This one only has 8 switches to select bal or unbal output. (which i assume would in unbalanced tie "-" to ground.) I popped the hood and it looks like there is a red wire going to pin 2 so i'm guessing pin 2 hot. I'm going to take a multimeter and see if in unbal mode which side goes to ground.
The manual is now online at fostexinternational. The newer version (saw some on ebay) have the switches, the version I have do no, but I am confident it is pin 3 hot.