RS232 / RS485 GSM Modems Support GSM/GPRS

USR-GPRS232-730 is a RS232/RS485 to gprs dtu,used for data transparent transmission.

  • 1 RS232 serial port and 1 RS485 serial port (not use simultaneously)
  • Operation temperature Range of -25℃ ~85℃
  • Quad-Band GSM/GPRS 850/900/1800/1900MHz
General Details

Introduction of RS232 / RS485 GSM Modems

This is a RS232/RS485 to gprs dtu, used for data transparent transmission. USR-GPRS232-730 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 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.

Features of RS232 / RS485 GSM Modems

  • Support RS232/RS485 interface, choose before purchase;
  • Support GSM850/900,DCS1800/1900
  • Support GSM/GPRS and 2G/3G/4G card, but don’t support 3G/4G network
  • Support TCP and UDP
  • Support register packet and heartbeat packet
  • 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 class RFC2217, can dynamically modify serial parameter of module via network
  • Support hardware flow control RTS/CTS

Function Structure of Low Power Gsm Modules


Application Field of RS232 / RS485 GSM Modems

m2m gsm module
  • 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

Application of RS232 / RS485 GSM Modems

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

Images of RS232 / RS485 GSM Modems

RS232 / RS485 GSM Modems

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 9 ~ 24 V
Working CurrentAverage: 22 ~ 45mA, Max: 201mA
Warranty2 years
Accessory12V1A power, serial line, GPRS sucker antenna









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