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
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 parameters locally or remotely.
- Enable the SIM card and configure the APN of your telephone network
- Establish a connection between the GRD-MQ and the broker
- Configure the inputs/outputs in the GRD according to their use:
- Physical inputs/outputs
- External Modbus inputs/outputs.
- Configure the GRD-MQ serial port.
- Configure the “Embedded Modbus master" and the queries we want it to make.
- Configure the topics and formats to publish an enable reports and historicals to publish
Remote serial port
This procedure will allow you to send and receive data to and from the serial port (RS232/RS485) using publish and subscribe.
For this type of solution the following procedure must be followed:
- Install the GRD.
- Install the configuration software (“GRD Config”) V9.1+, this application will allow us to configure all GRD parameters locally or remotely.
- Enable the SIM card and configure the APN of your telephone network
- Establish a connection between the GRD-MQ and the broker
- Configure the serial port in Remote mode
- Configure the serial ports publish and subscribe topics
SMS alarms / control
The GRD-MQ can send SMS alarms to up to 8 recipients based on the value of its inputs.
You can also send and SMS to the GRD-MQ to ask for the value of a particular input/output or to activate an output.
This inputs/outputs can be physical or Modbus signals.
The SMS feature can be used together with GPRS solutions.
Script programming can also be used for customized solutions where the standard criteria to send SMS alarms is not enough.
For this type of solution the procedure below must be followed:
- Install the GRD-MQ
- Install the configuration software via USB (“GRD Config”), this application will allow us to configure all GRD-MQ parameters locally or remotely.
- Enable the SIM card
- Configure the inputs/outputs in the GRD-MQ according to their utilization:
- Physical Inputs/Outputs
- External Modbus Inputs/Outputs.
- Configure the GRD-MQ serial port.
- Configure the “Embedded Modbus master" and the desired queries.
- Configure the possible recipients
- Configure the possible conditions to send an SMS alarm and the text that will be sent
2022-03-17
