RS232 / RS485 GSM GPRS Modem Supports SMS command

USR-GPRS232-730 is a RS232/RS485 to GSM modem, which used for data transparent transmission based on 2G Network.

  • 1 RS232 serial port and 1 RS485 serial port (not use simultaneously)
  • Power: 5V~36V
  • Quad-Band GSM/GPRS 850/900/1800/1900MHz
  • Flow Control: CTS/RTS
  • Work Mode: TCP/UDP Client
General Details

Introduction of RS232 / RS485 GSM Modem

USR-GPRS232-730 GSM Modem / GPRS DTU (Data Transfer Unit) is a wireless terminal equipment which can convert serial data to IP data or convert IP data to serial data through gprs /GSM network. 730 is based on USR-GM3. Clients can use this product to realize bidirectional transparent transmission from serial port to network through simple AT command.

730串口图 (1)

Port of  RS232 / RS485 GSM Modem

730串口图 (2)

Features of RS232 / RS485 GSM Modem

  •  RS232 or RS485 interface, can’t be used at one time
  • 2G Frequency: GSM850/900,DCS1800/1900, 2G GSM/GPRS
  • Work Mode: TCP and UDP Client
  • Supports register packet and heartbeat packet
  • Can be remote configurated via SMS
  • Support multi work modes : SMS transmission mode,network transmission mode and HTTPD mode
  • Support basic instruction set and extension instruction set
  • Hardware flow control RTS/CTS

Functions of RS232 / RS485 GSM Modem


Application of RS232 / RS485 GSM Modem


  • 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





StandardGSM / GPRS
Rate14.4 Kbps ~ 57.6 Kbps
Standard Frequency Range850/900/1800/1900MHz
GPRS Multi-slot ClassGPRS Class 10
GPRS Terminal Device ClassClass B
GPRS Coding SchemesCS1 ~ CS4
Max Launch PowerGSM900 class4 (2W), DCS1800 class1(1W)
ApplicationGSM standard AT instruction set / USR extension AT instruction set / data transmission / SMS transmission
Network ProtocolTCP, UDP, DNS, Http
Network Link Count4
Disconnection Buffer4 x 15K bytes
Network Receive Buffer4K byte
Port Number2 (1*RS-232, 1*RS-485, can not work at the same time)
Interface StandardRS-232: DB9 cellular type, RS-485: 2 wire (A+, B-)
Data Bit5, 6, 7, 8
Stop Bit1, 1.5, 2
Check BitNone, Even, Odd
Baud RateUART: 2400 bps ~ 921600 bps
Flow ControlRTS/CTS
Receive Buffer4K byte
RS-485 Pull-up and Pull-down Resistor2.2 KΩ
Device Interface
Antenna Interface50Ω/SMA-K (female terminal)
SIM Card1.8V / 3V
Speech InterfaceNull
Virtual Serial(USR-VCOM)Windows 2000 or higher (32 bit/64 bit)
ConfigurationSerial AT command, network AT command, SMS AT command
Basic Parameter
Size80x 84 x 25(mm)
Operating Temp.-25 ~ 85°C
Storage Temp.-40 ~ 125°C
Input VoltageDC 5 ~ 36 V
Working CurrentAverage: 22 ~ 45mA, Max: 201mA
Warranty2 years
Accessory12V1A power, serial line, GPRS sucker antenna
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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