[. . . ] Crestron SPC-122 SmartPresenterTM Cable SmartPresenterTM Cable: SPC-122 The SPC-122 is designed for the SmartPresenterTM and used to control specific serially-controlled devices. [. . . ] The SP-1 recognizes the Q-Code as an RS-232 switching device and outputs commands for that device to the PC port (rather than the OUTPUT 4 port). Use the SPC-122 to connect the SP-1 to the serially-controlled device (refer to illustration below). Only those devices with a cable code "c" designation in the Crestron Q-Codes table (latest version of the SmartPresenter Quick Guide, Doc. 5742) require the SPC-122. Hookup Connection for Controlling a Serially-Controlled Device SERIALLY-CONTROLLED DEVICE SPC-122 Crestron Electronics, Inc. [. . . ] 5780 SmartPresenterTM Cable: SPC-122 07. 99 Specifications subject to change without notice. [. . . ]