................................................................................5
2.2.1. Dimensions ........................................................................................................................................5
2.2.2. Indicators ........................................................................................................................................... 6
2.2.3. Connecting Hardware ........................................................................................................................6
3. Utility Configuration .................................................................................................................................................7
3.1. Download the Utility ..................................................................................................................................... 7
3.2. Starting the Configuration Utility .................................................................................................................. 7
4. Serial Port ............................................................................................................................................................... 9
4.1. Basic Parameters .........................................................................................................................................9
4.2. Frame forming mechanism ........................................................................................................................ 10
4.2.1. Time Trigger .................................................................................................................................... 10
4.2.2. Length trigger .................................................................................................................................. 10
5. Selecting an Operating Mode ............................................................................................................................... 11
5.1. Transparent Mode ......................................................................................................................................11
5.2. HTTPD Client Mode ................................................................................................................................... 14
5.3. SMS Mode ..................................................................................................................................................16
5.4. MQTT Mode ............................................................................................................................................... 18
5.4.1. Generic MQTT .................................................................................................................................19
5.4.2. Subscribe/Public Topics .................................................................................................................. 21
5.4.3. AWS IoT Service ............................................................................................................................. 22
6. General Function .................................................................................................................................................. 31
6.1. Identity Package .........................................................................................................................................31
6.2. Heartbeat Package .................................................................................................................................... 33
6.3. Socket Distribution Protocol .......................................................................................................................34
6.4. Backup Socket ........................................................................................................................................... 35
6.5. SSL/TLS Encryption ...................................................................................................................................36
6.6. Security ...................................................................................................................................................... 37
6.7. NTP ............................................................................................................................................................ 39
6.8. FTP Upgrade ..............................................................................................................................................40
6.9. Base Station Geolocation ...........................................................................................................................40
6.10. Firmware Upgrade ................................................................................................................................... 40
6.11. Restore to Factory Default Settings .........................................................................................................41
6.12. Timeout Restart ........................................................................................................................................42
7. AT Commands ......................................................................................................................................................42
7.1. AT Command Settings ...............................................................................................................................42
7.2. Serial AT Commands ................................................................................................................................. 43
7.3. Network AT Commands ............................................................................................................................. 43
7.4. SMS AT Commands .................................................................................................................................. 44

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1. Introduction
1.1. Overview
USR-G771-E is a LTE CAT 1 communication modem, which supports LTE and GSM, covers the mainstream
frequency bands of European operators. It has perfect software function, supports TCP/UDP transparent
transmission, SMS transmission, HTTPD Client mode and AT command configuration. In addition, it is simple
to configure, has high reliability and built-in hardware watchdog, supports FOTA upgrading.
USR-G771-E supplies a wide voltage range power through terminal and DC interface, RS232 and RS485
standard interfaces, meets the needs of different application scenarios.
1.2. Features
Equipped with CAT-1 network, 10Mbps download rate, 5Mbps upload rate, meeting 80% of the data
transmission application scenarios
Low latency in milliseconds
Multiple modes, supports LTE CAT 1 and GPRS
Wide coverage, high stability based on existing 4G network
Supports TCP/UDP, HTTPD and SMS transparent transmission
Each socket supports buffering 20 packets of serial port data, each packet is up to 4K
Supports parameter configuration via network, serial and SMS AT command
Supports base station geolocation and NTP function
Support 9~36V wide voltage supply

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Multiple indicator lights, convenient and accurate to check the device status
Industrial grade, hardware watchdog, high reliability
2. Get Started
2.1. Specification
Parameters
Description
Basic Parameters
USR-G771-E
Supports B1/B3/B7/B8/B20
Power
DC 9V~36V
Operating current
Average: 21mA-50mA, maximum: 54mA (12V)
Indicators
POWER: Power indicator, always on after normal power supply.
WORK: Working status indicator, flashes every second.
NET: Network status indicator, green means 4G, red means 2G.
LINK: Socket A connection status indicator, always on after connecting.
DATA: Data transmission indicator, on when there is data transmission.
SIM/USIM
3V/1.8V SIM slot, 2FF
USB interface
Slave, MicroUSB, USB 2.0 High speed
UART interface
RS232 and RS485, baud rate 1200~230400 bps.
Antenna interface
SMA female cellular antenna connector
Environmental
Dimensions(mm)
82.6 × 86 × 25
Weight(g)
<110g
Temperature
Operating temperature
-30℃~ +75℃
Storage temperature
-40℃~ +90℃
Humidity
Operating humidity
5%~95% (non-condensing)
Transmission
speed
LTE FDD Rel.13
10MbpsDL/5Mbps UL
GPRS
85.6KbpsDL/85.6Kbps UL(multi-slot class 12)
Bands
LTE FDD
B1/B3/B7/B8/B20
GSM
900/1800MHz
TX Power
FDD:B1/3/7/8/20/28
23dBm±2dB
GSM:900MHz
33dBm±2dB
GSM:1800MHz
30dBm±2dB
Rx Sensitivity
GSM:900MHz
-109.5dBm
GSM:1800MHz
-108dBm
FDD:B1/3/20
-98dBm
FDD:B7
-97.5dBm
FDD:B8/B28
-98.5dBm

