I wasnt saying I didnt know how do do it (now) just that it was kinda confusing the first time.

For a single PX600 system, set the System code to "0".
In a multi PX600 system, set the System code to the number of the PX600's you have. When in the "UP" or "ON" position the switches have these values:
SW5=1
sw6=2
sw7=4
Add the together to get totals equal to the system number, up to System 6.

Clear as mud!! If you have one 600 it is considered system zero, but if you have two 600 the first one is now considered system 1. Why the need for system zero, if you can change it to system 1 if you add a system 2?
dont have to answer, just expressing.

If I'm not mistaken it has been changed on the PX700.

CB1