Technical Support: h.usriot.com USR-GPRS232-734 User Manual File Version: V1.0.3.01 Jinan USR IOT Technology Limited

Technical Support: h.usriot.com Jinan USR IOT Technology Limited

Technical Support: h.usriot.com Brief Introduction USR-GPRS232-734 is GPRS DTU. User can realize the two-way data transparent transmission from the serial port to the network by simply configuring it. USR-GPRS232-734 supports identity packet, heartbeat packet, two socket connections. Support GSM850/900, DCS1800/1900 Support GSM/GPRS/EDGE; Support 2G flow of 2G/3G/4G SIM card Support two way network connections simultaneously; Support TCP and UDP Every connection supports 4KB Data Cache Support identity packet function Support heartbeat packet function Support configuring DTU parameters via SMS...

Technical Support: h.usriot.com Product link: http://www.usriot.com/p/rs485-gsm-modems-rs485-gprs/ USR-GPRS232-734 setup software, download address: http://www.usriot.com/usr-gm3-setup-software/ Figure 1 Download Page If user has any question, please submit it to customer center: http://h.usriot.com Data transmission diagram as follow: Figure 2 Data transmission diagram Jinan USR IOT Technology Limited

Technical Support: h.usriot.com Figure 3 Hardware connection diagram 1.2. Module Default Parameters Network transparent transmission mode test.usr.cn Work mode Server Address Server Port Serial Parameters Heartbeat packet Packet Data:www.usr.cn Figure 4 Default parameters 1.3. Basic Parameters Wireless Standards Wireless Parameters Standard frequency range Max. transmitted power GPRS Terminal Device Class GPRS Multi-slot Class GPRS Coding Schemes Antenna Hardware Parameters Data Interface Baud Rate Working Voltage Working Current Working Temp. Storage Temp. Jinan USR IOT Technology Limited

Wireless network type Work Mode Configuration Command Software Parameters Network protocol User Configuration Method DNS Software Functions Transparent Mode HTTP Heartbeat packet Baud rate synchronization Identity packet Technical Support: h.usriot.com Electrical isolation; ESD atmosphere: 15KV; Surge: 4KV(8/20us) GSM/GPRS/EDGE Network transparent transmission mode, SMS transparent mode and HTTPD Client mode Serial AT command, network AT command, SMS AT command Support Support HTTPD Client Mode Support Support Support Support user editable, ICCID, IMEI, ID Figure 5 Basic parameters 1.4. Hardware...

Technical Support: h.usriot.com LEDs of USR-GPRS232-734 are POWER, WORK, GPRS, LINKA, LINKB. LED Name POWER WORK GPRS LINKA LINKB Jinan USR IOT Technology Limited Module Status GPRS network is connected GPRS network is disconnected

Technical Support: h.usriot.com This chapter introduces the functions of USR-GPRS232-734, as the following diagram shown, user can get an overall knowledge of it. Figure 9 Functions diagram Different operator has different APN(access point name). If user uses the SIM card from the operator, user must know the APN. User can ask SIM card operator for APN information. There are three parameters about APN. They are APN code, username and password. Sometimes only configuring APN is enough. 2.2.1. Network transparent transmission Mode Network transparent transmission mode: Data from serial device will...

Technical Support: h.usriot.com Figure 10 Network transparent transmission mode USR-GPRS232-734 supports two socket connections simultaneously: socket A and socket B, they are independent. USR-GPRS232-734 only supports working as TCP Client and UDP Client. 2.2.2. HTTPD Client Mode HTTPD Client Mode: DTU will add the HTTP Header for every data package from serial device and transfer HTTP format data to network server. User needs to configure the HTTP Header before using this mode. User can use this mode transfer the serial data to HTTP server. Jinan USR IOT Technology Limited

Technical Support: h.usriot.com Figure 11 HTTPD Client mode DTU can’t work as HTTP server. 2.2.3. SMS transparent transmission mode SMS transparent transmission mode: Send serial data to mobile as SMS. The transmission is bidirectional. Figure 12 SMS transparent transmission mode Jinan USR IOT Technology Limited

Technical Support: h.usriot.com Baud Rate Data Bits Stop Bits Figure 13 Serial parameters 2.3.2. Serial package methods USR-GPRS232-734 adopts fixed packaging time-200ms. 2.3.3. Baud Rate Synchronization When USR-GPRS232-734 works with USR devices or software, serial parameters will change dynamically according to network protocol. User can modify serial parameters by sending data conformed to specific protocol via network. It is temporary, after resetting DTU, the parameters will back to original values. 2.4. Features 2.4.1. Identity packet function Figure 14 Identity packet diagram Identity...

methods to send identity packet.  Identity packet will be sent when connection is established. (Only for TCP client)  Identity packet will be added on the front of every data package. (TCP client and UDP client) USR-GPRS232-734-User-Manual Technical Support: h.usriot.com Types of identity packet: ICCID, IMEI and User.  ICCID, the unique identifier of SIM card, suitable to the application based on SIM card identification.  IMEI, the unique identifier of DTU, suitable to the application based on device identification.  User, user can use own editable identity packet. Identity packet can only...

Technical Support: h.usriot.com There are three ways to use AT commands to configure module and query parameters status. They are serial AT command, SMS AT command and transparent AT command. We also provide the setup software based on serial AT command. User can download the setup software from http://www.usriot.com/usr-gm3-setup-software/. Figure 15 Setup software 3.1. AT Command 3.1.1. Serial AT Command When module works in network transparent transmission mode, SMS transparent transmission mode or HTTPD Client mode, user can enter serial AT command mode. Then user can send AT command to module....

Technical Support: h.usriot.com User can configure module or query parameters status by SMS AT command to remotely control module in fields. Note: SMS AT command can achieve sending more than one AT command by only one message after firmware version V3.0. User can achieve it by add “;” after each AT command. Jinan USR IOT Technology Limited