This Agilent Varian Power Supply 24VDC with RS232 comm port cable can be used without Active Gauge Controllers AGC100, AGD-100, XGS-600 to read the gauge pressure on the LCD of the FRG Gauges. This 24VDC external power source can be directly connected to the FRG-720 or FRG-730 Active Gauges with built in LCD displays. (see middle picture above) This external power source is used instead of an Active Gauge Controller allowing the FRG gauges to read pressure. Input power is 115VAC for the power supply. Operating Instruction Manual and Spec Sheet is available for download in .pdf format below under AVAILABLE DOWNLOADS.