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[aprssig] PocketAPRS with Clie?

scott at opentrac.org scott at opentrac.org
Fri Feb 18 15:15:24 UTC 2005

The Clie (some models, at least) *should* have a 3-volt level RS-232 port on
its connector somewhere.  It's been a while since I looked, but I recall
hooking one up to a serial GPS.  I think you'd need a MAX3232 or pre-built
adapter cable to get a true RS-232 port out of it.

Incidentally, it's not master/slave, it's host/function.  And some PDAs can
function as hosts as well as functions.

I missed the original message, but if you're just trying to connect the Clie
to the D7, I'd look for off-the-shelf cables.


-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Stephen H. Smith
Sent: Thursday, February 17, 2005 10:10 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] PocketAPRS with Clie?

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
won't work.

Stephen H. Smith             wa8lmf (at) aol.com

Home Page:                   http://wa8lmf.com

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