Set VISA read sync globally

Hi,
From an LabVIEW application that I am working on, I need to set the Visa Read to be syncrhonized. From the context help file, I learned that I can right click on the Visa Read VI icon and set the attribute. But, I want to ask if there any way to do it globally so that every VISA Read is behaving this way?
I am using LabView 8.5
Thanks.
Peggy

Hello PeggyC
Once you have placed the vi on the block diagram and right click on it select the Synchronous I/O mode to the one you want and then select the vi and copy and paste it wherever you want it and it will have the same properties for this mode. I am not really sure you can do it programatically to all of the VISA read vi's that you have on your application.
"everything is achieveable through technology'

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please try the attached vi (not testet cause i don't have any serial device at hand).
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Attachments:
event_ValSignaling_7.1.vi ‏53 KB

Visa read object difference parity setting for PC and TPC2012 device

Hello,
we found some difference between application running in PC and runing in TPC2012 device.
We tested modbus communication via RS485 (9600b/s, 8bits, parity even) between PLC(master) and TPC2012 (slave). We used Visa read object and set parity to Even via property node. From the PLC we sent request to device and in our application we only read the data from PLC and displayed it (8bytes) on sreen.
If we tested the application on PC everything worked fine. But if we compiled application and ran it in TPC2012 device the data was different (for example if I sent request from PLC to slave 05 03 00 01 00 01 crc crc on the TCP I saw 00 03 00 01 00 01 crc crc. The crc on TPC wasn't equal to crc on PLC.
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I just found out that the VI for the currentmeasurement with the keithley 6517a has the same error but still works fine. Now I also tried to adjust the serial data bit and parity settings via the VISA configure serial port function but still no improvements.

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I am using VISA Reads with TCPIP raw sockets without issue with NI-VISA 3.0.1 but when I moved to NI-VISA 4.4 I was getting timeout errors. The timeout errors went away when I set the termination character enable property to true (which seemed to be default in NI-VISA 3.0.1), but now I get a warning stating that the "termination character was read".
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Sorry for the wordiness of my question. If anyone would like some screen shots of portions of my code (I can't submit the actual code because some of it is confidential) I'd be happy to post them.
Doug.

Hi Doug,
The first thing I would recommend is the solution you have already found, to check and see if there is data at the port before attempting a read. I would be interested to see if this will solve the problem. Does there seem to be any trend to which ports have this timeout error? How many ports does it cut down to before operation seems to continue as expected? Does this number vary, or is it always the same number of ports? I think the best thing to do will be to identify constant attributes of how the error is occurring so that we can narrow it down and see what is going on.
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I am having problems with VISA read in an exe file created.
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Set VISA read sync globally

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