Hand Controller Extender

This design is based on the MonoPrice RS-232 Extender over Cat5e cable.  https://www.monoprice.com/product?p_id=3598 It also uses two each RJ12 (6pin) to DB9 Male adapters.  Some of these adapters come with the RJ12 side wiring reversed, so please make sure
that you check for this, and if yours is reversed, then reverse the wiring in the adapter.
The schematic for these adapter wiring is provided in both a JPG format and PDF format.
We will divide the instructions into two sections: Receiver and Transmitter.
Transmitter Instructions
  1. The transmitter unit has the internal +5V voltage regulator removed. This is because the Gemini-2 will be providing power for it.

  1. On the back side of the PCB you will need to add a wire. See the picture for where to add it.  YOU DO NOT USE THE PROVIDED MONOPRICE POWER ADAPTER ON THIS TRANSMITTER ADAPTER.

this brings the +5V from the Gemini-2 to this adapter.
Receiver Section
  1. We will only have to add a wire to the back of the receiver PCB to let the adapter power the hand controller.  YOU  NEED TO USE ONE OF THE POWER ADAPTERS (110/220V to 9V) PROVIDED BY MONOPRICE ON THIS RECEIVER ADAPTER.
No other modifications are required for the Receiver or Transmitter units.

Here are larger pictures of the RJ12 to RS-232M adapters.

Receiver adapter
Transmitter adapter

Make sure your adapter is like this to follow the provided schematics. Otherwise you will have to reverse the wires coming from the RJ12 side of the adapter.

Here is a picture of it in use:

I have tested this adapter with 600 ft of cat6 shielded cable and it worked perfectly.
Of course you make and use these plans at your own risk.
Word of caution: Although G2 and the HC have very good RS232C booster chips, please unplug this adapter  in case of possible lightning - it's a huge antenna. This suggestion was provided by RenĂ©, the Gemini-1 and Gemini-2 programmer.