The Possibilities Of Usb

agility · Posted: 06 Jul 2004 08:41:38 am Post subject:

I thought they only had big sheets of them. Do you think they sell plexiglass cutters?

Brazucs · Posted: 06 Jul 2004 03:19:46 pm Post subject:

go into the store... befriend someone who works there.... then ask them

agility · Posted: 06 Jul 2004 03:35:33 pm Post subject:

Well, it's not on Ace Hardware's website... nor Home Depot's... is there an alternate name for plexiglass?

kermmartian · Posted: 06 Jul 2004 04:29:00 pm Post subject:

Errr...no, it just means that the normal 2 data lines and a gnd connection are there, as per the regular cable... Laughing

You can ask at the store and they'll cut the plexiglass.

agility · Posted: 06 Jul 2004 06:38:22 pm Post subject:

Well then, how do you hook up two calcs with the USB cable then? AND have it work with NO voltage at all?

Brazucs · Posted: 06 Jul 2004 09:49:47 pm Post subject:

Do the normal cables transmit any voltage?? If not, there's your answer.

X1011 · Posted: 07 Jul 2004 12:48:19 am Post subject:

You have to have some voltage to send a signal.

62 52 53 53 · Posted: 07 Jul 2004 07:04:03 am Post subject:

a USB cable has 4 contacts... I think it's 2 for power, 2 for data. Yes, the data ones have power, each has power theoretically half of the time. But not only is that unreliable, but it's nowhere near the 5v of the power contacts. (when said power contacts are connected directly to a normal power source... unpowered hubs reduce this voltage, and so does using ducks to attack the air force... er... forget the ducks... there's no power unless they're being powered, anyhow...)

agility · Posted: 07 Jul 2004 08:07:29 am Post subject:

Well, at least there's some power there when data communication is present through the Mini-USB port and yes, normal cables do have voltage.

There's one + voltage pin, a ground pin, a data+ pin, and a data- pin in a USB connector.

kermmartian · Posted: 07 Jul 2004 03:07:15 pm Post subject:

The regular linkport uses +5v at ~10mA to send signals...

agility · Posted: 07 Jul 2004 04:15:48 pm Post subject:

Are you sure? If so, then why do you have an external power supply for your PS/2 schematics if they run off of 5v?

kermmartian · Posted: 07 Jul 2004 04:33:36 pm Post subject:

Because those data lines use voltage to indicate the presence of a signal: there's no other way to do it. You also need +5v to power the mouse's internal circuit board and PIC processor, light up the underlight (for optical mice), etc.

agility · Posted: 07 Jul 2004 04:35:03 pm Post subject:

Ah, I forgot you used both data lines in your schematic. What if the linkport is idle? Is there any voltage present?

kermmartian · Posted: 07 Jul 2004 04:36:18 pm Post subject:

Data lines high means no signal; if a line is brought low (i.e. shorted to ground), a signal is present.

agility · Posted: 07 Jul 2004 04:46:36 pm Post subject:

Ahh, so it's nActive, or active low.

MissingIntellect · Member Joined: 01 Jun 2004 Posts: 227

Erm, I'm betting it's a "client" USB connection, not a "server" one. Meaning you couldn't connect stuff to it, you can just connect it to a PC.

agility · Posted: 07 Jul 2004 04:49:17 pm Post subject:

No, you can connect two calcs together with a Mini-USB cable and it'll work; just check out the TI84+SE website www.84silver.com
But right now, we're talking about the regular link port.

kermmartian · Posted: 07 Jul 2004 04:49:23 pm Post subject:

Yup, that's what the concensus seems to be at the moment.

agility · Posted: 07 Jul 2004 04:50:10 pm Post subject:

Man, you must type fast or something. I just pushed the 'Add Reply' button!

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