GSM key



  • GSM900/1800/1900 MHz relay management device
  • No domain restriction for sending the command
  • Management of one relay output with NO contacts with free call
  • Adjustable time interval of relay output activating after the call
  • Up to 200 GSM numbers that can control relay output
  • Adjustment through SMS or RS232
  • RS232 DCE serial interface
  • Power supply range 8 do 30VDC
  • DIN 35mm rail mounting 



GSM Key is GSM relay management device that uses GSM network for managing one relay output with free call. Managing of relay output is allowed to numbers defined in list that can contain up to 200 GSM numbers. It is possible to adjust the device with  SMS, and to get report about digital input status. Standard RS232 connector is used for simple adjusting of parameters through PC terminal.  Antenna is connected on female  SMA 50Ω connector. State of the device is indicated with four LED diodes. Device is powered with 8V to 30V dc voltage and is suitable for DIN 35mm rail mounting.




-      Managing (open/close) electrical gates and barrier gates with free call

-      Door opening and switching lights in objects with interphone systems with free call (buildings, companies ...).

-      Using cell phone as remote controller.



GSM key enables remote management by one free call using one relay output. Device can be configured to send SMS about status changes on digital input. Input and output are galvanicaly isolated, thus enabling easy implementation into system. Relay output has high current capacity, so it can directly drive devices working on 220V. 


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Technical specifications


Tri-Band GSM/GPRS 900/1800/1900 MHz

Compliant with GSM phase 2/2+ standard
Output power Class 4 (2W at 850/900MHz); Class 1 (1W at 1800/1900MHz)
SIM card Mini SIM, 1.8V/3.0V
Serial interface RS232 DCE configuration, DB9 female
Serial baud rate in command mode 9600 bps, 8N1
Digital inputs

1 input with conjoint bulk

Nominal 12V DC – 24V DC max 30V DC

Logic 0 – Input voltage < 4V DC

Logic 1  - Input voltage >5V DC
Relay outputs

1 relay with NO contacts, 5A, 30V DC / 250V AC

Working in puls mode with interval of 10ms to 11min
Antenna connector SMA female, GSM 50Ω antenna with 3m cable included
LED indication Power ON, GSM ON, Ready, Busy
Power supply DC power supply, from 8 to 30V
Power supply and I/O connectors Pluggable screw clamp, 2.5mm2
Power consumption Standby 0.2W, max 3W
Dimension 70 x 85 x 58 mm (without connection blocks)
Weight cca 150g
Protection IP40
Temperature range -20°C to +75°C, 0 to 95% RH (non condensed)
Mounting DIN 35mm rail