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On Tue, 18 Sep 2012 16:00:00 -0500 |
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Paul Hartman <paul.hartman+gentoo@×××××.com> wrote: |
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> On Tue, Sep 18, 2012 at 3:21 PM, Dale <rdalek1967@×××××.com> wrote: |
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> > Neil Bothwick wrote: |
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> >> On Tue, 18 Sep 2012 13:30:52 -0500, Dale wrote: |
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> >> |
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> >>>>> One would think that modern stuff would have some sort of |
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> >>>>> protection. Odd. |
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> >>>>> |
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> >>>> indeed. The modern stuff with protection is called 'usb'. |
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> >>> Well, I meant for the serial/parallel chips tho. Surely it can't |
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> >>> be hard to at least keep them from blowing their fuse. |
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> >> The problem is in the connectors, it's too easy to get a static |
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> >> discharge when connecting them. USB has grounded shields over the |
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> >> connectors. |
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> >> |
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> >> |
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> > |
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> > |
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> > Somewhat off topic, how about a monitor that uses the 15 pin |
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> > connector? I try not to do those when something is powered up but |
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> > have done it a couple times. Is that one safe to hotplug? I never |
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> > thought about that until this came up. |
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> |
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> VGA is not hot-pluggable by specification, but DVI and HDMI are |
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> hot-pluggable. |
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As someone who's done more electronics work than he ever should, any |
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device that can suffer electrical damage simply by being plugged and |
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unplugged from the thing it's supposed to be plugged into is a shoddy |
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design and really should be in the bin. |
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The only thing I ever found that was susceptible to this was ancient |
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RS232 kit, and the cause was always inadequate shielding and isolation. |
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In the last 10 years I only know of one product sold that has this |
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problem and sadly that's the first run of the Raspberry Pi... |
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You can safely plug and unplug VGA all day long and be hit by lightning |
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more often than damage the monitor, repair techies have been doing it |
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for years. VGA connectors are shrouded, you are virtually guaranteed an |
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earth connection before any of the data pins make contact and you'll |
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never have a situation where 25V is trying to shake hands with 5V (that |
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was a major problem with RS232 stuff). |
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Of course, there's no guarantee the picture will show on the screen if |
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you hotplug VGA, but there's no inherent danger of damage either. |
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-- |
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Alan McKinnon |
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alan.mckinnon@×××××.com |
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