RS485 GSM Modems, RS485 to GPRS

USR-GPRS232-734 is a RS485 to gprs modem, used for data transparent transmission.

  •  1 RS485 serial port
  • Operation temperature Range of -25° ~85°
  • Quad-Band GSM/GPRS 850/900/1800/1900MHz
General Details


USR-GPRS232-734 is a new GPRS device developed by USR IOT in 2016. Maturation software functions, covering mostly conventional application scenarios. Users can realize Serial to Network bidirectional transparent data transmission via simple configuration. Supporting custom registration package, heart beat package. Supporting 2 Socket Connection, and USR cloud join in.

USR-GPRS232-734 use DC power supply and terminal power supply, supporting 5.0V~36.0V wide voltage power supply. RS485 circuit using electrical isolation scheme, has anti-interference ability, suitable for strong electromagnetic interference environment, such as utility industry.


  • Support:GSM850/900,DCS1800/1900,able to be used around the world
  • Support GSM/GPRS/EDGE and 2G/3G/4G card, but don’t support 3G/4G network
  • Each connection support 4KB data cache, when in abnormal connection choosing data cache to avoid data lost
  • Support sending registration package and heartbeat package data
  • Support remote configuration via SMS
  • Support multi work modes: SMS transmission mode, network transmission mode and HTTPD mode
  • Support basic instruction set and extension instruction set
  • Support establishing, maintaining and closing network connection by using extension instruction set, more flexibility in application
  • Support sending Chinese/English SMS via simple instructions, avoiding PDU sending Chinese SMS which complex and hard use
  • Support class RFC2217,can modify module serial parameter via network dynamically
  • Support wide voltage 5~36V power supply, using DC power supply and terminal power supply
  • RS485 circuit using electrical isolation scheme, has anti-interference ability

Application Field

  • Power industry: power remote meter reading, substation monitoring, power line monitoring
  • Municipal industry: street lamp remote monitoring management, pipe network remote monitoring, urban energy consumption monitoring
  • Oil industry: remote monitoring of oil-gas well, GPRS remote oilfield automation detection monitoring system, Gas pipe network monitoring system solutions
  • Environmental protection industry: pollution sources monitoring, atmospheric environment monitoring, noise monitoring, dust monitoring
  • Agricultural application: greenhouse remote monitoring and management, aquaculture monitoring management, agricultural water pump monitoring management


1.Application in public server
of serial gprs converter
2.Use network to extend serial communication distance
gprs to rs232
3. Server transit mode
gprs to rs485

Wireless Parameter
Wireless StandardGSM/GPRS/EDGE
Standard Frequency Band850/900/1800/1900MHz
Transmitted PowerGSM900 class4 (2W)
DCS1800 class1 (1W)
GPRS Terminal Device ClassClass B
GPRS Multi-slot ClassGPRS Class 10
GPRS Coding SchemesCS1 ~ CS4
Antenna OptionSMA interface
Hardware Parameter
Data InterfaceRS485 level, 5.08*3 terminals
Baud Rate2400bps - 921600bps
Working VoltageDC 5V~36V
Working Current59mA ~ 65mA (12V)
Operating Temp.-25° - 85°
Storage Temp.-40° - 125°
Size82.5 * 86.0 * 24.0 mm
RS485 reliabilityElectrical Isolation
ESD air 15KV
Surge 4KV (8/20us)
Software Parameters
Wireless Network TypeGSM/GPRS/EDGE
Working ModeTransparent transmission mode, SMS transparent transmission mode and HTTPD mode
Setting CommandAT+ Command structure
Network ProtocolTCP/UDP/DNS/HTTP
Max. TCP Connection2
User ConfigurationSerial AT command, network AT Command, SMS AT Command
User Internet ApplicationsSupport custom application software
Software Functions
Simple Transparent Transmission modeSupport TCP Client /UDP Client
HTTP protocol transmissionSupport
SMS transparent transmissionSupport
Heartbeat PackageSupport
Class RFC2217Support
Registration Package MechanismSupport custom/ICCID/IMEI registration package
All USR products will be tested by R&D first, then production test again.(ESD Test,Surge/EFT Test, High/Low Temperature Test, EMC and LVD environment reliability test, etc.) Click here to watch test videos.
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USR products are exported to more than 100 countries and regions, get approvals like CE, FCC, ROHS, CCC, KC, IC, SRRC, etc.
USR product certificate
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