SAT120 Satellite/Cellular Modem and RTU

The SCADALink SAT120 is a versatile low-power satellite and cell terminal. It is a SCADA device that provides Modem, RTU, and Alarm Callout functionality in a single product. It is designed for remote SCADA communications, monitoring I/O and RS232 / RS485 serial devices. Dual mode satelllite and cellular operation with automatic fail-over in a single integrated device makes the SAT120 ideal for SCADA or mobile applications requiring high availability.

SAT120 with DIN-Rail

SAT120 Modem

  • Remote connectivity to serial devices such RTU, PLC, Flow Computers, and Data Loggers from the customers centralized SCADA application.
  • Satellite modem with 2 serial ports: COM0(RS-232) and COM1(RS-485).
  • Serial ports accessed as IP socket connections in IPMux or Virtual Serial Mode via the SatSCADA Server for SCADA communications.


The SAT120 has Modbus RTU function for monitoring integrated I/O or Serial Connected I/O.  Integrated I/O consists of 4 universal inputs ( AI/DI/D0) , Supply Voltage, & RTU Temperature. External serially connected devices can be polled by the SAT120 Modbus Master using Modbus RTU protocol on COM0 (RS232) or COM1 (RS485) serial ports and mapped to the SAT120 Modbus Register Map.  The SAT120 concentrates all data in a single Modbus register map and TAG database.

SAT120 Alarm Callout

SAT120 can be configured to generate callout messages on Alarm Conditions on configured tag points in the SAT120. Alarm Callout Feature of the SAT120 can be utilized to provide Alarm Callout function from a single alarm point connected to integrated SAT120 I/O to multiple Modbus registers polled from RTU/PLC at larger remote facilities.

When an Alarm Callout message is generated, all TAG point data is updated along with the TAG point that generated the alarm. Callout Messages are sent from SAT120 to the SatSCADA Server where customers can interface from their SCADA Host via the SatSCADA Client using modbus or monitored using the SatSCADA Notifier to generate email or SMS notifications. SAT120 works with SCADALink SatSCADA Server software to provide a complete end-to-end satellite networking solution, allowing SCADA Hosts to reach SAT120 terminals located anywhere in the world.

SatSCADA Server/Gateway

SatSCADA Server acts as a network bridge to provide Customer SCADA Host with easy, secure access to remote SAT120 units. Client provides secure Authenticated Access to Customer’s Terminal via HTTPS (No VPN required) Server provides Monitoring and Alarm Notification function when a customer does not have or want to interface to their own SCADA Host system. Server can be configured as Modbus Slave or Full Transparent Data Mode.

Dual Mode Satellite/Cellular Communications with Automatic Fail-Over

The SAT120 Terminal has dual mode Satellite/Cellular communications functionality.  It can be used in Satellite Only, Cellular Only, or Sat/Cell Automatic Failure Mode.



Main Benefits

  • Dual SAT/Cellular links
  • Global Satellite Coverage via Inmarsat network
  • Dual SIM card cellular
  • Low Power modes for solar or remote-powered applications
  • Multi-function device: modem/RTU/alarm callout all in one unit
  • Serial interface to PLC/RTU/EFM/Data Logger
  • 4 integral I/O (AI / DI / DO) for standalone or RTU operation
  • Modbus Master or Slave
  • SatSCADA Server provides Alarm Callout and full transparent datalink to remote devices
  • SatSCADA Client connects Customer SCADA Host to SAT120
  • Alarm Callout: Modbus interface and alarming on exception
  • Secure authenticated connectivity without VPN
  • Certified for hazardous location: Class I Div 2


  • Two way, near-real time messaging (up to10kbytes to the device, 6.4kbytes from the device)
  • Serial Communications: 2 RS-232, 1 RS-485 and USB port
  • Broadcast to multiple SAT120 units
  • Rugged, customizable, environmentally-sealed terminals for Outdoor Installation
  • Low latency: <15 seconds for typical messages
  • Integrated GPS for location-based services
  • SAT-1xx-TB1 inteface board for connecting to analog, digital and serial devices
  • SatSCADA GUI enables remote and local configuration

High Messaging Capability

  • Send and receive more data to allow better visibility of remote units
  • Communicate information to remote workers & assets where previously not affordable or available

Best Value

  • Equip fleets and asset groups of all sizes with competitive hardware and airtime pricing
  • Accurately budget communication costs without roaming charges
  • Robust and Reliable Service
  • Receive notification of events within seconds
  • Install customizable, environmentally-sealed terminals anywhere, even in harsh environments


Inputs4 configurable integral I/O: AI / DI /DO, 2 Internal I/O: Voltage & Temp, GPS Position
Serial PortsOne RS232 and One RS485
Power9 to 32 VDC
Temperature-40 to 85 degrees C
Dimensions5.35″ (L) x 4.52″ (W) x 1.61″ (H) / 136 mm (L) x 115 mm (W) x 41 mm (H)
With DIN-Rail: 4.52″ (W) x 2.36″ (H)
TerminationsTerminal block connections for 18-22 AWG
CertificationCSA Class I Div 2

Satellite Communication

  • Satellite Service: Two-way, Inmarsat
  • Coverage: Global
  • From-Mobile Message: 6,400 bytes
  • To-Mobile Message: 10,000 bytes
  • Typical Latency: <15 sec, 100 bytes
  • Elevation Angle: -15° to +90°
  • Frequency Rx:1525.0 to 1559.0 MHz, Tx:1626.5 to 1660.5 MHz
  • EIRP: 7.0 dBW

Cellular Communication

  • HSPA Module: GSM/GPRS/EDGE GSM 850, E-SGM 900, DCS 1800, PCS 1900 MHz
  • GPRS Module: GSM 850/900/1800/1900 MHz


  • Time to First Fix: 29 sec (Cold Start)
  • Accuracy: 2.5/2.0 m (CEP)
  • Acquisition: -148 dBm,
  • Tracking: -162 dBm


  • Operating Temperature: -40 to 85 Deg. C




SatSCADA Web Interface

Login or preview SatSCADA page and demo.

