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RS485 half duplex
Serial communications implemented with two wires, allowing data transmission
in both directions, but not simultaneously.
RS485 full duplex
Serial communications implemented with four wires, allowing data transmission
in two directions simultaneously.
Run Mode
The normal operating mode of the meter, where readings are taken, as
opposed to the
menu mode
.
Scale factor
A constant multiplier used to go from a raw reading in pulses per second or
total pulses to a reading in engineering units. The scale factor consists of a
scale value from 0.00000 to 9.99999 (fixed decimal point, settable digits) and a
scale multiplier from 0.00001 to 100000 (in decade steps).
Scaling
The process of setting
scale
and
offset
so that the meter reads properly in
engineering units (such as gallons/minute).
Scaling, coordinates of 2 points method
A scaling method where four numbers are entered manually: low input, desired
reading at low input; high input, and desired reading at high input. The meter
then applies a straight line fit.
Scaling, scale and offset method
A scaling method where
scale
and
offset
are entered manually.
Setpoint
A value compared to the reading to determine the state of a relay. Term often
used interchangeably with “alarm setpoint.”
Stopwatch mode
A timing operating mode for single events. Stopwatch A-to-A measures time
between the same positive (or negative) edge of start and stop pulses applied
to Channel A. Stopwatch A-to-B measures time between a start pulse on
Channel A and a stop pulse on Channel B.
Time interval mode
Returns the average duration of repetitive events over a programmed gate
time. Time may be measured from the leading or trailing edge of pulses applied
to Channel A to the leading or trailing edge of pulses applied to Channel B.
Time-out (or time before zero output)
The time the meter waits for a signal to start or end a conversion. If pulses are
not received before the time-out ends, the meter reads zero. The longer the
time-out, the lower the minimum frequency the meter can display. This term is
also used for the programmable time that the batch relay stays de-energized at
the end of a batch cycle.
Summary of Contents for 800 plus
Page 63: ...63 SERIAL CONNECTION EXAMPLES ...
