COM (Component Object Model) is a software technology developed by Microsoft that enables standardized data exchange and communication between various software components and devices. In measurement and automation technology, COM interfaces are frequently used to connect measuring instruments, controllers, computers, printers, and other systems to each other and to exchange data.
COM forms the basis for numerous client-server communication applications. It allows programs to use the functions and data of other applications or devices without having to know their internal structure. This simplifies the integration of different systems and enables cross-vendor communication within complex automation environments.
In practice, COM is often used in conjunction with serial hardware standards EIA-RS232 and EIA-RS485 used. These interfaces are used for the physical transmission of data between devices and are widely used in industrial communication. While RS232 is primarily used for point-to-point connections, RS485 enables the creation of bus systems with multiple participants and longer transmission distances.
In measurement and test technology, COM-based connections are used, for example, to read data from measuring instruments, transmit process data, or exchange control commands between different systems. Many sensors, data loggers, PLCs, and laboratory instruments have serial interfaces that can be accessed via COM ports.
Modern measurement data acquisition systems from Delphin also allow for the connection of a wide variety of devices via serial communication interfaces. This makes it easy to integrate existing equipment and measurement systems and to centrally collect, analyze, and document measurement data.
COM technologies thus form an important foundation for communication between hardware and software components and help connect different systems within a shared automation and measurement environment.