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Installation, Operation and Maintenance Manual
OXYvisor Optical Oxygen Analyzer
A5 - Common Graphs
A6 - Default Conguraon Sengs
A7 - Modbus RS-485 Communicaons with OXYvisor
Phase/AMP vs O2 - BOS3, BOS2, BOS1 in gas phase and aqueous
At any point in time the analyzer may be set to its original default conguration settings. This can be done via
the sub-menu Diagnostic - Test Security / Reset to Factory Defaults. This may be requested during troubleshooting
with factory personnel to get rid of bad calibration or other undocumented changes and to start over with a
known starting point.
The OXYvisor is equipped with two-way serial communications via RS-485 Modbus. The Modbus
communications can be used to remotely read and write to the analyzer. Read registers carry the primary
and secondary PV’s, diagnostics information and alarm codes. Write registers allows for changing of key
parameters such as alarm set-points and operation of Auto-Calibration and Test Gas Insert functions. Full
conguration is still best performed via the HMI or the provided software (via Modbus 485).
Remote communications on the OXYvisor is handled by the RS485 communication module that plug directly
into the back-termination board. A PLC or a computer (with USB-RS485 converter) can be used as a Master
and the OXYvisor as a slave device. RS485 connections can be wired in a 2-wire arrangement as shown in the
schematic below. This simple protocol can be used for exchange of data between the OXYvisor (Slave) and
PLCs/Computers (Master).
When connecting to a computer, a USB-RS485 converter with a CH340 chip is recommended
over a FTDI USB-RS485 converter cables for MODBUS communication. USB-RS485-WE -
(Weblink for www.ftdichip.com)
DEFAULT CONFIGURATIONS
A7.1 -RS485 Schemac Terminaon and Wiring to OXYvisor
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