From ebneter@iap.unibe.ch Mon Jul 31 05:12 GMT 1995 Return-path: Received: from chx400.switch.ch by soulcage.inmind.com (8.6.10/SMI-4.1) id FAA07189; Mon, 31 Jul 1995 05:12:05 GMT Received: from arwen.unibe.ch by chx400.switch.ch with SMTP (PP); Mon, 31 Jul 1995 07:14:53 +0200 X-Sender: ebneter@ubeclu.unibe.ch Message-ID: Mime-Version: 1.0 Content-Length: 2603 Content-Type: text/plain; charset="us-ascii" Date: Mon, 31 Jul 1995 07:14:42 +0200 To: thogard From: ebneter@iap.unibe.ch (Daniel Ebneter) Subject: Re: Using GPS (Garmin 45) with a Mac Powerbook X-Status: Status: RO Tim, >Could you send me the details of that. I've got a PC and it doesn't >like the Mac compressed files. Larry James writes the following in the MacGPS doc: Hardware Interface This is the hardest part of getting your Macintosh to talk to the GPS receiver. The GPS receiver must be connected to the Macintosh modem port (or printer port if the modem port must be in use for something else). Garmin makes a power/data cable for the GPS 45 (P/N 4520, $21.95 from James Associates), and a data cable for the GPS 40 or GPS 45 (P/N 4042, $17.95 from James Associates) which may be wired to a Macintosh mini-DIN connector. Connect the wires as follows (see Inside Macintosh, Volume IV, page 248 for Macintosh connector details): GPS 40 or 45 Macintosh Macintosh connector description with key up ______________ _______________ _________________ Data Out (Brown) Receive Data (5) pin in same horiz. plane as center pin, not as close Data In (White) Transmit Data (3) pin in same horiz. plane as center pin, closest Ground (Black) Ground (4) centermost pin Power(+)(Red) No Connection No Connection The GPS 40/GPS 45 data out is a 0 to 5 volt signal which will drive most RS-232 ports (RS-232 transition levels are typically about 1 to 2 volts). The Macintosh will not respond to this signal if the Receive Data + (8) line is grounded. Good results are obtained on most computers by leaving the Macintosh Receive Data + open, but this may not work with all computers. It may be necessary to bias the Receive Data + line at some positive voltage (about 3 volts). While you're at it, you can also connect a DC power supply (5 to 40 volts DC for the GPS 45, 6 to 8 volts for the GPS 40) between the Garmin Power (red, positive) wire and the Ground (black, negative) wire, and save your batteries. Any adapter rated at 6 to 8 volts with an output current of 250 mA or more should work. Hope it'll work out for you. Daniel ------------------------------------------------------------------------------ Daniel Ebneter University of Bern Diploma Student Institute of Applied Physics Sidlerstrasse 5 email ebneter@iap.unibe.ch CH-3012 Bern CompuServe 100045,2063 Switzerland Voice +41 31631 8944 Fax +41 31631 3765 Mules succeed where horses fail.