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Date: Tue, 10 Feb 1998 23:00:00 -0500 To: Karen Nakamura From: German Alvarez Subject: gps cable using phoneNet
Karen, enclosed you will find a message I posted on the satellite-nav newsgroup, on how to use a PhoneNet connector to make a mac-gps cable.
I have tested it with excellent results on a g3 machine. I was concerned about using the shield instad of the GND, but it is working OK.
Feel free to edit/trash/publish it. I'm sure you can make it much more clear, my English is disastrous.
Garmin to Mac cable idea To make a cable to connect a garmin unit to a mac, I've used a discarded phoneNet connector with very good results. The main advantages of this approach are: * you are spared to deal with the mini-din 8 connector for the mac * you can easily fit into the phoneNet connector a power supply jack, and if you want to be fancy a voltage level converter. * probable you can get a discarded phoneNet compatible connector pretty easy/cheap. If you are not comfortable soldering, etc. Please ask for help. You can damage your gps or computer. In my particular case I used: * power & data cable form garmin * phoneNet compatible connector (AESP in this case) * 1A 200V bridge rectifier * 14000 micro F 25V condenser * power supply jack, that fits a wall transformer of the appropriate voltage. The idea of the rectifier and condenser is to let you almost use any wall transformer you have available (AC or DC) in particular I wanted to use the same one as I use for the modem to reduce desk clutter, and modem wall adapters are usually AC. Construction: Crack open the phoneNet connector, cut the circuit board inside the connector to use the board like a terminal strip where you connect the wires from the garmin cable to the mac cable. Identify the Txd- (mini-din pin 3), GND (mini-din pin 4) and RxD- (mini-din pin 5) cables in the circuit board, and solder the adecuate cables from the garmin cable. You may not find a direct connection to Ground (pin 4), but you can use the cable connected to the metallic shell of the mini-din connector. It makes no difference in such a short distance and transmission speed. If you want to use the cable to feed power to your gps (recommended only in garmin units with ample voltage input limits (6 - 40V)) connect the power jack to the gps cable, be very careful with the polarity. You can also put a bridge rectifier and condenser between the power jack and the garmin cable (more info on this upon request) to use almost any brick transformer AC or DC 6V - 24V you have available. For more information about macintosh and gps pin-outs, visit: http://www.gpsy.com/cables/ you will also find the excellent software that forced my to build the cable :) /********************************* German A. Alvarez mailto: *********************************/
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