Re: Sending data direct to USB in OSX
Re: Sending data direct to USB in OSX
- Subject: Re: Sending data direct to USB in OSX
- From: Graff <email@hidden>
- Date: Sun, 14 Mar 2004 17:58:00 -0500
On Mar 14, 2004, at 5:22 PM, Doug McNutt wrote:
At 18:55 -0800 3/14/04, Rod McDevitt wrote:
I used to use a mini-application specially written to send a cash
drawer trigger (usually control-g) to the serial port on my Mac using
OS9 - now with OSX and USB and a USB receipt printer, I need to do
the same.
Delcom Engineering
http://www.delcom-eng.com
I'm working with a fellow who wants to use the USB for scientific
instrumentation. He brought over a chip on a prototype printed circuit
board and a couple of drivers that came with it.
The drivers install in the /dev/ directory and it all worked right out
of the box.
It was as simple as using Terminal to "cat" a short text file to the
device. All of the USB headache was handled by the driver. 8 bit
parallel bytes were easily seen using an oscilloscope to look at 5
volt test points on the PCB.
cat textfile > /dev/DelcomDriver
Isn't the /dev directory the attachment point for the device in
question, not the drivers per se? It sounds like the driver did the
right thing and properly translated the text you sent to it. I'm not
sure if I'd trust this method without prior knowledge as to if the
device driver handles input in this manner. For example, if there was
a USB drive at the other end of that USB cable what would sending raw
text do? Create a file and start filling it with the data? Start
overwriting the disk headers with the text? You don't really know if
you haven't read the documentation and thus you could cause big
trouble.
-Ken
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