RKC Instrument Inc. Z-COM-A-55 122D 3B20042 Communication Module

RKC Instrument Z-COM-A-55 is a Z-COM host communication extension module designed to pair with SRZ/Z-COM controllers to enable external devices and systems to exchange data with the SRZ control stack. When used with Z-COM functional modules such as Z-TIO and Z-DIO, it supports PLC‑style communication across the SRZ platform, serving as the bridge between the controller and a host PC, PLC, or SCADA system. The unit carries the model identity Z-COM-A-55, with the variant code 122D and part number 3B20042, ensuring this is a dedicated communication extension rather than a standalone controller. It provides two communication modes: the native RKC protocol and Modbus, selectable via DIP switches to set the protocol and data rate, allowing integration with a wide range of host devices. Typical applications include data acquisition, remote monitoring, and control integration for RKC temperature controllers in industrial automation, where reliable bidirectional data exchange with external systems is required.