Yes, the -PAT (Serial Pattern Generator) is a software-based upgrade for Berkeley Nucleonics arbitrary waveform generators, available for the Models 675, 685, and 686. As a software license, the -PAT option can be added to existing units — however, installation requires the AWG to be returned to Berkeley Nucleonics for the upgrade and recalibration process. Typical turnaround time is 1-2 weeks after the unit is received. The -PAT option enables serial data pattern generation for testing digital communication interfaces and protocols.