To set the air pressure via RS485 you have to have the "TAP" version of the screens and/or the SheetCAM POST. The DCC features work with all plasma cutters and allow setting all of the DTHC parameters automatically and the things like pierce height, cut height, DTHC Delay time, Preset volts, etc. The TAP feaures add the Cut Current (AMPS) and the Air Pressure and ONLY work with the Hypertherm 65 thru 125 that have the optional RS485 serial port and the CandCNC HyT-Connect RS485 SIM Kit. With the right screens the Current and air pressure can be set from the operator console. With the correct POST processor for SheetCAM (and a recent version of SheetCAM) you have access to those parameters in the Tool Table and they load automatically. nominal Air Pressure is 75PSI for most types of consumables.
To get the latest screens use the Master Installer at
http://www.candcnc.com/manuals.htm. It is an auto installer that is menu driven . Backup your MACH3 folder before you do the install. Also there is a SheetCAM Support installer that has the latest POSTS (including the one for TAP) and the matching toolsets for the Hypertherms
TOMcaudle
www.CandCNC.com