Usr USR-G760c User manual

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USR-G760c User Manual
File Version: V1.1

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Contents
1. Quick Start......................................................................................................................................................................... 5
1.1. Hardware Testing Environment.......................................................................................................................... 5
1.2. Data Transmission Testing.................................................................................................................................. 5
2. Product Overview............................................................................................................................................................. 6
2.1. Brief Introduction................................................................................................................................................... 6
2.2. Features..................................................................................................................................................................6
2.3. Parameters.............................................................................................................................................................7
2.4. Hardware Introduction..........................................................................................................................................7
2.5. Dimensions.............................................................................................................................................................8
3. Functions............................................................................................................................................................................8
3.1. Parameters Setting............................................................................................................................................... 9
3.2. Work Mode............................................................................................................................................................. 9
3.2.1. SMS Transparent Transmission Mode...................................................................................................9
3.2.2. Network Transparent Transmission Mode.......................................................................................... 10
3.2.3. Httpd Client Mode....................................................................................................................................11
3.3. UART Frame Mechanism.................................................................................................................................. 12
3.3.1. Time Frame.............................................................................................................................................. 12
3.3.2. Length Frame...........................................................................................................................................13
3.4. Features............................................................................................................................................................... 13
3.4.1. Registration Packet Function................................................................................................................ 13
3.4.2. Synchronize Baud Rate......................................................................................................................... 13
3.4.3. Heartbeat Packet.....................................................................................................................................14
3.4.4. Indicator Light...........................................................................................................................................14
3.4.5. Reload by Hardware............................................................................................................................... 15
3.4.6. Firmware Upgrade.................................................................................................................................. 15
4. AT Command.................................................................................................................................................................. 16
4.1. Switch Command Mode.................................................................................................................................... 16
4.2. Command Format...............................................................................................................................................17
4.2.1. Symbol Description:................................................................................................................................ 17
4.2.2. The Format of “Query” in Commands..................................................................................................17
4.2.3. The Format of “Response” in Commands...........................................................................................18
4.2.4. Specific Symbol Instructions................................................................................................................. 18
4.3. AT Instruction Set................................................................................................................................................19
4.4. AT Instructions..................................................................................................................................................... 20
4.4.1. AT............................................................................................................................................................... 20
4.4.2. AT+H.......................................................................................................................................................... 20
4.4.3. AT+Z.......................................................................................................................................................... 21
4.4.4. AT+E.......................................................................................................................................................... 21
4.4.5. AT+ENTM................................................................................................................................................. 21
4.4.6. AT+WKMOD............................................................................................................................................. 21
4.4.7. AT+CMDPW............................................................................................................................................. 22

