Curious me wanted to know the pinout of the plug on the back of my Hitec radios. Some time ago I made up a buddy cord for the Hitec Optic 6 and Hitec Laser 4. It took me a while to retrace those steps and find all the information used to make that cable. So here it is, this is how I made my Hitec buddy cord.

Below is an (ugly) ASCII drawing showing the pinout of the trainer cord connector on the Hitec transmitter. I found a much nicer version of this diagram on this page: Tx Trainer Connector Pinouts.

            -------            1  ----  +V Switched
         /           \         
        /      3      \        2  ----  PPM Out
       /  2    o    4  \       
           o       o           3  ----  PPM In
      |                 |      
      |  1o    o    o5  |      4  ----  +V 
      |        6        |      
                               5  ----  High to Disable RF
        \             /        
         \  7 ___    /         6  ----  DSC 
          \  /   \  /          
            -------            7  ----  GND/Shield

And coming right up… This is how I assembled the trainer cord. Two DIN connectors are required and a chunk of cable. The cable only works one way, one connector is therfore labeled master and the other student.

    Student              Master

      1  ---------------–  1 
      2  ---------------–  3
      3  ---------------–  2
      4  ---+
      5  ---+
      7  ---------------–  7
 
    Note: pins 4 and 5 bridged on student side

Some words of warning!
The information presented is provided “as is” without any guarantees or warranty. I will not be responsible for any damage or losses of any kind caused by the use or misuse of the information.