How to parse 16 bit signed integer

Currently, I am attempting to collect meaningful data from a flow meter
connected through serial communication (RS-232 port). The
received data is a 16 bit signed integer in two's complement
representation i.e. the 16 bit signed integer is in binary format with
2 bytes synchronization preceding.
For each value from the flow meter the byte sequence recevied is as
follows: 0x7F (sync) , 0x7F (sync) , MSB , LSB. When
parsing, I would like to ignore the buffers and store/convert the
correct values from the flow meter into decimals, but I do not know how
to do that. I attempted to use Instrument I/O Assistant and the
programming similar to it, but I don't know how to identify the buffers
as seperators.
Do any of you know how to do this? Let me know if you need more information. Your help will be most appreciated.

Well, cast the entire string as an array of U32, use "split numbers" to get the last 16 bits each, cast to I16.
(look ma, no loops! )
Message Edited by altenbach on 10-12-2005 09:57 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
cast.png ‏3 KB

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How to read 16-bit signed integer in binary format with 2 byte sync. preceding??

A flowmeter provides data as 16-bit signed integer in binary format with 2 byte sync. preceding
I got i small problem by understanding the synchronasation.
I read the data provided by the flowmeter, and then write it to a binaryfile.dat. i need to convert the data to decimal format. is it better to convert the data before or after writing it to the binary file. Coz i need to read the data out again for calculations and save it again in a new file.
I understand that the synchronization help one to see where to begin reading the usable data. is it right?
Need any suggestions
Thank you !
Zamzam
HFZ
Attachments:
DataOut.JPG ‏37 KB

HI Rolf.k.
Thank you for the small program it was helpfull.
You got right about that proberly there will be conflict with some spurios data, I can already detect that when writing the data to a spreadsheet file.
I writes the data in such a way, that in each line there will be a date, a timestamp, a tab and a timestamp at the end. That means two columns.
When i set given samplerate up, that controls the rate of the data outflow from the device, (1,56 Hz - 200 Hz), the data file that i write to , looks unorderet.
i get more than one timestamp and severel datavalues in every line and so on down the spreadsheet file.
Now the question is: Could it be that the function that writes the data to the file, can't handle the speed of the dataflow in such a way that the time stamp cant follow with the data flowspeed. so i'm trying to set the timestamp to be with fractions of the seconds by adding the unit (<digit>) in the timestamp icon but its not working. Meaby when i take the fractions off a second within the timestamp i can get every timestamp with its right data value. Am i in deeb water or what do You mean!??
AAttached Pics part of program and a logfile over data written to file
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Zamzam
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DataFlowWR.JPG ‏159 KB
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How to parse 16 bit signed integer

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