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Soldering

By now you should have one of these. It is an RCL-1 TTL Converter capable of converting 3-5v down to RS232 voltage. These are available here.

You will want to remove the small end as we do not need the plug. Just use a little screwdriver and press in the tabs removing each wire from the plug. Doing this will save you wire end and you won't need to strip back any of the white insulation.

Be sure to tin your leads and solder together the Brown and Blue wires. Remember, you can click on any photo to get the full size image.

 

 

Now let's position the board like below. I have marked out the pins on the particular plug joint you are going to solder. Your pin out assignments are there as well.

Just to be sure, here are your pin assignments:

PIN

SIGNAL

Description

RLC-1 TTL Converter

1

Battery

Backup Power

 

2

+5V PWR

Main Power

Vcc/White

3

Ground

Ground

 

4

VPP

Flash Memory Programming

 

5

RTCM In

DGPS Correction Input

 

6

1PPS

1 Pulse Per Second Signal

 

7

1 PPS RTN

1 Pulse Per Second

 

8

TTL TXD

Transmit Logic 5V

Data Out/Red

9

TTL RXD

Receive Logic 5V

Data In/Green

10

TTL RTN

TTL Signal Ground

Power and Signal Ground

After you are finished, it should look something like this:

Please be double sure you don't have any solder jumping between connections. Tape your two soldered leads up, and run a piece of safeguard tape over the soldering you completed.

To get the plug out of the box, I bent up one of the small tabs on the back of the unit.

Ok kids, you're done. You now have your modified Onstar communication unit with your RCL-1 TTL Converter connection. Well, at least almost. Now to put the whole thing back together. You might want to slide your Onstar unit back into place, connect the power plugs, antenna and battery. Once you have everything plugged back in, turn your ignition to the run position and be sure your Onstar lights green and stays green. You can even call your Onstar Operator and have them check the system. All you want to know is if it is still working properly. It should. If it doesn't, you did something wrong.  You can continue to the Using Onstar Interface Page now if you would like to test it out.

After Mounting, connect your serial extension cable and run to your liking. You might want to use a zip-tie to hold your cable in place.

I ran mine down to the center console cubby (bench seat). It is a great place to hide the cable as well when not in use.

 

 

Let's Move On To Using Your New Interface

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