RS485 Industrial Cellular Modems | RS485 Serial GSM Modems

RS485 Serial GSM Modem

Model: USR-GPRS232-734

USR-GPRS232-734 is a RS485 Serial GSM Modem, used for data transparent transmission.
  •  1 RS485 serial port
  • Operation temperature Range of -25° ~85°
  • Quad-Band GSM/GPRS 850/900/1800/1900MHz

RS485 Industrial Cellular Modems | RS485 Serial GSM Modems

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

RS485 Serial GSM Modem Application in public server

2.Use network to extend serial communication distance

RS485 Serial GSM Modem Use network to extend serial communication distance

3. Server transit mode

RS485 Serial GSM Modem, Server transit mode


Wireless Parameter
Wireless Standard GSM/GPRS/EDGE
Standard Frequency Band 850/900/1800/1900MHz
Transmitted Power GSM900 class4 (2W)
DCS1800 class1 (1W)
GPRS Terminal Device Class Class B
GPRS Multi-slot Class GPRS Class 10
GPRS Coding Schemes CS1 ~ CS4
Antenna Option SMA interface
Hardware Parameter
Data Interface RS485 level, 5.08*3 terminals
Baud Rate 2400bps - 921600bps
Working Voltage DC 5V~36V
Working Current 59mA ~ 65mA (12V)
Operating Temp. -25° - 85°
Storage Temp. -40° - 125°
Size 82.5 * 86.0 * 24.0 mm
RS485 reliability Electrical Isolation
ESD air 15KV
Surge 4KV (8/20us)
Software Parameters
Wireless Network Type GSM/GPRS/EDGE
Working Mode Transparent transmission mode, SMS transparent transmission mode and HTTPD mode
Setting Command AT+ Command structure
Network Protocol TCP/UDP/DNS/HTTP
Max. TCP Connection 2
User Configuration Serial AT command, network AT Command, SMS AT Command
User Internet Applications Support custom application software
Software Functions
DNS Support
Simple Transparent Transmission mode Support TCP Client /UDP Client
HTTP protocol transmission Support
SMS transparent transmission Support
Heartbeat Package Support
Class RFC2217 Support
Registration Package Mechanism Support custom/ICCID/IMEI registration package


How to Buy

Official Online ShopClick to order USR-GPRS232-734
Alibaba Online ShopClick to order USR-GPRS232-734
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