USBTMC Data Acquisition Device Firmware

Hello

I'm trying to develop a simple data acquisition equipment which can interface with Labview using USBTMC Protocol.  The rest of the sheet USBTMC and USBTMC-USB488, I have implemented the code to treat endpoints in bulk-Out with all the message ID. However, I am a little confused on how NI-VISA actually interracts with a device.  When a command viWrite or viRead is given, what are the specific messages are sent to the device on which endpoints, and what is the expected response of the device? What would the classic process to acquire large quanties of data from a USBTMC device? If you can clear all this for me, it would be greatly appreciated!

Thank you

Mike

When the host issues viWrite call, the header USBTMC_BULKOUT of 12 bytes followed by your channel SCPI is sent to the endpoint of your firmware BULKOUT. In this case, USBTMC_BULKOUT header contains MsgID = 1.

When the host issues appeal of viRead, USBTMC_BULKOUT of 12-byte header must be sent to ask for playback to the BULKOUT endpoint. In this case the MsgID = 2 and the length is only 12 bytes of all. Then your firmware, if a response string is ready, must set the header USBTMC_BULKIN followed by the answer of the SCPI endpoint to send BOULKIN.

viWrite generates a transaction BULKOUT and viRead generates a transaction BULKOUT more BOULKIN transaction.

example:

viWrite ("* IDN?") \n') - generates a transaction bulkout in the form of bytes [12 + 6 + 2]. (the last 2 bytes are padding to align the 4 bytes)

Correcponding viRead () - generates a bulkout in the form of bytes [12], then the firmware fixed Boulkin data [12 + response + padding].

Makoto

Tags: NI Hardware

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