HyQuest Solutions Pty Ltd
Point Velocity Display - Model PVD100
©
Copyright
23
Issue 1.00 4 Apr, 2007
T
–
Terminate the measurement:
PVD100
stops the measurement at the next contact
closure and, at the next contact closure (which is counted), sends the last tally of
accumulated counts and elapsed time as previously described.
I
–
Abort the measurement:
The
PVD100
aborts the measurement. No final
measurement data is transmitted.
P
–
Start a measurement without doing a calibration:
This command is used to begin
a measurement without performing a calibration. The command should only be
used for a high velocity measurement that does not allow a calibration to be
performed due to the rapid rotation of the meter cups.
Q
–
Continuous measurement:
This command is used to continuously output a 1-
second data display without a time limit. The
‘T’
or
‘I’
command must be used to
terminate the operation.
V
– The software version of the
PVD100
is sent in the following manner:
vX.X
Example:
v1.0
4.4.1 Data Conversion Example
The data format of the
PVD100
is transmitted in HEX ASCII (base 16 numbers using the
ASCII code which is displayable on any terminal) to provide efficiency in the number of data
characters sent through the serial interface. Following is an example of the interpretation of
the data. The example is given with the
PVD100
in NORMAL Speed mode.
Example:
d0C,0AF6
Accumulated meter counts =
0C
16
=
12
10
Elapsed time =
0AF6
16
=
2806
10
= (2806 counts x 0.003333 sec/count) = 9.35 secs
The data format says a total of 12 meter counts have been accumulated in 9.35
seconds.
Shown below is a simple
Excel
program that easily converts hexadecimal numbers to decimal
(base 10) numbers. The column ‘Decimal Conversion’ shows the
Excel
formula.
Hexadecimal
Decimal
Number Conversion
1F =hex2dec(A3)
0
1
2
3
A B
