It's a USB to serial converter. The workings don't matter as I only need what I found out was a switching relay to cut the switch curcuit.
What this does is hooks my computer to the Shooting Chrony serial port.
I can download info then.
The Switch is called a Funcution Switch. It steps through options on the chrony when connected.
Problem is you can't use the FU switch when hooked in to the serial port.
Thus the FU name?
Now imagine the new chrony I have that has the FU button next to the Forget button!!
FU and Forget!!
Now. Does the Timer button figure out when I hit FU and feed me the time till I hit Forget?
The Red ST button scares me! Not sure I want to know what it does!