Question about Garmin eTrex Legend GPS Receiver

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Interfacing I can not get my computer and gps to communicate through serial port

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Have you checked to make sure that your serial port is enabled in your computer bios.

to check:

some computers require you to press del while booting other esc.

the message should read somthing in the line

press ???? to enter setup

go to the advanced tab

look in IO (Input/Output) devices or somthing similar.

Make sure Com1 or UART is enabled.

If the device is enabled, then check to make sure that your cable is making a connection properly.

(May require you to open up the unit) if out of warantee

To check that the cable is connected properly on the outside contact to db9 port.

Pin 1 2 5 are used on the db 9

on the inside there is a cable with 4 wires soldered to a board which links the outside to the inside.

Connect your serial cable to the GPS, using a multimeter check continuity by holding red lead on pin 1 of db9 serial port and checking each pin for continuity. only 1 should indicate continuity, continue with pin 2 and pin5 on serial port connector.

If you are sure that there is connection between cable and GPS, check the cable from the soldered points to the GPS Board. If those are ok, then you may have a problem on the board. Would then sugest you take it in for checking.

Posted on Aug 08, 2008

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What connector/interface does your PC has
9-pin or 25-pin connector

If it has 9-pin connector: use the following:
DB-9 RS-232 Serial Connection
or
DB-25 RS-232 Serial Connection

If it has 25-pin connector: use the following:
DB-25 Serial Connection
or
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If you are configuring the computer to use an RS-422A serial port, you need a special cable. Contact the computer or printer network manufacturer to see if an RS-422A cable is available. If no cable is available, contact your computer manufacturer for your computer pin assignments and have a cable constructed.

The default configuration for the serial port on the printer is for RS-232C serial communication. To set the printer to use RS-422A serial communication, change the control panel Serial Menu’s SERIAL setting to SERIAL=RS-422.

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Hi fire1961,

Downloading data from my FURUNO GP-30 gave me no problems. But it took me long time to figure out why I coudn't upload waypoints and routes to the GP-30 via the serial port in my ThinkPad T30.

I tried nearly everything tested the cable, tested a lot of different software and even wrote a little c-program to communicate with the serial port. I also tried a serial-to-usb converter with no results. Then I stumbled over this RS232 Tutorial. According to this - serial ports are not just serial port but can be divided into three general categories:

The types of driver ICs used in serial ports can be divided into three general categories:

* Drivers which require plus (+) and minus (-) voltage power supplies such as the 1488 series of interface integrated circuits. (Most desktop and tower PCs use this type of driver.)
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* Low voltage (3.3 v) and low power drivers which meet the EIA-562 Standard. (Used on notebooks and laptops.)

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So if people experience no result trying to upload data to these old GP-30's from their notebooks and laptops. Then I think it could be a matter of these Low voltage ports not are able to provide the FURUNO device with enough voltage. See the above RS232 Tutorial.

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