USB digital IO interface with software event notification wh

[Steve Parus]

Looking for a USB interface device with several digital input/output
lines. Desire something that automatically notifies software (Delphi)
by firing an event whenever an input line changes state. I prefer not
to have to continuously poll the device's input lines to determine
when this occurs.

Ideally the device would not require software drivers to be installed.
Or if it does, then they use ActiveX and not a dll.

Steve

 

[Rene Tschaggelar]

Steve Parus wrote:

Looking for a USB interface device with several digital input/output
lines. Desire something that automatically notifies software (Delphi)
by firing an event whenever an input line changes state. I prefer not
to have to continuously poll the device's input lines to determine
when this occurs.

Ideally the device would not require software drivers to be installed.
Or if it does, then they use ActiveX and not a dll.

Perhaps an FT232 or an FT245 from FTDI ?
On the delphi side, they work like a serial ports.
Polling the IO can be done with a controller with
sufficient pins. It'd send a serial message to the PC.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

 

[Steve Parus]

Does your component itself continuously poll in a loop to detect input
line changes ?

If so, is this how all such drivers must function in order to fire an
event upon input line changes ? I'm aware for example of devices with
ActiveX drivers that do event change notification :
http://www.phidgetsusa.com/viewproduct.asp?SKU=1221
http://www.phidgetsusa.com/viewproduct.asp?SKU=1013

On 4 Oct 2004 22:11:28 -0700, robert_marquardt@gmx.de (Robert
Marquardt) wrote:

Probably the IOWarrior from Code Mercenaries (http://www.codemercs.com)
is the device you seek. My free HID component is part of the SDK.
It reads the device in a thread and fires an event is an input line
changes.

 

[Guy Macon]

Robert Marquardt <robert_marquardt@gmx.de> says...

Please contact me directly. I check this newsgroup only through
Google.

Why you shouldn't ask for E-mail responses on Usenet:
http://www.cs.tut.fi/~jkorpela/usenet/mail-responses.html