The Crestron C2COM-3, identified by part number PA05846-1D, is a legacy Y-bus expansion card that provided essential serial communication capabilities for specific 2-Series control processors, such as the AV2 and PRO2 models. Designed to meet the demands of extensive automation projects, this module effectively added three independent, bidirectional communication ports to the host controller. Its primary function was to enable seamless integration with a wide variety of third-party devices—including projectors, matrix switchers, and security systems—that relied on traditional RS-232, RS-422, or RS-485 communication standards for control and feedback.

A key feature of the C2COM-3 was its impressive versatility. Each of the three ports could be independently configured to operate using any of the three major serial protocols, offering unparalleled flexibility within a single card slot. This design significantly reduced the need for external converters or extra hardware, streamlining installation and simplifying the overall system architecture. The card supported robust data transfer rates up to 115.2k baud and included support for both hardware and software handshaking, ensuring reliable data transmission within commercial and residential AV environments.

While the 2-Series platform has since been succeeded by newer technologies like the 3-Series and 4-Series, the C2COM-3 remains a crucial component for maintaining and expanding existing legacy systems. It represents a period in automation technology where modular expansion was the standard approach to system design. The table below details the specific technical specifications that define this reliable and enduring piece of Crestron hardware.