The OPTO-22 AC7A adapter card is a stand-alone RS232 to RS422/485 converter designed to allow seamless communication between devices using different protocols. With support for 120-volt power input, this adapter card is a versatile and reliable solution for integrating and connecting industrial equipment and control systems. Perfect for applications requiring efficient and secure data transfer, the AC7A provides a simple yet effective solution for bridging the gap between RS232 and RS422/485 devices.