HOW TO FLEXWIRE PTT INHIBIT ENABLE/DISABLE ?

I am having a Flex-1500 and Powersdr 2.7 installed.  I havent found
any settings of how to utilize the Pin 4 as a PTT Tx Inhibit.
 
N6VMO wrote about this in 2010: what is the status on how to use TX Inhibit pin 4 within the powersdr?

> > Scope:  > >  > > Provide a software control option in PowerSDR to inhibit RF transmit  until  > Flexwire pin 4 PTT IN is brought to ground by any external source,  > regardless of the PTT source (MIC, key or digital mode).  > >  > > Flexwire pin 4 PTT IN, when asserted to ground, should also signal  > PowerSDR to switch to TX, regardless of the state of FLEXWIRE PTT IN TX  > INHIBIT ENABLE.  > >  > > Requirements:  > >  > > 1. Provide a software control option in PowerSDR labeled 'FLEXWIRE PTT  IN  > TX INHIBIT ENABLE". Default setting is 'Off', disabled or unchecked.  > >  > > A. If this option is unchecked; Flexwire pin 4 PTT IN functions as  normal,  > signaling PowerSDR and the Flex-1500 to transistion to TX when asserted to  > ground.  > >  > > B. When this option is checked; it will inhibit TX until Flexwire pin 4  > PTT IN of the Flexwire jack is held at ground by an external source, such  as  > a sequencer. When pin 4 in brought to ground by an external source, it  > signals PowerSDR and the Flex-1500 to transistion to TX.  > >  > > By making this an option, users are not required to have to apply a  ground  > to Flexwire pin 4 in order to transmit.

 
vy 73 de Peter