HyQuest Solutions Pty Ltd
Point Velocity Display - Model PVD100
©
Copyright
36
Issue 1.00 4 Apr, 2007
The following information details some specifics about each format, specifically the
limitations and alternate characters that may be presented.
1)
The maximum time that can be displayed, during the measurement, is ‘FFFF
16
’. If the
measurement continues beyond the maximum data form available, the count ‘rolls
over’ and begins from ‘0’. When this occurs, the delimiter character ‘,’ is replaced by
the ‘>’ character to indicate the rollover condition. When the data is transferred to a
spreadsheet, the character, ‘>’, can be easily detected and used to add ‘65535’ (=
FFFF
16
) to the elapse time tally. No further change in the delimiter character occurs if
the accumulating time continues to further rollover.
2)
The maximum time that can be displayed as given by the final data string is 436.4
seconds as displayed (FFFF
16
x 0.00666 seconds). This equates to 7 minutes and 16.4
seconds. If the accumulating time continues during the measurement (as discussed
above), the final count tally will reflect a calculated value rolled over and beginning
from ‘0’. If this occurs, the delimiter character ‘,’ is replaced by the ‘>’ character to
indicate a rollover. To determine the total accumulated time from the roll over
condition, simply add 436.4 seconds to the total number displayed.
3)
The maximum number of measured meter contact closures (clicks) is 999. If the
accumulating contact closures continues beyond the maximum data form, the count
‘rolls over’ and the most significant digit position number is replaced by the colon
(‘:’) character. If the count continues, other characters will replace the most
significant digit position number. Meter counts should not exceed 999, however a
detection scheme is provided if such an occurrence happens.
The “Spin Test” has three subcommands as follows:
S – Start spin measurement.
A – Stop spin measurement, transmit final results, then quit.
I – Abort or quit the “Spin Test” function. No final data is transmitted.
The “Spin Test” is performed in the following manner (through the serial interface) :
1. Before entering the “Spin Test” function, select the type of meter, i.e. Cat
Whisker Head, or Magnetic Head Meter. Also enable or disable the buzzer.
2.
Press
“
N
” on the computer keyboard to enter the “Spin Test”. The
COUNT
LED will become illuminated. The
OPERATING STATUS
indicator will
illuminate
green
if the meter is selected for a Magnetic Head and
red
if Cat
Whisker Head is selected. The
PVD100
echoes with ‘
N
’.
3. Depress the letter “
S
” on the computer keyboard or press the SELECT button on
the
PVD100
. The
OPERATING STATUS
indicator will turn off.
4. When the meter is spun, the
OPERATING STATUS
indicator will blink when
a contact closure is detected.
5.
The
PVD100
will output through the serial port a character string (as described
