Microtel MicroWin 2000 - Manual (Page 91)

MicroWIN 2000 Manual
Version 1.0
There are five scaling options: Percentage, 4 to 20mA, RTD Fahrenheit, RTD Celsius, and
Scaled. The first four (Percentage, 4 to 20mA, RTD Fahrenheit, RTD Celsius) are predefined
ways to scale the channel value.
Percentage is used to report how the channel value is actually being read on the dialer. Since
percentage (0% to 100%) is the way that the dialer stores its analog channel values, no
conversion of the data will take place before being displayed.
4 to 20mA is a simple conversion of the dialer’s 0% - 100% range to 4 - 20mA range. For
example, 0% = 4mA, 25% = 8mA, 50% = 12mA, 75% = 16mA, and 100% = 20mA. This is a
linear transformation from the 0% - 100% scale to 4 - 20mA scale.
RTD Fahrenheit and RTD Celsius are a little different. These two types are used with a special
RTD Input module (connects to a 100 ohm platinum probe) that is available for the dialer. It can
be used to monitor oil temperatures, barring temperatures, etc. The temperature range is -50
° F to
350
° F. For more information, contact Microtel.
The readings from an RTD Input are not linear. These two types have been supplied to provide
an easy way to get an accurate scale transformation since they are not linear.
Scaled is used when something other than the predefined options is needed. For example, the
0% to 100% reading that is read for a dialer channel can easily be scaled to 0 to 200 Ft, 30 to
90RPMs, -60 Centimeters to 30 Centimeters, or whatever the high and low values are for the
current application.
This Scaled value is a simple linear conversion of the dialer’s 0% - 100% range to user defined
scale. For example, if the scaled range is from 200 Fathoms (0%) to 240 Fathoms (100%),
some sample transformations from the actual value to the scaled value are 0% = 200 Fathoms,
25% = 210 Fathoms, 50% = 220 Fathoms, 75% = 230 Fathoms, and 100% = 240 Fathoms.
Report Status Flag During Callout
When a dialer is called or makes a callout to report an alarm, an initial status message is spoken
to report the current status conditions on the dialer (which channels are in alarm, acknowledged,
and now normal). When the Report Status Flag is set for a channel, the initial status message
that is reported will now contain a message that specifies this channel’s actual state value.
This is useful for quickly getting a particular channel’s reading without having to type in any
extra command codes.
Report Settings
When a channel reports its status condition to a person using a phone, each marked value will be
spoken for this channel.
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