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Input and Output Monitoring Specifications

The Messenger monitors remote conditions using digital and analog inputs and outputs.

All values read can be automatically converted into engineering units, compared to user-specified limits and the web-based back-end alerted immediately upon a limit violation. Remote devices can be controlled via the back-end or via SMS commands.

Conditions Monitored
General input conditions
  • 1 to 3 general purpose or pulse closure-to-ground inputs
  • Analog input 0-10V (0-20ma or resistive optional)
  • 1 output (closure-to-ground)
  • GPS coordinates for location (can be removed if not required for the application)
Reporting values to the web-based back-end
  • Current state of the digital inputs
  • Count of the digital inputs
  • Total time the digital inputs are in a particular state
  • Raw analog value or scaled into engineering units
  • Max, Min of the analog input over the day
  • Amount of time in a range, up to 4 ranges can be specified for the analog input
  • Number of times moving into a range
  • 2 high and 2 low limits specified for the analog input
  • Report immediately when any limit has been violated for the analog or digital inputs
Serial ports
  • RS232/RS485 for debug or configuration
  • External CDMA or Satellite modems
  • Support OEM-specific communication
Battery backed
  • Real-Time Clock
  • Programming
  • Event log
Communication methods to web-based back-end
  • Wi-Fi
  • CDMA
  • Satellite
  • Serial
  • FCC, PTCRB and ATT approvals for GSM/GPRS end-user applications
  • Operating vibration: exceeds SAE J1455 vibration levels
  • Operating shock: exceeds SAE J1455 shock levels
  • Enclosure: exceeds IP65/NEMA 4X
  • RoHS compliant
Power management
  • Extreme low power mode for battery-powered applications
  • Automatic switch out of low power on: movement, engine on, time
Memory management
  • 512k FLASH for application, loadable OTA or via serial connection
  • 512k low-low power SRAM, battery backed
DIP switches
  • Serial port function - Debug, Other
  • Serial port interface - RS232 or RS485
  • Baud rate
Event logger
  • Last 500 significant events
  • Accessible over-the-air
  • Accessible locally via serial port
  • Battery backed
  • Power modes - off, low, full
  • Cellular/Wireless status and signal strength
  • GPS status
  • CAN status
  • Serial port status
  • OEM specific
General purpose inputs
  • Up to 3 digital (closure to ground) inputs
  • Analog input - voltage, ma or resistive
  • Digital output (closure to ground)
SMS capabiltiy
  • Receive commands for changing configuration
  • Receive commands for over-the-air direct communications with internal menuing system
  • On-demand reporting of values
  • OEM specific
Physical Characteristics
  • 3.25" x 3.95"
  • Operating power: 8-32VDC
  • Sleep mode - less than 6 ma @ 12VDC
  • Monitoring mode - 110ma @ 12VDC
  • GPRS transmit mode - 600ma peak @ 12VDC
  • Industrial temperature range -40 to +85C
  • Watertight industrial enclosure