TWCT20 from Teltonika see here the datasheet TWCT20 of the manual TWCT20
Quad band: 850/900/1800/1900 MHz,
gives worldwide operation.
7A relay outputs, to drive heavy loads
Surge and reverse voltage protection on all the
inputs.
Two Analog inputs with mode selection, voltage mode
(0-10V) or current mode (4-20mA)
Turn ON/OFF the outputs by sending SMS
Alarm message service over SMS or email
Simple configuration through any web browser
DIN rail mounting, for easy integration in industrial
environment
4 LED's for input status, 4 LED's for output status
Dual color device status LED
24V power supply, ideal for use in heavy duty vehicles
like buses, trucks
Watchdog controller ensures reliable and continuous
operation
RS232 hardware interface.
Firmware upgrade possibility
Operating temperature range from -20°C to +55°C
DIN Rail Mounting
Dimensions 90x70,5x57,6 (mm)
Interface RS232 (RJ45 connector)
GSM antenna MMCX connector
SMS: Text mode
Wireless modem: Quad Band GSM
(850/900/1800/1900MHz)
Power 24V ±10%
2 analog inputs. (0 10V, 4-20mA, terminal blocks)
4 relay outputs (~250V, 7A, terminal blocks)
RS232 interface, Socket : RJ-45
Protocol HTTP, SMTP
Configurable with internal WEB server interface
Additional watchdog controller