Tunnel – Regular reading of 3 Modbus temperature sensors and then sending to a webserver(Model MTX-Temp-RS485-IP65 of MTX accesories)

Scenario details:

• We have 3 temperature sensors MTX-Temp-RS485-IP65, which can be found in the MTX accessories catalogue of Matrix Electronica
• The MTX-Tunnel must periodically poll, every 10 minutes, the three temperature sensors, which use ModBus protocol. The modbus temperature record is 1. The ModBus addresses for the sensors have been previously set as 1, 2 and 3
• The MTX-Tunnel must send, after every reading, the value of the records to a web server via HTTP GET using a JSON object, but must be able, in case of 2G/3G/4G communication failure, to store up to 100 records in its flash memory, which will be sent when communications are restored. For each meter it will send a trauma JSON, where the meter that is read is specified by an identifier (the modbus address)

Solution: MTX-Tunnel firmware + MTX-Java-IoT/MTX-Java-T/MTX-Java-T2

Settings (file config.txt) for such scenario:

Details:

• The JSON object format that the MTX-Tunnel will send to the web server, will be similar to the following string, for sensor 1 (23.0º):

{“IMEI”:353234028103206,”P”:”ID00001”,”A”:1,”TS”:”20/04/13 08:31:44”,”ST”:1, “V1”:230} ;

• For sensor 2 (24.5º):

{“IMEI”:353234028103206,”P”:”ID00001”,”A”:2,”TS”:”20/04/13 08:31:44”,”ST”:1, “V1”:245};

• And for sensor 3 (22.1º):

{“IMEI”:353234028103206,”P”:”ID00001”,”A”:2,”TS”:”20/04/13 08:31:44”,”ST”:1, “V1”:221}

• At the end of the manual you will find how to configure the internal microswitch to activate the RS485 bus of this modem model