Use a cheap phone sync cable with the serial port

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What do i need?

We organized some futuredial phone sync cables mentioned at Section "USB-Connection". These phone sync cables are quite cheap at ebay. you can buy any other cable mentioned at that wikipage...the only difference will be the color coding of the cables.
OR: buy some from here: here is the pinout:
Polarlink cable profilicchip pinout.JPG
Quotation from
Most of the cheap cables are based on a Prolific PL2303 chipset (PL2303 datasheet ) which is supported under Windows (Driver Download) and Linux. A third party Nokia data cable for a 8000 series phone has been used with no problems. A data cable from the Siemens C25/35/45 works too. The cables from the old models (i.e. C25) costs a 2..3$.
Quotation end

Comment: Find many more pinouts at

What to check first

Open the dongle in the middle of the cable to check if the profilic chip is used. You need to check the color coding of the wires. Best would be to just leave the dongle open. In my example here we have the color coding for the FutureDial-Cables. If you have a different one check for the color coding.

Profilic usb-serial chip.JPG

Open the phone connector of the cable

Phone connector.JPG
you can slide out all the cables ends out of the connector. Use flat nose pliers.

Prepare the phone sync cable

Serial cable LS Pro wires1.JPG
Serial cable LS Pro wires2.JPG

Solder the phone sync cable to the USB-plug

You will have both read and write access if you solder it that way.

In this picture: Green is GND, Yellow is RX (as in "data entering the LSPro") and Orange is TX (as in "data coming from the LSPro"). The not connected terminal is VCC.

Phone sync cables soldered to the connector.JPG

Software Installation

General Settings

Baud: 115200
Databits: 8
Parity: N
Stopbits: 1


You need a Windows driver for the Prolific USB-to-Serial adaptor, available at the Prolific Technology Inc Support Site. The cable will show up as COM4.


Plug the USB connector into your Linux box. Start minicom and set the port to /dev/ttyUSB0 115200 8N1. Power up and you will see a '+' printed.