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Software
Operating mode
TCP/UDP/HTTPD/SMS transparent transmission, CMD mode
Configuration command
AT+command
Network protocol
TCP/UDP/DNS/FTP/HTTP/IPV4/IPV6
Socket number
4
User configuration
Serial/Network/SMS AT command
Features
Socket distribution protocol
Support
Heartbeat package
Support ICCID/IMEI/SN/User-defined/LBS
Identity package
Support ICCID/IMEI/SN/User-defined/CLOUD
FOTA self upgrade
Support
Backup socket
Support
Base station geolocation
Support
FTP upgrade
Support
NTP
Support
2.2. Hardware
2.2.1.Dimensions

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2.2.2.Indicators
There are five indicators on USR-G771-E, PWR, WORK, NET, LINKA, DATA.
Indicator
Function
Status
POWER
Power indicator
Always on after normal power
supply.
WORK
Working status indicator.
Flashes every second.
NET
Network status indicator
Green means 4G network, red
means 2G network.
LINKA
Socket A connection status indicator
Always on after socket A is
connected
DATA
Data transmission indicator
On when there is data
transmission
2.2.3.Connecting Hardware
If you have purchased, there will be the following accessories:
USR-G771-E
Antenna
Power adapter
Female to female
adaptor
Required additional equipment:
RS232 serial to USB cable

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PC
1. Installing SIM card and antenna：
Press the yellow button and the SIM card slot will pop up. Then Install the antenna.
2. Serial Connecting:
RS232: Using the standard RS232 to USB cable, connect the RS232 male connector into the RS232 port
on the G771-E. Connect the USB connector (other end of the cable) into the PC.
RS485: Connect pin A of the RS485 interface of the G771-E to pin A of the RS485 to USB adaptor, pin B of
G771-E to pin B of the adaptor.
3. Power Supply:
Connect 9-36V DC power adapter to power G771-E. Then “POWER” indicator will always on and the
“WORK” indicator will flash.
3. Utility Configuration
3.1. Download the Utility
Please download the utility in this link:
https://www.pusr.com/products/RS232/RS485-serial-to-Cat-1-771.html
3.2. Starting the Configuration Utility
USR-G771-E utility is shown as following:

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Description:
1. In PC serial parameter setting area, it is necessary to set the serial parameters consistent with the serial
device, otherwise they cannot communicate with each other.
2. Working mode selection area, select the work mode of the modem.
3. In the parameter setting area of characteristic functions, set parameters related to modem's featured
functions.
4. Modem parameter area, setup some basic global parameters.
5. Common command button, click to send the self-input command.
6. Data receiving and display area, displaying the data sent and received.
7. Data sending area, input the data and click Send.

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4. Serial Port
4.1. Basic Parameters
Serial parameters of USR-G771-E must be consistent with the parameters of the serial device. Serial port
parameters include basic parameters and framing parameters.
Item
Parameter
Baud rate
1200~230400bps
Data bit
8
Stop bit
1,2
Check bit
NONE
EVEN
ODD

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4.2. Frame forming mechanism
4.2.1.Time Trigger
When G771-E receives data from the UART, it continuously checks the interval of two adjacent bytes. If the
interval time is greater or equal to a certain "time threshold", then a frame is considered finished, otherwise
the data is received until greater or equal to the packet length byte set. This frame is sent to the network as a
TCP or UDP packet. The "time threshold" here is the time between packages. The range of settable is
10ms~500ms. Factory default: 50ms.
This parameter can be set by AT command, AT+UARTFT=<time>.
Note: T is the packing interval time.
4.2.2.Length trigger
When G771-E receives data from the UART, it constantly checks the number of bytes received. If the number
of bytes received is equal to a certain "length threshold", a frame is considered to have ended, otherwise the
packaging time is waiting for the end. This frame is sent to the network as a TCP or UDP packet. The "length
threshold" here is the package length. The settable range is 5~4096. Factory defaults to 1024.
This parameter can be set by AT command, AT+UARTFL=<length>.
Note: L is the packaging length.