The SatSCADA Web Client application provides cost effective, easy to use monitoring to clients for standard monitoring industrial applications.

The SatSCADA Web Client provides user access via a Web Browser on Desktops, Laptops or Smartphones. more about SatSCADA Technology

Users Access Laptop and Smartphone  Well Testing Trend View

The Web Client provides Site View, Tag View, Trend and Map Views, and is auto-configured based on the SAT1xx Terminal Configurations.

SatSCADA Web Client Map View   SatSCADA Web Client Site View   SatSCADA Web Client Tag View   Alarmcallout Trend View






The SAT120’s dual mode satellite and cellular communication operation makes it suitable for mobile remote monitoring and control applications anywhere in the world.

Applications include:

Mobile Application

Well Testing
Portable Gas Compressors
Portable Generator
Frack Water Monitoring
Remote Pump Monitoring
Portable Lighting Plants
  • Portable Lighting Plants






SCADALink SAT120 Datasheet




Ordering Information



Part Number


SAT120 Basic KitSAT120-KIT1-GENDual Mode Satellite Modem for Easy Field Termination includes:  Dual Satellite / HSPA modem, GPS, 4AI/DI, 7 DI, 5 DO, 2-RS232, 1-RS485, 1-Can bus, 3-axis accelerometer, Keyed  Fakra connector for cell with cable (2m) and active satellite antenna with cable (5m), IP40, SAT-1XX-TB1 termination board with  20” cable to flying leads,-25 to 85 Deg C
 SAT120 Basic KitSAT120-KIT1-CID2 Dual Mode Satellite Modem for Easy Field Termination includes: Dual Satellite / HSPA modem, GPS, 4 I/O (AI/DI/DO), 2 DO, 2-RS232, 1-RS485, 1-Can bus, 3-axis accelerometer, Keyed Fakra connector for cell with cable (2m) and active satellite antenna with cable (5m), IP40,
SAT-1XX-TB1 termination board with 20” cable to flying leads,-25 to 85 Deg C, Class I Div 2
 SAT120 CellAntana Magmount SAT120-ANT-CEL-MAG Dual Mode Cellular Antenna Vehicle Kit 5m LMR240 Ultraflex 3dBi/4dBi 4G/3G/LTE Phantom Antenna and Mag Mount
 SAT120 CellAntana Mounting SAT120-ANT-CEL-Mount Dual Mode Cellular Antenna Kit 5m LMR240 Ultraflex Dual Band Bulkhead Lighting Arrester Unit Gain Omni Antenna and Mounting Bracket
 SAT120 CellOmni SAT120-ANT-CEL-POLE Dual Mode Cellular Antenna Kit 5m LMR240 Ultraflex Dual Band Bulkhead Lighting Arrester 3 dBi/4dBi Omni Antenna and Mounting Bracket


 SatSCADA-AIR25-S 25Kb/month satellite airtime (overrage applies), Modbus RTU Slave proxy,alarm callout SMS & email & passthru data, includes webclient access to view data
 SatSCADA-AIR25-O Overage charge per Kb after 25 Kb
 SatSCADA-AIR200 200Kb/month satellite airtime, Modbus RTU Slave proxy,alarm callout  SMS & email & passthru data, includes webclient access to view data
 SatSCADA-AIR1M 1Mb/month satellite airtime, Modbus RTU Slave proxy,alarm callout  SMS & email & passthru data, includes webclient access to view data
 SatSCADA-AIR2M 2Mb/month satellite airtime, Modbus RTU Slave proxy,alarm callout  SMS & email & passthru data, includes webclient access to view data
 SatSCADA-AIR200PLUS-OPer Kb Overage for AIR200, AIR1M, AIR2M
 SatSCADA-CELL-GATE Add Cellular Gateway (For Client outside of Canada – Client provides airtime from Local Cellular Provider)
 SatSCADA-CELL-ADD Add 300 MB/mo. Cellular airtime (Canada only) with Static IP and Cell Gateway to any satellite airtime plan
 SAT120-V-CO Voice Callout service (24/7) monthly fee (billed annually)
 (Other) Custom airtime available (contact Bentek Systems Ltd)


 SAT120-T-A SAT120 terminal satellite & cellular activiation
 SAT120-V-A Voice Callout  service activation
 SAT120-CON-IO Configure and test SAT120 for internal I/O
 SAT120-CON-MB1 Configure and test SAT120 for Modbus device ( <10 tags)
 SAT120-CON-MB2 Configure and test SAT120 for Modbus device ( 10+ tags)
 (Configuration Rate) Additional configuration services (hourly rate)
 (Other Services) Custom services available (contact Bentek Systems Ltd)
 Smartphone Access Tag View Web/Smartphone Client Smartphone and Browser-based client shows tag, map, alarm and trend views. Comes bundled with hosting plan.
 SatSCADA_GUI GUI Windows-based GUI for easy local or remote configuration of SAT120. Comes bundled with hosting plan.
 SatSCADA Client -Modbus Proxy Easy Customer SCADA Host interface to SatSCADA Client enables easy secure interface to SAT120 terminals via Modbus over TCP.  Comes bundled with hosting plan.



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