[aprssig] PocketAPRS with Clie?
Stephen H. Smith
WA8LMF2 at aol.com
Fri Feb 18 00:10:21 CST 2005
J. Moen (K0ZXU/6) wrote on 2/17/2005, 3:41 PM:
> I think I'm doomed here, but maybe someone else has figured this out.
> The Clie's connection to PCs is via USB. I have a USB to serial
> adapter, but that adapter (I think) depends on the 5 volts that USB
> sources like PCs usually provide. Obviously the D7's "PC out"
> connector has no DC. I guess I could rig up a small battery pack to
> provide a bit of power to the adapter, but before fooling with all
> that, I thought I'd check the experts.
5 VDC power is the least of your problems.
USB devices fall into to two classes: "MASTERS" (controllers that assign
a USB device it's identity) and "SLAVES" (peripherals devices that
depend on the master to be told what to do). SLAVE devices can only
interface to a MASTER; not another SLAVE. [The two different styles of
USB connectors recognize this relationship. The wide flat "A" plug
always faces toward a master while the beveled square "B" plug always
faces toward a slave device.]
Normally a master would be the full-size PC. The PDA acts as a slave to
the PC, just like a printer, scanner, external hard drive, keychain
flash drive, USB-to-serial "dongles", digicam, etc. [Logically, to PDA
sync utilties on the PC master, the PDA appears to be merely a bunch of
flash memory in a box, not another computer. ]
Trying to connect a USB-to-serial dongle to the PDA would amount to
connecting one slave device (the dongle) to another (the PDA) -- it
Stephen H. Smith wa8lmf (at) aol.com
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