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4.4.8. AT+STMSG...............................................................................................................................................22
4.4.9. AT+CSQ.................................................................................................................................................... 22
4.4.10. AT+RELD................................................................................................................................................23
4.4.11. AT+CLEAR..............................................................................................................................................23
4.4.12. AT+CFGTF............................................................................................................................................. 23
4.4.13. AT+VER.................................................................................................................................................. 23
4.4.14. AT+SN..................................................................................................................................................... 23
4.4.15. AT+ICCID................................................................................................................................................24
4.4.16. AT+MEID.................................................................................................................................................24
4.4.17. AT+UART................................................................................................................................................24
4.4.18. AT+UARTFT...........................................................................................................................................25
4.4.19. AT+UARTFL........................................................................................................................................... 25
4.4.20. AT+RFCEN.............................................................................................................................................25
4.4.21. AT+APN.................................................................................................................................................. 26
4.4.22. AT+SOCKA.............................................................................................................................................26
4.4.23. AT+SOCKB.............................................................................................................................................26
4.4.24. AT+SOCKAEN.......................................................................................................................................27
4.4.25. AT+SOCKBEN.......................................................................................................................................27
4.4.26. AT+SOCKASL........................................................................................................................................27
4.4.27. AT+SOCKBSL........................................................................................................................................28
4.4.28. AT+SOCKALK........................................................................................................................................28
4.4.29. AT+SOCKBLK........................................................................................................................................28
4.4.30. AT+SOCKATO....................................................................................................................................... 29
4.4.31. AT+SOCKBTO....................................................................................................................................... 29
4.4.32. AT+SOCKIND........................................................................................................................................ 29
4.4.33. AT+REGEN............................................................................................................................................ 30
4.4.34. AT+REGTP.............................................................................................................................................30
4.4.35. AT+REGID..............................................................................................................................................30
4.4.36. AT+REGDT.............................................................................................................................................31
4.4.37. AT+REGSND......................................................................................................................................... 31
4.4.38. AT+CLOUD.............................................................................................................................................31
4.4.39. AT+HEARTEN....................................................................................................................................... 32
4.4.40. AT+HEARTDT........................................................................................................................................32
4.4.41. AT+HEARTTP........................................................................................................................................32
4.4.42. AT+HEARTTM....................................................................................................................................... 33
4.4.43. AT+HTPTP............................................................................................................................................. 33
4.4.44. AT+HTPURL...........................................................................................................................................33
4.4.45. AT+HTPSV............................................................................................................................................. 34
4.4.46. AT+HTPHD.............................................................................................................................................34
4.4.47. AT+HTPTO............................................................................................................................................. 34
4.4.48. AT+HTPFLT............................................................................................................................................35
4.4.49. AT+DSTNUM......................................................................................................................................... 35
4.4.50. AT+SMSEND......................................................................................................................................... 35
4.4.51. AT+CISMSSEND...................................................................................................................................36

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4.4.52. AT+SMSFLT........................................................................................................................................... 36
4.4.53. AT+SMSPH............................................................................................................................................ 36
5. Contact Us.......................................................................................................................................................................37
6. Disclaimer........................................................................................................................................................................37
7. Update History................................................................................................................................................................ 37

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1. Quick Start
This chapter aims at getting start USR-G760c quickly. It’s recommended that user read this chapter
systemically and operate it according to instruction to make a scientific knowledge. Following chapter will
introduce specific details and instruction, user can read interested chapter according to need.
If you have any question, feed it back to customer center please:
http://h.usriot.com
1.1. Hardware Testing Environment
1.2. Data Transmission Testing
1. Power on the DTU, reload to factory defaults. Reload method please refer to Chapter 3.4.5
2. Open the USR Setup software for USR-G760, set correct serial parameters and open the serial port.
3. Input www.usriot.com in the left side of the software and click “send”
<Note>
Defaults: socket A is set to be TCP Client, destination IP is set to be test.usr.cn, destination port is set to
be 2317
test.usr.cn:2317 is our USR testing server, it will return the data that received.

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Figure 1 Transparent transmission diagram
2. Product Overview
2.1. Brief Introduction
USR-G760c is a 3G DTU which is apply to CDMA2000 network type, and supports CDMA2000 1xEV-DO
Revision 0 and A high speed access. With “Transparent transmission” as core function and highly usability,
user can integrate it to system, to realize data transmission based on CDMA2000
2.2. Features
Support CDMA2000 1xEV-DO Revision 0 and A network
Support 2 connections online at the same time, support TCP and UDP
Support network register packet
Support heartbeat packet data, can send to net or serial port
Support remote setting via SMS
Work mode: SMS transparent transmission mode, Network transparent transmission mode and
HTTPD client mode
Support sending English/Chinese SMS with simple commands
Similar to RFC2217, can modify module serial parameters automatically
RS232/RS485 interface

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2.3. Parameters
Parameter
Value
Wireless
Parameter
Working Frequency
CDMA1X / 1xEV-DO rel.0/ 1xEV-DO rev. A
800 MHz /1900 MHz
Receive Sensitivity
<-106.5dBm
Max Launch Power
CDMA: 23dBm
Data Width
Downstream: 3.1Mbps Upstream: 1.8Mbps
Hardware
Parameter
Data Interface
RS232: 1200bps - 460800bps
RS485: 1200bps - 460800bps
Working Voltage
DC 5V~24V
Working Current
average current 55mA@12V;
peak current 230mA@12V
Operating Temp
-30~70 degree centigrade
Storage Temp
-40~85 degree centigrade
Dimension
103 x 105 x 28(mm)
Software
Parameters
Work Mode
Transparent transmission mode
Serial command mode
Setting Command
AT+command structure
User Configuration
setting software
Form 1 Module Parameters
2.4. Hardware Introduction
Figure 2 Hardware Interface

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2.5. Dimensions
Figure 3 Haredware Dimensions
3. Functions
This chapter introduce the functions of module, as the following diagram shown, you can get an overall
knowledge of it.

