The WERNER WN0525 (3G SMS Remote Alarm Monitoring) is a multi I/O port remote terminal unit, thorough the RS232/485 port can connect intelligent meters or PLC. It is special for BTS monitoring, remote data acquisition, telemetrically, BTS access control and other applications. It supports voice communication, SMS,GPRS, 3G communications.


  • Widely Rated voltage range, 9~36VDC
  • 4G SD card for save historical data, USB port for configuration and upgrade firmware
  • 6 analog inputs, 12bits, supports 0-5V,0-20mA,4-20mA
  • 4 Relay outputs, 5A/30VDC, 5A/250VAC
  • 8 digital inputs, dry contact or level input
  • 1 temperature probe input, 1 humidity transducer input
  • Automatically resend the data while communication failure,GPRS failure will alert by SMS text
  • Supports remotely restart the RTU and configure it by SMS commands remotely
  • 10 SMS Alert and auto dial numbers, can program to receive the specified alarm message

The WN0520 can be used as remote access control. The authorized users can open the gate or turn on the machine at a specified time.

It supports Modbus TCP, TCP/UDP protocol, transparent data transmission over GPRS/3G, performs as Modbus Slave.

Typical Application

Application Diagram


Item Reference Scope
DC Power Supply Standard adapter: DC 12V/1.5A Range 9-36VDC
Power consumption Standby: 12V/70mA Working Max.: 12V/300mA
GSM Frequency 850/900/180/1900Mhz
No. of Digital Inputs 8 Digital Input, NC/NO/Edge/Level type, Can be used as Pulse Counters
No. of Analog  Inputs 6 Analog Inputs. 12 bit resolution, 0-5V or 0-20mA or 4-20mA
No. of Relay Outputs 4, Rated: 5A/30VDC, 5A/250VAC
No. of Configurable Mobile number 10 Mobile Phones numbers
Transmit power Class 4 (2W) at EGSM 900 and EGSM 850/ Class 1 (1W) at GSM 1800 and GSM 1900
GPRS connectivity GPRS multi-slot class 10
GPRS Data Transmission GPRS data downlink transfer: max. 85.6 kbps

GPRS data uplink transfer: max. 42.8 kbps

Coding scheme: CS1-1, CS-2, CS-3 and CS-4

Security Password Protected access
Real Time Clock Date time with battery backup
I/O Status Remote I/O query through SMS
SIM interface Supports 3G SIM Card
Indicators Power, Signal Low, Alarm status, Armed & RS232 communication.
External antenna SMA Antenna interface, 50 Ohm
Serial Interfaces 1 USB Port
Protocols SMS, GPRS UDP, TCP, Modbus RTU, Modbus TCP and more equipment protocols can be added according to requirements.
RS232/485 1 RS232 and 1 RS485, Support Transparent transmission.
Temperature & Humidity Inputs Temperature range: -40οC to + 80οC. / Humidity Range: 0~100%RH
System Health Check Remote by SMS & Auto by specify timing /date
Power Outputs 1 Port, for external device
Memory Capacity Internal Memory inside, can save the data for 1000 events.
Backup Battery 3.7V 1200mAH ( Optional )
Temperature range -10-+70οC
Humidity range Relative humidity 95% (condensation free)
Exterior dimension 168mm*113mm*32.3mm
Net Weight 1000g

User Friendly Configuration Software

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