Introduction to the GRD-MQ
Purpose of this manual
The purpose of this manual is to provide the instructions to quickly and easily install and operate the
GRD-MQ equipment (3G models)
The installation of the GRD-MQ also implies the installation of middleware and eventually any other
application depending on the intended use for the system.
Telemetry solutions GPRS with GRD-MQ
The GRD-MQ has multiple uses. These are the most common uses that will guide you to read this
manual.
GPRS RTU/Datalogger to MQTT broker
Physical inputs/outputs
Modbus inputs/outputs (embedded Modbus master)
Serial port data (using script programming)
Local input/output control (using script programming)
Publish current values (reports) and timestamped values (historics) using MQTT
Receive commands/order from the MQTT broker using subscription
GPRS RTU accessible by Modbus
Physical inputs/outputs
Serial port data (using script programming)
Modbus protocol to read input/outputs remotely
Remote Access to serial port
Remote serial port via MQTT broker
SMS alarms/control
Physical inputs/outputs
Modbus inputs/outputs (embedded Modbus master)
Serial port data (using script programming)
Local input/output control (using script programming)
GPRS RTU/Datalogger to MQTT broker
There are hundreds of types of sensors that can be contacted directly to the GRD-MQ inputs to measure
different types of variables. Depending on the GRD-MQ model, sensors could be used to deliver signals
in 0-10V, 4-20mA or pulses, or simply connect different devices to their inputs/outputs. The GRD-MQ can
also be configured as Modbus master and queries can be made to different slaves to expand its
inputs/outputs.
The GRD works as a datalogger, creating records with timestamp with the value of the built-in or external
I/Os and publish them to the broker
The GRD can also be used to do a local control over its inputs/outputs using the script programming
feature.
Nota:
Exemys does not provide the
MQTT broker
For this type of solution the following procedure must be followed:
Have an MQTT broker available
Install the GRD.
Install the configuration software (“GRD Config”), this application will allow us to configure all GRD
GRD-MQ User Manual
Introduction
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