Tunnel – Periodic monitoring by 2G/3G/4G of 0-10V sensor. Activating the sensor supply through a digital output connected to an external relay. Send to web server through HTTP

Scenario details:

• We want to monitor a 0-10V sensor with a 2G/3G/4G modem
• The modem and the sensor will be powered by solar panels, so the 0-10V sensor that will be connected to the modem should only be activated 5 seconds before the measurement (to activate an external relay that supplies the sensor and this is stabilized) and after reading, the digital output must be deactivated in order to turn off the sensor and save energy consumption
• Every 6h (at 00:00, 06:00, 12:00 and 18:00) the MTX modem must activate the digital output (which will activate an external relay) to feed the 0-10V sensor to be measured, wait 5 seconds to stabilize the signal of the sensor, and then proceed to read it. Once the sensor is read, the data will be stored in the modem flash memory (datalogger) and sent to a web server via HTTP GET as soon as there is 2G/3G/4G coverage
• After the 0-10V sensor reading process, the modem must deactivate its digital output (and therefore the external relay) to remove power to the 0-10V sensor and save consumption

Solution: MTX-Tunnel firmware + MTX-Java-IoT

EXAMPLE of settings (file config.txt) for such scenario:

Details:

• The frame sent to the server has the following JSON format:
  24/06/2019 19:00:26 — {“IMEI”:354033090132906,”TS”:”24/06/19 17:00:15”,”TYPE”:”IO S”,”P”:”12345678”,”IO1”:0,”IO2”:0,”IO3”:0,“IO4”:1,”IO5”:1,”IO6”:0,”IO7”:0,”IO8”:0,”IO9”:0, ”IO10”:0,”AD1”:469,“AD2”:1469,”CO1”:”0”,”CO2”:”0”,”CO3”:”0”}

Where:

• This example uses the files “iologger_start.txt” and “iologger_end.txt”. These text files allow you to enter commands that will be executed automatically BEFORE the reading process of the modem I/O data and AFTER the reading. Both files must be placed in the/atscripts folder.
  The content of “iologger_start.txt” for this example is as follows:
  EXECUTE AT^MTXTUNNEL=SETIO,3,1
  PAUSE 5
  Basically, it executes an AT command that activates a digital output of the modem and waits 5 seconds.
  The content of “iologger_end.txt” for this example is the following:
  EXECUTE AT^MTXTUNNEL=SETIO,3,0
  Where the digital output is simply disabled after reading the sensor.
• This example uses the file “schedule.txt”, whose documentation you will find in this manual, which allows you to enter the execution times of certain AT commands. The contents of the “schedule.txt” file for this application is as follows:
  1:-1;0;0;AT^MTXTUNNEL=IOEVENT
  2:-1;6;0;AT^MTXTUNNEL=IOEVENT
  3:-1;12;0;AT^MTXTUNNEL=IOEVENT
  4:-1;18;0;AT^MTXTUNNEL=IOEVENT
  In this file 4 schedules are entered. Every day of the week, at 00:00, 06:00, 12:00 and 18:00, the command AT ^ MTXTUNNEL = IOEVENT will be executed. Said AT command will launch the process of reading the modem I/O, storage in the modem datalogger and sending it to the web server.