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The GRX-RS232 and GRX-PRG allow up to eight GRAFIK Eye Control Units to be interfaced with your personal computer or auxiliary audio/visual equipment via RS232. The interface can be used to execute Control Commands and allow for Status Monitoring. The GRX-PRG allows for complete programming of your GRAFIK Eye 3500 and 4500 Control Units from a PC or other RS232 device. In addition, the GRX-PRG provides an internal astronomical timeclock. Included with the GRX-PRG is Lutron's GRAFIK Eye LIAISONTM Lighting Control software that can be used to schedule events, make Super Sequences, and program GRAFIK Eye 3500 or 4500 Control Units.