18 Jul
2002
18 Jul
'02
12:28 a.m.
At 09:31 PM 7/17/02 -0700, Eric wrote:
I wrote:
I'm pretty sure that you're correct about the name but I don't understand
how they know what device to put the "loop" into since almost any HP-HIL device
could be the last one on the chain. For example, you might have only a keyboard, or you
could have a keyboard and then a mouse or you could have a keyboard, a graphics tablet and
then a mouse or maybe just a keyboard and a tablet. The possiblities are astronomical.
IIRC you have have up to 8 devices on the HIL chain.
Oh! And just to add to the confusion, the HP IPC has TWO HP-HIL ports. The IPC keyboard
doesn't have a second port for daisy chaining to other devices so you're supposed
to plug the (HP-HIL) mouse into the second port on the IPC. I've tried standard HP-HIL
keyboards on the IPC and they work fine. I've also used the second port for a mouse
with no problems but I've never tried daisy chaining a mouse off of HP-HIL keyboard
attached to an IPC. Hmm, it might be interesting to put a keyboard and a mouse into EACH
of the ports. (yes, I have IPCs to spare!)
BTW I have two different manuals for the HP-HIL mouse and one manual for the HP-HIL
keyboard and NONE of them tells what HP-HIL stands for!
Joe
> It might use HP-HIL, Hewlett-Packard Human
Interface Loop.
Tony wrote:
Are you sure that's _loop_? HP-HIL is not
physically a loop. It's a
point-to-point serial interface.
It's my understanding that electrically it forms a loop, because the
last device loops the data back. I could be wrong -- it wouldn't be the
first time.