RA-DR1X DB9 Pinout:

1 - Right (Aux or Tone) Output

2 - Left (Main or Voice) Output

3 - COS Logic Input - (pull near ground required for valid input)

4 - CTCSS Logic Input - (pull near ground required for valid input)

5 - PTT Output

6 - Discriminator / Detector or Receiver Audio Input - (level controlled by potentiometer)

7 - Local Control (Control Revert) Logic Output (Use with JU1 and JU3 - see note below)

8 - Ground - (Digital and Analog)

9 - External Audio Amplifier Power (6 to 15 VDC) (Use with JU2 - position B)


Local Control is a logic option that can enable the internal DR1X control method.  
This feature of enabling internal controls will allow the repeater to operate locally if 
the Asterisk application, computer, or RA-DR1X should fail.  JU1 and JU3 controls this 
function, explained below.

Jumper JU1 - Control Revert logic polarity - Set to "B" position for DR-1X.
Jumper JU3 - DR-1X internal controls enable - Set to "B" position for DR-1X.

Jumper JU2 - Audio amplifier powering.
Position A = Amplifiers powered from USB 5VDC. Suitable for many radio applications where 
  the maximum required P-P voltage doesn't exceed 5 volts.
Position B = Amplifiers powered from external source 6 to 15 VDC. Some radios, like the 
  Yaesu System Fusion, may require more than 5 volts P-P of audio. Many radios have a source 
  of 10 to 15 volts readily available. Must be well filtered but regulation isn't necessary 
  as long as enough current is available for the load. Driving speakers will require a power 
  source capable of several hundred mA., depending on speaker impedance and desired listening 
  level.