Re: [hpoj-devel] Re: ptal-printd init script for RedHat

[<pa...@rc...>]

Hi, Daniel.

Daniel Gun wrote:
> Does the device try to communicate with the computer when it is turned on? 
> If so, the module could look for this signal and add the device when turned
> on.
IEEE1284-compliant peripherals power up in compatibility mode with no such
peripheral-initiated communication that you suggested.  In some cases you
might notice a change in the status (peripheral-to-host) lines, but it's
not guaranteed since different host and peripheral parallel ports have
different pull-up or pull-down resistors.

> Windows can handle having the device turned on or off arbitrarily.  How is
> it done?
Windows tries to read the device ID string from the peripheral when it
boots and when you invoke the "Add New Hardware" wizard, just as
parport_probe does when it is insmoded.  I don't think Windows automatically
detects hot-plugging of devices on the parallel port the way it does with
USB devices.

David