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.
> >
>
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