VISA read in exe file is not working

Hi all,
I am having problems with VISA read in an exe file created.
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.
I guess there must be something I have missed in the installation. I am working in LabVIEW 8.5. I have created an installer and included
Runtime Engine 8.5.1
VISA runtime 4.5
Is there something else I should do? I am really running out of ideas here...
I hope someone has a clue about this!
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.

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