VISA Read Timeout and VISA Write not working

I'm writing a program that sets a triangle wave pattern voltage (using Triangle Wave VI) to a DC power source (GWInstek PST-3202) through a RS-232 connection. I know my instrument parameters are set up correctly because I've been able to control this power source using a different VI with the same parameters. I also know I am connected to the power source because I can talk to it using MAX. I have a string indicator before my VISA Write statement that shows me the command being sent to VISA Write. It shows the correct syntax for setting a voltage on this instrument. However, when I run the VI, the voltage is not changed on my instrument, even though the correct command is sent to the instrument. After the VISA Write operation I have inserted a VISA Read function in order to read the newly set voltage from both a numeric and a waveform indicator. Using the Error Out cluster I am able to see that there is a timeout error from VISA Read. I thought perhaps I needed to clear or flush the buffer after each Read statement, but that didn't work either. I'm stumped as to why VISA Write isn't writing to the device. I have included my VI below, as well as the initialization subVI for the power supply.
Attachments:
Triangle Volt Mod.vi ‏27 KB
GW Instek initialization.vi ‏18 KB

Yep, you need to append the End of Line character to the end of your command. And for your read to work properly, you need to request the data. That requires a querry command to be sent. Look closely at the differences in command and communication structures between your working VI and your mod.
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Hi all,
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I am trying to write to and read from a programmable power supply via RS232. The VI writes a command to the instrument to set the voltage level. It then writes another command, requesting the resulting current value. This value is then read by VISA read
The VI is working fine on the development PC, which has LabVIEW installed. The exe file is also working fine on this PC. However, when I try to run the exe file on another PC (I've tried several) everything seem to work except for the VISA read functions. The voltage level command is sent, as well as the On and OFF commands, but the current is not read back.
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Clara

Clara-
1. Have you verified that the COM port settings in Windows (check under device manager) are matching how you initialize them (Baud, bits, parity, and flow control) and that these match the power supply's settings?
2. Also, are you trapping an error message after the attempted Read command (this will make it a lot easier to diagnose).
3. Do you programmatically close the VISA session at the end of the program?
4. You can always post the code to see if the forum members will catch the porblem.
~js
2006 Ultimate LabVIEW G-eek.

How to run vi continuously when VISA read timeout happens

Hello,
I am using LabView 2010 to read an Agilent 6000 series Oscilloscope. The Oscilloscope reads data from another experimental machine which fails occasionally due to sample failure. When the machine fails, it stops sending signal to the oscilloscope and leads to the VISA read timeout error and the whole vi is terminated. Is there a way that I can continuously run the vi when the error happens? For example, when the error happens, it stores the error in the error wire. When the vi read the error code from the wire, it sends a command to stop my experimental machine then stop the vi.
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Solved!
Go to Solution.

I'll start of with automatic error handling. By default, LabVIEW enables the automatic error handling. So consider the case like the one below,
If let's say the VISA Read returns an error, but you did you pass the error information to VISA Close, what will happen is that LabVIEW will highlight the VISA Read (since the error comes from that function), pause the execution at the VISA Read and an error dialog box will appear. From the dialog box, it will prompt to either continue (Move on to the VISA Close) or stop (LabVIEW will stop the VI at VISA Read)
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http://www.ni.com/gettingstarted/labviewbasics/handlingerrors.htm
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http://zone.ni.com/reference/en-XX/help/371361K-01/lvinstio/visa_close/
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Hello I am just starting to use the VISA read and write function in labVIEW
anybody knows what are the differene between VISA Read buffer and string? and comparison of VISA Write buffer and string
thanks
Solved!
Go to Solution.

Hi Ein,
"read buffer" is the label of the string given by VISARead, "write buffer" is the label of the string expected by VISAWrite!
So there is no difference...
Best regards,
GerdW
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