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Figure 4. Function Diagram
3.1. Parameters Setting
Power on, module will connect to the server, get into working mode and open serial port according to
pre-set parameters.
Preset parameters
Work mode
SMS transparent transmission mode/Network transparent transmission mode/Httpd client mode
Default connection parameters
Protocol
Destination IP
Destination Port
Serial parameters
Baud rate
Data bit
Parity bit
Stop bit
After setting above parameters, restart the DTU, it will work under your settings. Following chapters will
introduce each section.
3.2. Work Mode
There are 3 work mode in total:
SMS transparent transmission mode,
Network transparent transmission mode
Httpd client mode
3.2.1. SMS Transparent Transmission Mode
In this mode, users’ serial device can send SMS to cell phones. Or DTU receive the SMS by any phone
and forward the SMS to serial device.
No need to pay attention to the data conversion process between serial data and SMS, users can realize
transparent transmission between cell phone and serial device by simple settings.
<Note>
Data Transparent Transmission means, in the process of transmission, DTU will NOT do any conversion
on data, just clear transmission. Below is the same.
Setup by AT commands
1. Set work mode to be SMS transmit mode: AT+WKMOD=SMS
2. Set destination phone number: AT+DSTNUM=15866668888
3. Set filter SMS source phone number: AT+SMSFLT=ON

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Setup by software
1. Open setup software “USR-G760 USR-G760 V1.0.0.392” or more advanced version. Set UART
parameters according to the actual conditions and click “Open UART”
2. Click “Get All Param”, waiting until obtained all current parameters.
3. Choose “SMS transmission” in Choose work mode
4. Configure the “Destination” phone number as 400255652, choose the “SMS source number filter”.
5. Click “Set Save All Param”. After saving parameter, re-power the module.
3.2.2. Network Transparent Transmission Mode
In this mode, users’ serial device can send data to indicated server. Or DTU receive data from server and
forward the data to serial device.
No need to pay attention to the data conversion process between serial data and network data packet,
users can realize transparent transmission between server and serial device by simple settings.
USR-G760c support 2 socket connections online at the same time: socket A and socket B, they are
independent. This DTU only support working at TCP Client and UDP Client.
Setup by AT command
1. Set work mode to be network transmit mode: AT+WKMOD=NET
2. Set to enable Socket A: AT+SOCKAEN=ON
3. Set Socket A to be TCP Client: AT+SOCKA=TCP,test.usr.cn,2317
4. Set Socket A to be long link: AT+SOCKASL=LONG
Setup by software

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1. Open the software “USR-G760 USR-G760 V1.0.0.392” or higher version. Configure the COM port
parameters and click the “Open Serial”
2. Click “Get All Param”, waiting until obtained all current parameters.
3. Choose “Network transmission” in choose work mode.
4. Set IP&Port to be test.usr.cn; 2317, Link type to be TCP; Long
5. Click “Set Save all Param”, After saving parameter, re-power the module.
3.2.3. Httpd Client Mode
In this mode, users’ serial device can send request data to indicated HTTP server. Then DTU receive data
from HTTP server, analysis data and send the resault to serial device.
No need to pay attention to the data conversion process between serial data and network data packet,
users can realize data request from serial device to HTTP server.
<Note>
Some applications need the serial device to request data from HTTP server. But these places with serial
devices, maybe not convenient to access the Internet through a router. If there exist BS SIGNAL, we can build
a bridge for serial device and HTTP server with USR-G760c.
Setup by AT command
1. Set work mode to be HTTPD: AT+WKMOD=HTTPD
2. Set HTTP request method: AT+HTPTP=GET
3. Set HTTP request URL: AT+HTPURL=/1.php[3F]
4. Set HTTP request server: AT+HTPSV=test.usr.cn,80
5. Set HTTP request head information: AT+HTPHD=Connection: Keep-Alive[0D][0A]

