[RTTY] IC-706/7000 RTTY Jack

[John Tobias Croteau]

Can someone help me better understand the 1/8" RTTY jack on the back
of the 706 and 7000?

Looking at the manual; the tip is for FSKK, the ring is labeled SEND,
and the collar is GND.  I don't understand what the SEND is.  Is this
the same as PTT?  I normally use simple transistor circuits for my
interfaces.  I presume FSKK would go to my FSK interface, would this
SEND/GND be my PTT circuit?

Thanks

- JT