GPIB and VISA support

I need help to understand how VISA reads from GPIB. By using LabView 8.6, I'm applying to communicate with a customized by using GPIB controller. He is currently working, but I'm not sure of how to use the Enable property of termination.

I read of GPIB using VISA Read. I use 1000 for the number of bytes. VISA expiration time is set to 30 seconds. The controllers stop character is a ' > ' (ascii 62).

1 how VISA knows when to stop reading if there are less than 1000 bytes to be read, the stop character is disabled, and it is during the period? VISA stops when more no byte is coming in? It works for me with endpoints off, but with an ending to this topic is much slower and I don't understand why.

2. I also use the GPIB-RS232 converter for certain situations. The PC has the GPIB and RS232 controller. Using the converter, I need to activate the stop character so that it works correctly.

A GPIB read should end when EOI is detected. It is one of the management interface, and is a requirement for the GPIB. A stop character of > is very strange. If any type of stop character for a GPIB instrument designed over the past 20 years or more, is, to put it politely, unusual. Your calling a controller raises another question. There is usually only a single controller in a GPIB system and it would be a device as the NI PCI-GPIB or GPIB-USB-HS. You are trying to design your own controller?

RS - 232 with none of the lines of management GPIB, you need another mechanism to put an end to a reading.

Tags: NI Hardware

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