Product Overview 
 As wireless communication technology, GPRS products in the field of data transmission is used widely, especially the emergence of GPRS Modem more to promote the development of this application. Based on providing a simple and practical solution for GPRS communication needs, communication development of this Kechuang DLK-M230 GPRS Modem, backward compatible with GSM networks. 
 Products, particularly for the industrial field of complex environments. Comply with EMC test specifications, to further simplify the interface design and external servo circuit, users RS-232 (Model DLK-M230), RS-485 (Model DLK-M231), TTL (Model DLK-M232) level interface, easy to use AT commands, you can complete end to end reliable data communication. 
 The user is faced with the AT command based on serial communication interface, saving development time and intensity. It also can be used as an integral part of the product and the product together. After many years of actual field product tests, you can rely on wireless data transmission terminal partner. 

 Industrial applications 
 Finance: Bank savings point of the engine room surveillance, mobile securities trading and information search 
 Communications: telecommunications room power environmental monitoring, communications, maintenance personnel line data inquiries 
 Transportation: GPRS / SMS / GPS motor vehicle monitoring and dispatching system; bank armored cars, postal vehicles monitoring and dispatching; taxis, buses and vehicle management group instruction, monitoring and dispatching. 
 Public Security: public security, 110, traffic police vehicle monitoring and dispatching, police mobile data (identity, criminal files, etc.) information, mobile data traffic (vehicles, drivers, files, etc.) query. 
 Heat: real-time monitoring and maintenance of thermal systems 
 Power: the city grid power system real-time monitoring and automatic compensation, automatic meter reading 
 Company: Mobile office and management, and other field staff mobility data query 
 Industrial: Industrial remote sensing, telemetry, remote control information return 
 Life: real-time data acquisition Gas regulator station automatic control, water and sewage pipe network real-time monitoring and maintenance. 

 Features 
 ◆ built SEIMENS MC37i wireless module 
 ◆ smallest of similar products for embedded integration and energy-saving mode, suitable for mobile devices 
 ◆ internal hardware and software watchdog, monitoring the operating status at any time, to ensure stable and reliable operation of the product 
 ◆ strong anti-interference, good housing package 
 ◆ Quick and easy to use, easy to install 
 ◆ common RS-232/RS-485/TTL level interfaces, voice-enabled 
 ◆ using a simple AT command interface 
 ◆ enables dial-up Internet, SMS text messages, CSD, voice and other services 
 ◆ enables point to point, multipoint, and CSD and other flexible networking 
 ◆ timing detection is in the communication state. If the time to stop communication, the device will reset connection 
 ◆ new status indication function; power status indication, system status indication, to bell instruction, send and receive data indicate 

 Technical parameters 
 RF characteristics: 
 The use of GSM phase 2 / 2 + standards 
 Dual: EGSM900 and GSM1800 
 Transmit Power: 
 Class 4 (2W) at EGSM900 
 Class 1 (1 W) at GSM1800 
 (800/1900MHz other special frequency can be customized) 

 Power: 
 Input voltage: DC5 ~ 25V (standard 9V power supply) 
 SIM card operating voltage: 3V/1.8V 
 Current consumption: 
 Talk mode: 300mA (average) 
 400mA (max) 
 Sleep mode: 3.0mA (max) 
 Idle mode: 10.0mA (max) 

 Features: 
 SMS: MT, MO, CB and PDU mode 
 Messaging content: support for digital, voice, SMS and fax 
 Module reset: The AT command or power-down reset 
 Maximum transfer rate: 14.4KBPS 
 Audio decoding standards (three rates): 
 Half speed (ETS 06.20), full speed (ETS 06.10) 
 Enhanced full-speed (ETS06.50/06.60/06.80) 

 Volume: 
 Without mounting holes and interface: 64 * 46 * 18.5mm 
 With mounting holes and interface: 78 * 66 * 18.5mm 
 Weight: 200g 

 Appearance: 
 Shell package: 
 Good electromagnetic shielding and metal shell, durable; anti-electromagnetic interference, extremely high-temperature heat capacity 
 Interface: Standard RS-232/RS-485/TTL level, DB9 Interface 
 Antenna: 50ohm/SMA/Female 

 Environment: 
 Operating temperature: -40 ℃ ~ 65 ℃ 
 Automatic shutdown:> / +70 ℃ 
 Storage temperature: -50 ℃ ~ 85 ℃ 
 Humidity: ≤ 90% 
 Magnetic compatibility: Electrostatic discharge immunity test level: 3 
 Radio frequency electromagnetic radiation: the immunity test level: 3