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6. Set HTTP request time out time: AT+HTPTO=10
7. Set whether filter response information packet header: AT+HTPFLT=ON
Setup by software
1. Open the software “USR-G760 USR-G760 V1.0.0.392” or higher version. Configure the COM port
parameters and click the “Open Serial”
2. Click “Get All Param”, waiting until obtained all current parameters.
3. Select “HTTPD Mode” in Choose Work mode area.
4. Set HTTP request to be GET; HTTP URL to be “/1.php[3F]”; HTTP server address to be www.usr.cn;
HTTP server port to be 80; Over time (timeout) to be 10; HTTP request head to be “Connection:
Keep-Alive[0D][0A]”; Select “Filter HTTP head”
5. Click “Set Save all Param”, After saving parameter, re-power the module.
3.3. UART Frame Mechanism
3.3.1. Time Frame
When USR-G760c receive data from UART, it will keep checking the time interval of two adjacent bytes. If
the time interval is greater than or equal to a “time threshold”, the frame is finished. Or the module will keep
receiving data until data is greater than or equal to 1K, then send this frame to network by TCP or UDP packet.
The “time threshold” here is packet time interval, range from 50ms~60000ms, default 200ms.
This can be set by AT command: AT+UARTFT=<time>

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3.3.2. Length Frame
When USR-G760c receive data from UART, it will keep checking the received number of bytes. If the
number of bytes is greater than or equal to a “length threshold”, the frame is finished. Then module will send
this frame to network by TCP or UDP packet. The “length threshold” here is packet length, range from 1-1000,
default 1000.
This can be set by AT command: AT+UARTFL=<length>
3.4. Features
3.4.1. Registration Packet Function
When USR-G760c send network data, it can add some additional information to realize some special
functions. These additional information will be sent when establish TCP connection, or be insert into the front
of data packet.
Registration type: ICCID, MEID, CLOUD and USER
ICCID: The unique identifier of SIM card, suitable to the application based on SIM card identification.
MEID: The unique identifier of DTU, suitable to the application based on device identification, which
has nothing to do with installed SIM card.
CLOUD: The identification code based on USR CLOUD platform. By related parameters that have
access permission can realize USR CLOUD function.
USER: User defined data, suitable for user custom registration data.
3.4.2. Synchronize Baud Rate
This function is similar to RFC2217, that is to modify serial parameters from net side automatically. This
modification is temporary, will restore original parameters after restart.
Protocol Instructions
Protocol length is 8 bytes, detailed protocol as follows, example in HEX:

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UART Bit Instructions
3.4.3. Heartbeat Packet
In tranparent transmission mode, module can send heartbeat packet. Heartbeat packet can be sent to
both net server and serial device. The main purpose sending to net side is to keep connection with server, and
for these idle modules (not send data to server for a long time) to check if the connection status is valid. When
connection is abnormal, module detected unable to send heartbeat packet to server. If sending failed more
than 3 times, module will judge the connection abnormal and try to connect to server again. We suggest setting
this function ON.
In the application of server sending fixed query command to device, to reduce the traffic, user can choose
to send heartbeat packet(query command) to serial device instead of send query command from the server.
3.4.4. Indicator Light
The status indicator light of USR-G760c: POWER,WORK, STA, LINKA, LINKB
Name
Packet header
Baud rate
Bit
Checksum
Byte quantity
3
3
1
1
Description
3 bytes, to reduse
misjudgment
3 bytes mean a
buadrate value,
high bit in front
Different bit
means differently,
see below form
Checksum of the 4
bytes in front,
ignore carry bit
Example
(115200,N,8,1)
55 AA 55
01 C2 00
83
46
Example
(9600,N,8,1)
55 AA 55
00 25 80
83
28
Bit
number
Instruction
Value
Description
1:0
Data bit
selection
00
5
01
6
10
7
11
8
2
Stop bit
0
1
1
2
3
Check bit enable
0
disable
1
enable
5:4
Check bit type
00
ODD
01
EVEN
7:6
No defination
00
Pls write 0

