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KB3051 embedded GPRS DTU (Data Terminal Unit) is wireless data transmitting terminal of GPRS/SMS and embedded with High reliable ARM7 CPU.
Based on the public net, KB3051 GPRS DTU transmit widely, stably and reliably, KB3051 GPRS DTU is widely used in unattended operation device, Remote AMR, remote data acquisition, remote AMR, remote scheduling and so on. Due to this product is designed for industry integrated, we adopt special designs in the temperature scope, shaking, EMC and interface multiform and so on, to keep it good stability in the severe atmosphere, ensure high quality for your device.
Aim at different scope user’s requirements to supply different define GPRS Terminal unit, it needs taking industry characteristics for developing on hardware & software and system integration. GPRS mobile net can supply TCP/IP connection; GPRS DTU can be use for internet connection, data transmitting application and so on. KB3051 GPRS DTU (Data Terminal Unit) is special GPRS wireless device that send the data from COM port through GPRS mobile data network.
KB3051 GPRS DTU is used in electric power automatic system, industry monitoring, traffic management, atmosphere, pro-environment, pipe network monitoring, finance, securities departments and so on. Consider the networking request from different application scope, achieve Virtual data private network in network structure. It is applicable toand medium data transmitting of the Center to multi-points, multi-points scatter.

• Standard industrial products, EMC anti-jamming design, strong adaptiveness.
• Independent research and developing, embedded 32 bit ARM7-CPU with real-time operating system.
• Embedded Watchdog chip, provide multiple Reset mechanism, can be controlled by software, achieve industrial security mechanism perfectly.
• Working Frequency adopt900MHz/1800MHz which is suit for most countries all over the world except North America and South America;
• Advanced and strict data communication protocol, with the function of correction and encryption. Never lose package when data transmission, can achieve pictures over than 100K and Flash animation files transmission, no Mosaic happened.
• Various working mode: DTU (default), Modem, SMS Modem. DTU mode is GPRS data transmission which can get the data from device’s COM port (RS232/RS485/TTL) and transmit to the server in Internet. It also can receive SMS Message when DTU mode (it needs to switch IO port to SMS when send message). SMS Modem is SMS transmission mode, user can set to type A (with protocol) or type B (transparent). When set to Modem, compatible standard AT command (GSM07.05 and 07.07). user can write AT command software to realize the function user need.
• DTU and SMS Modem can switch through User configuration software and also can change the working modem through IO port. Set the parameter of Modem mode must after it is power-on.
• SMS Modem feature:
• Various networking ways: Under SMS Modem, the device with protocol (A) can network with the device without protocol (B), the device with protocol (A) also can network with the device with protocol (A).
• Under SMS Modem, KB3051 can receive and send the MAX data 1024 bytes a time.
• Under SMS Modem, support Sending and Receiving Data form: hex, ASCⅡ, UCS2. User is advised to set this parameter through our configuration software before use it.
• Various networking ways: KB3051 can work with NET Converter KB2000 and KB3051 (it is convenient to use GPRS without internet). This can achieve networking of peer to peer, center to multi-points.
• Plug and play: when work with KB2000 or KB3051 of our product, no need to develop any software and hardware, can build large SCADA system.
• Automatical IP register mechanism, can achieve various server modes, build complete super large SCADA system.
• Remote sleep and awake: User can use appointed cell phone number to dial or send message can sleep or awake DTU, it is convenient for user to save a lot of GPRS Flow Fee when no need to use DTU.
• Remote modify DTU parameters: Support that SMS and data service center modify DTU parameters.
• IO switching value function: Two channels input, two channels IO output. Remote control and reading. Alarm status threshold, automatic alarm signal report function.
• Strong communication backup function: Support automatic switching between main server and backup server, support TCP and UDP automatic switchover (now don’t have TCP and UDP automatic switching function). It will connect to backup server when main server has problem, and will take UDP to communication once TCP off line.
• Strong server software support, application for many years, strong function.
• Support special APN, data center support fixed IP and DDNS.
• Working temperature range: -40℃-80℃, communication is not effected at -40℃.

