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GPRS Module in Automatic Meter Reading System for Wireless Data Collecting RS232
Introduction of RS232 / RS485 GSM Modems
This is a RS232/RS485 to gprs dtu, used for data transparent transmission. 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
1.Application in public server
2.Use network to extend serial communication distance
3. Server transit mode
Parameter
| Network | |
| Standard | GSM / GPRS |
| Rate | 14.4 Kbps ~ 57.6 Kbps |
| Standard Frequency Range | 850/900/1800/1900MHz |
| GPRS Multi-slot Class | GPRS Class 10 |
| GPRS Terminal Device Class | Class B |
| GPRS Coding Schemes | CS1 ~ CS4 |
| Max Launch Power | GSM900 class4 (2W), DCS1800 class1(1W) |
| Application | GSM standard AT instruction set / USR extension AT instruction set / data transmission / SMS transmission |
| Network Protocol | TCP, UDP, DNS, Http |
| Network Link Count | 4 |
| Disconnection Buffer | 4 x 15K bytes |
| Network Receive Buffer | 4K byte |
| Serial | |
| Port Number | 2 (1*RS-232, 1*RS-485, can not work at the same time) |
| Interface Standard | RS-232: DB9 cellular type, RS-485: 2 wire (A+, B-) |
| Data Bit | 5, 6, 7, 8 |
| Stop Bit | 1, 1.5, 2 |
| Check Bit | None, Even, Odd |
| Baud Rate | UART: 2400 bps ~ 921600 bps |
| Flow Control | RTS/CTS |
| Receive Buffer | 4K byte |
| RS-485 Pull-up and Pull-down Resistor | 2.2 KΩ |
| Device Interface | |
| Antenna Interface | 50Ω/SMA-K (female terminal) |
| SIM Card | 1.8V / 3V |
| Speech Interface | Null |
| Software | |
| Virtual Serial(USR-VCOM) | Windows 2000 or higher (32 bit/64 bit) |
| Configuration | Serial AT command, network AT command, SMS AT command |
| Basic Parameter | |
| Size | 80x 84 x 25(mm) |
| Operating Temp. | -25 ~ 85°C |
| Storage Temp. | -40 ~ 125°C |
| Input Voltage | DC 9 ~ 24 V |
| Working Current | Average: 22 ~ 45mA, Max: 201mA |
| More | |
| Warranty | 2 years |
| Accessory | 12V1A power, serial line, GPRS sucker antenna |