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POWER: Keep ON, normal; OFF, abnormal.
WORK: Blink, normal; OFF, abnormal.
STA: This indicate the module working status. Keep ON after startup; Blink when connect with
network.
LINKA: This indicate the connection status of socket A. Keep ON when connecting; get OFF when
disconnect.
LINKB: This indicate the connection status of socket B. Keep ON when connecting; get OFF when
disconnect.
3.4.5. Reload by Hardware
By reload button, USR-G760c restore factory defaults or user set parameters
Reload to user default settings: Power on, press Reload button for 1-3s and release.
Reload to factory defaults: Power on, press Reload more than 6s and release.
3.4.6. Firmware Upgrade
Connect USR-G760c with PC by USB-RS232 cable, make sure the USR-G760c power is off now.
1. Open setup software “USR-G760 USR-G760 V1.0.0.392” or higher version, us default UART
parameters, select correct COM and click “Open Serial”
2. Click “Upgrade”, select correct firmware in the pop-up window
3. It shows “F,G,R” information in the software.
4. Press Reload button, power on USR-G760c, it will begin download firmware process, now release the
reload button. Until download finished, power off the USR-G760c. Then power on again.

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4. AT Command
4.1. Switch Command Mode
When module working in SMS transparent transmission mode, network transparent transmission mode or
HTTPD Client mode, it can switch to “AT command mode” by sending specific time-series data to serial port.
Also it can return to previous working mode by sending specific commands.
In above picture, abscissa axis is the timeline. Data on the above is send from device to module, data
under it is send from module to device.
Time requirement:
T1 > 200ms
T2 < 50ms
T3 < 50ms
T5 < 3s
The time series for switch to “AT command mode”:
Serial device send “+++” to module. Module will reply an “a” after receiving “+++”. Before sending
“+++”, for 200ms, can NOT send any data.
Serial device need to send an “a” to module after receiving the “a”.
Module will reply “+ok” to device after receiving the “a” and get into “temporary command mode”.
When device receive “+ok”, it knows the module is on “temporary command mode”, then it can send
AT command to module.
The time series for switch to previous mode:
Serial device send “AT+ENTM” to module.
Module send “OK” after receiving “AT+ENTM” and get into previous mode.
Device will know module get back to previous work mode when receiving “OK”

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4.2. Command Format
The AT command is “Query & Response” format, contains “Query” and “Response” parts.
“Query” is to send AT command, “Response” is to reply information.
<Note>
The characters in command are not case-sensitive.
4.2.1. Symbol Description:
<>
Contents included is required
[]
Contents included is non-essential
{}
Contents included is string with particular meaning in
this manual
~
Parameter range, example: A~B, range from A to B
CMD
Command code
OP
Operater
PARA
Parameter
CR
“Carriage Return” of ASCII code, expressed as 0x0D in
hexadecimal number
LF
“Line Feed” of ASCII code, expressed as 0x0A in
hexadecimal number
4.2.2. The Format of “Query” in Commands
Command string: <AT+>[CMD][OP][PARA]<CR>
Description of command type:
Command code
Defination
Essential or not
AT+
AT command head
Y
CMD
Function property of command
Y
OP
Operate code, such as=, ?, =?
N
PARA
Parameter of execution
N
CR
Carriage return, command terminator
Y
Type
Command string format
Instruction
0
<AT+><CMD>?<CR>
Execute command or query
current parameter
1
<AT+><CMD>=?<CR>
Query the range/type of
parameters in the command
2
<AT+><CMD><CR>
Execute command or query
current parameter value
3
<AT+><CMD>=<PARA><CR>
Set the parameter values for the
command

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4.2.3. The Format of “Response” in Commands
<Note>
There are 2 kinds of response information in commands: with echo and without echo.
With echo: When input commands, module will return the inputed contents, then response to the
command.
Without echo: Module will not return the inputed contents, just response to command.
Following instructions are without echo for examples:
Command string: [CR][LF][+CMD][OP][PARA][CR][LF]<CR><LF>[OK]<CR><LF>
Description of returned command type
4.2.4. Specific Symbol Instructions
In AT command, these are specific symbols:
=
,
?
CR
LF
Parameters can’t include these sumbols derectly, user need to escape in advance.
Escape regulation: use [] to enclose the HEX of specific symbols, means input an ASCII code which is
Command code
Defination
Essential or not
CR
Carriage return
N
LF
Line feed
N
+CMD
Response header
N
OP
Operater, such as:
N
PARA
The returned parameter
N
CR
Carriage return
N
LF
Line feed
N
CR
Carriage return
Y
LF
Line feed
Y
OK
Expressed operation succeed
N
CR
Carriage return
Y
LF
Line feed
Y
Type
Command string format
Instruction
0
<CR><LF><OK><CR><LF>
Return command succeed
1
<CR><LF><+CMD:><PARA><CR>
<LF><CR><LF><OK><CR><LF>
Return current parameter

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expressed by HEX code.
Example: the HEX code of ? is 0x3F, according to the escape regulation, it is expressed by [3F]
4.3. AT Instruction Set
Command
Function description
Executive instruction
AT
Test instruction
H
Help
Z
Restart
E
Query/Set whether open instruction echo
ENTM
Exit command mode
WKMOD
Query/Set work mode
CMDPW
Query/Set command password
STMSG
Query/Set module start information
Configurate parameter instruction
RELD
Reload to user default settings
CLEAR
Reload to factory defaults
CFGTF
Save current parameters as default settings
Information query instruction
VER
Query version
SN
Query SN code
ICCID
Query ICCID code
MEID
Query MEID code
Serial port parameter instruction
UART
Query/Set UART parameters
UARTFT
Query/Set UART packet time interval
UARTFL
Query/Set UART packet length
RFCEN
Query/Set whether support class RFC2217 function
Network instructions
APN
Query/Set APN information
SOCKA
Query/Set socket A parameter
SOCKB
Query/Set socket B parameter
SOCKAEN
Query/Set whether enable socket A
SOCKBEN
Query/Set whether enable socket B
SOCKASL
Query/Set whether enable socket A short connection
SOCKBSL
Query/Set whether enable socket B short connection
SOCKALK
Query link status of socket A
SOCKBLK
Query link status of socket B
SOCKATO
Query/Set timeout of socket A short connection
SOCKBTO
Query/Set timeout of socket B short connection
Registration packet instruction

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REGEN
Query/Set whether enable registration packet
REGTP
Query/Set the type of registration packet contents
REGID
Query/Set registration ID (for D2D application)
REGDT
Query/Set custom registration information
REGSND
Query/Set send type of registration packet
CLOUD
Query/Set registration parameters of cloud
Heartbeat instruction
HEARTEN
Query/Set whether enable heartbeat packet
HEARTDT
Query/Set data of heartbeat packet
HEARTTP
Query/Set send type of heartbeat packet
HEARTTM
Query/Set time interval of heartbeat packet
HTTPD instruction
HTPTP
Query/Set HTTP work mode
HTPURL
Query/Set URL
HTPSV
Query/Set destination server IP and Port
HTPHD
Query/Set HEAD information of HTTP protocol
HTPTO
Query/Set timeout time
HTPFLT
Query/Set wether enalbe filtering packet header
SMS instruction
DSTNUM
Destination phone number
SMSEND
Send SMS
CISMSSEND
Send SMS
SMSFLT
Query/Set wether enable filtering SMS source number
4.4. AT Instructions
4.4.1. AT
Function: Test command, used to test whether current device is active
Format:
Query:
AT+H{CR}
{CR}{LF}OK{CR}{LF}{CR}{LF}OK{CR}{LF}
4.4.2. AT+H
Function: help command
Format:
Query:
AT+H{CR}
{CR}{LF}help message{CR}{LF}{CR}{LF}OK{CR}{LF}
Parameters: