This is a RS-232 Computer Interface Card Module. The RS-232 Interface Module for the 307 Vacuum Gauge Controller allows data output to, and ion gauge control by, a host computer. Output is either by a command-response mechanism or by a talk-only mode which is invoked via a switch on the RS-232 board. A variety of baud rates and byte framing options are available, as well as switches to force the handshake lines to an “always true” condition. See Chapter 6 of .pdf manual for instructions on use. This is the RS-232 Computer Interface Card Module ONLY, MKS Granville Phillips 307 Controller, Cables and Accessories sold separately on this website. The MKS Granville Phillips 307 Vacuum Gauge Controller Instruction Manual can be downloaded below at DOWNLOADS: