home *** CD-ROM | disk | FTP | other *** search
- From: akcs.joehorn@hpcvbbs.cv.hp.com (Joseph K. Horn)
- Date: Fri, 24 Jul 1992 04:40:02 GMT
- Subject: Re: another battery drainage question...
- Message-ID: <2a6f84f9.1445.3comp.sys.hp48.1@hpcvbbs.cv.hp.com>
- Path: sparky!uunet!cs.utexas.edu!sdd.hp.com!hp-cv!hp-pcd!hpcvra!rnews!hpcvbbs!akcs.joehorn
- Newsgroups: comp.sys.hp48
- References: <1992Jul20.184424.12250@hubcap.clemson.edu> <2a6d96db.1445.2comp.sy
- Lines: 34
-
- akcs.levenson@hpcvbbs.cv.hp.com (william j. levenson) writes:
-
- > Regarding Joe Horn's response stating "never use I/R for printing,
- > which is like using the HP as a bulky penlight," I don't use a
- > printer so I don't really care but... I thought I read somewhere
- > that the I/R port actually uses less power than the serial port. I
- > think this was because the I/R only draws power in short pulses
- > (i.e. when the "light" is actually on) instead of the serial port,
- > which draws significant power continuously. Does this relate to
- > closing the I/O to conserve batteries?
-
- Yes, the LED is pulsed, but that still sucks power. If Doug Cannon's
- measurements are accurate, IR printing is the worst battery drain.
- Pertinent section follows:
-
- ----------------------------------------------------------------------
- Current | Operation | Other
- ( mA ) | |
- --------| WIRE TRANSMISSIONS -------------------|---------------------
- 2.22 | idle, port closed |
- 3.22 | idle, port open! (connected) | connected to a Mac
- 2.52 | idle, port open (not connected) |
- 8.15 | transferring to a mac | maximum
- --------| IR TRANSMISSIONS ---------------------|---------------------
- 2.22 | idle, port closed |
- 3.22 | idle, port open (wire connected) | figure this out!
- 2.52 | idle, port open (wire not connected) | this one too.
- 7.2 | Transmitting, trying to connect | not a real trans.
- 15.7 | Printing (no printer nearby) | All time high!
- ----------------------------------------------------------------------
-
- Doug specifies that no printer was nearby. This wouldn't matter.
-
- -Joseph K. Horn- -Peripheral Vision, Ltd.-
-
-