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How to connect my Garmin eTrex to ...

On this page I briefly show you the connector possibilities for connecting your Garmin eTrex GPS receiver to a serial (RS232) based device (for example PC, Laptop, PDA).

Note: Read the disclaimer!

pFranc (Larry) designed his own eTrex connectors for both the rectangle shaped Garmin connector and the round Garmin connectors.

Garmin eTrex family

Garmin eTrex connector

Below you will find the connector pinout of the Garmin eTrex connector:

Garmin eTrex connector

You will need this info to hook your eTrex to a PDA or PC.

The serial interafce comes in two froms, a 9-pin variant and a (older) 25-pin variant, both are connected as shown below:

eTrex
Connector
Purpose
to RS232/Serieel
Connector
Purpose
9 PIN
25 PIN
pin 1
Powersupply (+ 3 Volt)
NOT used!
 
pin 2
RXD (Data IN)
pin 3
pin 2
TXD (Data OUT)
pin 3
TXD (Data OUT)
pin 2
pin 3
RXD (Data IN)
pin 4
GND (-)
pin 5
pin 7
GND

Note: In the RS232 column you will find two sub-columns called 9-pin and 25-pin, refering to the two RS232 connector variants. The 9-pin variant is the most common one.

Tip: If you're busy with an eTrex connector anyways then you might want to consider adding external power for the eTrex aswell. Use a 3V powersupply and connect it to pin 1 (+) and 4 (-) of eTrex connector.

The RS232 DB9 connector

This is a well known and well document connector, most of them even have numbering on the connector itself.

RS232 male - frontsideRS232 male - backside

Below you will find tables of both variants of the serial connector.

Note: These pinouts are identical for both male and female connectors!

Note: Notice the swap op pin 2 and 3 if you compare both connectors!

DB-9 Purpose Abbreviation
1
Data Carrier Detect CD
2
Receive Data RD or RX or RXD
3
Transmit Data TD or TX or TXD
4
Data Terminal Ready DTR
5
Signal Ground GND
6
Data Set Ready DSR
7
Request To Send RTS
8
Clear To Send CTS
9
Ring Indicator RI

 

DB-25 Purpose Abbreviation
1
Chassis/Frame Ground GND
2
Transmit Data TD
3
Receive Data RD
4
Request To Send RTS
5
Clear To Send CTS
6
Data Set Ready DSR
7
Signal Ground GND
8
Data Carrier Detect DCD or CD
20
Data Terminal Ready DTR
22
Ring Indicator RI

 

 


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