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vrf AW: Two Questions, Need answers

Question asked by VRFuser on Jan 19, 2003
Hello Gregg,

We tested the Agilent 82537A USB to GPIB Adapter with VEE 6.03 on a notebook
running XP. Simple plug and play installation, works great. New computers -
including workstations - in our departement will be equipped with thes
instead of PCI GPIB cards, because it offers more flexibility and reduces
cabling costs (USB cables are much cheaper than GPIB cables).

Regards,

Rolf Eichenseher

-----Ursprngliche Nachricht-----
Von: Kevin Valentine [mailto:kevin@physchem.ox.ac.uk]
Gesendet: Montag, 20. Januar 2003 09:14
An: VEE vrf
Betreff: [vrf] Re: Two Questions, Need answers


Question 2
Has anyone succeeded in using the USB port of their computer for
general purpose I/O, under VEE?  I know about the GPIB to USB
translator that the company now sells, but I am curious about that
idea instead.
-------------------
Gregg C Levine hansolofalcon@worldnet.att.net
------------------------------------------------------------
"The Force will be with you...Always." Obi-Wan Kenobi
"Use the Force, Luke." Obi-Wan Kenobi
(This company dedicates this E-Mail to General Obi-Wan Kenobi )
(This company dedicates this E-Mail to Master Yoda )


If you are going to talk to something which you are going to build then a
good device to use is the USB interface IC's made by FTDI (
http://www.ftdichip.com/ ).  These can be bought as either stand alone ICs
or a module with a USB port on it.  They have to be connected to a
microprocessor or microcontroller.  When you install the driver on the PC it
appears as a serial port and can be talked to using the IO manager in VEE.
The speed is not restricted to serial speed and if you use the USB245 the
theoretical transfer speed is 1MByte/sec.

As for using USB to talk to other devices using VEE, I did a bit of research
a few months ago and drew a blank.  It appeared that the main stumbling
block was Windows blocking access to the USB port which gets worse if you
are using NT/2000/XP.  To talk to the USB port it seems you have to write
your own drivers which I did not want to get involved with.

Kevin Valentine



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