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515 FA01 - 29 August 2021
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Appendix A
Glossary
Glossary
500-PM
Software
The 500 Series Program Manager (500-PM software) is a Windows based
program that is freely available from the download section of the Contrec
website. The program is a comprehensive configuration tool and resource
centre that can be used to tailor an instrument to suit specific application
needs including program settings, units of measurement, custom tags/text,
access levels and more. Custom versions can be saved and configuration
reports generated as a PDF.
ASCII
American Standard Code for Information Interchange. For the ASCII
protocol, the instrument receives and transmits messages in ASCII, with all
command strings to the instrument terminated by a carriage return. Replies
from the instrument are terminated with a line-feed and a carriage-return.
K-factor
The K-factor is a constant value associated with frequency type flowmeters.
It is a scaling factor used in calculations to determine flow rate.
Linear
Correction
A scaling of the input signal to represent the actual flow parameter.
Modbus RTU
The Modbus protocol is a message structure for communications between
controllers and devices regardless of the type of network. In RTU (remote
terminal unit) mode, each 8-bit byte in a message contains two 4-bit
hexadecimal characters. This mode has greater character density than
ASCII and allows better data throughput than ASCII for the same baud rate.
Normalised
Input
A normalised input ranges from 0 to 1.000. For 4-20 mA input, the signal is
set to 0 at 4 mA and the signal is set to 1.000 at 20 mA.
NPS
Namur Proximity Switch.
Passive Output
Signal
Requires an external power supply.
Watchdog
Timer (WTD)
The WDT is used to monitor the activity of the micro processor and will
force a reboot if the micro processor stops, while power is applied, due to
any internal or external influences.
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