Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Wed, 27 Feb 2008 13:21:50 -0600

There are also very inexpensive USB devices:
http://www.l-trondirect.com/usb-4751l.html
USB-4751L
USB-4751L is a 24-bit digital I/O module for the USB bus. Its 24 bits
are divided into 6/3 8-bit I/O ports and users can configure each port
as input or output via software. USB-4751L also provides one event
counter and three 16-bit timers, which can be cascaded to become a
32-bit timer. 

Compatible with USB 1.1/2.0 
Portable 
Bus-powered 
24 TTL digital I/O lines 
Emulates mode 0 of 8255 PPI 
Buffered circuits for higher driving capacity than 8255 
Interrupt handling 
Timer/Counter interrupt capability 
Supports both dry and wet contact 
50-pin Opto-22 compatible box header 
Suitable for DIN-rail mounting 
Lockable USB cable for rigid connection  

A soft IOC using libusb on Linux should be pretty easy.

Mark

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of David Dudley
> Sent: Sunday, February 24, 2008 8:10 PM
> To: [email protected]
> Subject: Re: TTL output with soft IOC on Linux
> 
> Might also look into some of the cards from Measurement 
> Computing.  I'm
> using a 96 bit card from them that one of my coworkers spent 
> about a day
> and wrote a basic driver for.  Seems pretty simple, and there 
> are cards
> with 24,48,and 96 bits of input and output.  Plugs directly into SSR
> relay racks, also.
> 
> David Dudley
> City of Corpus Christi
> 
> >>> Robert Horrox <[email protected]> 2/22/2008 6:04 PM >>>
> Jiro,
> 
> You may want to look into the Acromag ES2113 discrete I/O device.  It 
> supports ModTCP and I have been able to get it working with the Modbus
> 
> driver written by Mark Rivers for Asyn.  You would need to provide 5v
> pull 
> ups for the ES2113 and I'm unsure of your timing constraints 
> so I can't
> 
> be sure if it would work for you.
> 
> I do have some performance specs that I made when I was working 
> with the ES2113 this summer if you are interested.
> 
> Have a good day!
> 
> ----------------------------------------------------------------
> Robert Horrox(KE7JAX)
> Electrical Engineering Undergrad ([email protected])
> President Amateur Radio Club at the University of Washington
> 
> 
> On Wed, 20 Feb 2008, Jiro Fujita wrote:
> 
> > Has anybody worked with a simple TTL devices (on and off only) with
> > soft IOC running on Linux??
> > We have a number of FEE for one of the sub-systems for STAR detector
> > at Brookhaven National Lab that we currently control via  EPICS 3.12
> > with VME that we would like to move to soft IOC on Linux if all
> > possible.
> > I appreciate any informations/suggestions on this.
> >
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System