Yes you need a ground reference connection. Join the Data TX and RX together onto the data pin and it works.

I made my own cable for the VX-5 and it works.

Regards Bob VK2BYF

On 30 September 2014 05:00, <chirp_users-request@intrepid.danplanet.com> wrote:

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Today's Topics:

1. Re: Homebrew cable for Baofeng UV-5R/Yaesu VX-7R based on
CP2102 UART (YT9TP Pedja)

---------- Forwarded message ----------
From: YT9TP Pedja <yt9tp@uzice.net>
To: Discussion of CHIRP <chirp_users@intrepid.danplanet.com>
Cc:
Date: Sun, 28 Sep 2014 21:08:24 +0200
Subject: Re: [chirp_users] Homebrew cable for Baofeng UV-5R/Yaesu VX-7R based on CP2102 UART
On 28.9.2014 13:16, Mark Lewis GW7KDU wrote:

I found this pin out for the VX-7R
http://www.kc8unj.com/pinout.jpg
This seems to be similar to the Baofeng UV-3R (as shown on the Miklor
page) but is a Ground connection required?

It seems like VX-7R uses one pin for data and it is bidirectional. If that is the case then you should add some more components to convert bidirectional single pin to standard RX/TX serial connection.

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