3. Technical Specification

3.1 GSM/GPRS:

Frequency Band: EGSM900MHz/DCS1800MHz
GPRS Multi-slot Class 12
GPRS Mobile Station Class B
GPRS Coding: CS1~CS4
Output Power: Class 4 (2W) at GSM850MHz and GSM900MHz
Class 1 (1W) at DCS1800MHz and PCS1900MHz
Sensitivity: <-107 dBm (typ.) at GSM900 MHz <-107 dBm (typ.) at DCS1800MHz
Compatible standard AT command（GSM07.05 and 07.07）
Support extend command
Support SMS、USSD、CSD
Embed TCP/IP Protocol

Embed TCP/IP Protocol
Embed standard AT command（GSM07.05 and 07.07）
Support extend command
Support SMS、USSD、CSD
Transparent data transmitting
Support IP address or domain name
Support special APN

3.3 Electric Specificity

Work Voltage: DC 3.9V
Power:
Standby: < 25mA@5V
Communicating: < 120mA@5V
Peak point current: 1.5A@5V

Working Temperature: -40℃～80℃
Storage Temperature: -45℃～125℃
Relative Humidity： 20%~ 95%（No Condensation）

4. Appearance and Interface

. Size: 82mm(L)*59mm(W)*25.2mm(H)
. Pin space: 2.0mm
. Weight: 17g

Pin statements
RST: The terminal is reset pin, giving RST a low level can reset KB3051
CTS: Hardware flow control pin, Clear to send
DTR: Hardware flow control pin, Data terminal ready
RTS: Hardware flow control pin, Request to send
GPRS/SMS: GPRS or SMS optional Pin, when set it high, then work in GPRS for communication; when set it low, then work in SMS for communication.
Output1: IO output terminal, the IO terminal is standard 3.3V electrical level, can use to output high or low electrical level
Output2: IO output terminal, the IO terminal is standard 3.3V electrical level, can use to output high or low electrical level
Input1: IO input terminal, can input standard 3.3V electrical level, for monitoring statue.
Input2: IO input terminal, can input standard 3.3V electrical level, for monitoring statue.
TXD: Serial port output terminal, connect with user’s serial port receiving point; Baud rate: 300 ~ 115200 BPS;
RXD: Serial port input terminal, connect with user’s serial port output point; Baud rate: 300 ~ 115200 BPS;
STATUS: Statue indication, when high electrical level, it means module start and enter to work status, when low electrical level, it means module is closed. When its configuration mode, the pin is high level
DCD: Hardware flow control pins, the data is ready.
RI: Hardware flow control pins, rang the bell detection.
SIM_RST: The Reset of SIM card, if users needn’tuser-defined SIM case, then hangs the feet in the air.
SIM_CLK: The Clock of SIM card, if users needn’t user-defined SIM case, then hangs the feet in the air.

SIM_VDD: The power supply of SIM card, Max current flow is 10mA, if users needn’t user-defined SIM case, then hangs the feet in the air.
GND: Module ground,
VBAT: 3.9V, The foot voltage range: 3.4VDC～4.5VDC, When normal situation, 3.8V~4.2V will be the best; Under the poor signal, the largest peak point current can reach 1.5A. When PCB design, we s est line width: ≥40mil
VIN: The foot is a serial port level feet, if users need to choose a serial port level for 5V TTL input, then input 5V; If users need to serial level of 3.3V CMOS, then input 3.3V.

5. Working mode switch

KB3051 default value is DTU modem, the way of switch working mode as below:
1. Switch to SMS modem: it has two ways, when under DTU mode, can change the device type to SMS modem when set DTU parameters. Another way is that switch the IO port (put the Pin 10 to low) to change the working mode.
2. Switch to Modem mode: when run the product, put AT command: AT+QLOCPU=0 to change working mode to Modem.
3. Switch to DTU mode: it has two ways, when under SMS Modem, can switch the IO port (put the Pin 10 to high) to change the working mode to DTU. Another way is under Modem, put AT command: AT+QLOCPU=1 to change working mode to DTU when run the product.