72-901-04 Rev A 8/12/2019
Page 3 of 24
1. Scope
This purpose of this document is to provide an introduction to the MicroVision
EX
Controller and its Modbus TCP/IP capabilities. The intent is to provide a Modbus
developer with the information needed to interface the controller with a typical
Supervisory Control and Data Acquisition (SCADA) system.
2. Introduction
MicroVision
EX
is a microprocessor based cooling tower controller designed to
monitor and control water quality parameters within the circulated tower water.
MicroVision
EX
determines the TDS present in the tower water via a measurement of
water conductivity.
Some MicroVision
EX
models can also measure and control the tower water pH and
Oxidation-Reduction Potential (ORP).
Additionally, all MicroVision
EX
models come equipped with hardware based Timers
which activate AC relays. These Timers are typically used to dose chemicals into the
tower water and are highly configurable.
Depending on the model, MicroVision
EX
is configurable using one or more of the
methods listed below:
Using buttons present on the MicroVision
EX
front panel
By importing a configuration file via the MicroVision
EX
Universal Serial Bus
(USB) interface
Using PULSAlink – A cloud based IoT application with PC and Mobile Apps
designed to provide remote status and control capabilities.
All MicroVision
EX
models equipped with an Ethernet interface can connect to a
SCADA system via the Modbus TCP Compunction protocol. MicroVision
EX
supports
simultaneous connections to both a Modbus master and the PULSAlink IoT cloud
application. MicroVision
EX
serves as a Modbus slave / client and can provide a
Modbus master / server with the controller’s current configuration settings and its
operational status parameters.
The following sections within this document provide a Modbus developer with the
MicroVision
EX
memory map and other relevant interface information.
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