Abstract: A supervisory control and data acquisition (SCADA) system includes an input/output (I/O) management system in communication with a SCADA application and multiple SCADA devices. The I/O management system is configured to receive multiple request messages, and for each of the messages, forward the request message to a device driver associated with the SCADA device, and establish an asynchronous connection for communicating with the SCADA device. The I/O management system then receives request message data associated with the request message from the device driver, and forwards the request message data to the SCADA device through the asynchronous connection. When response message data is received from the SCADA device, the I/O management system forwards the response message data to the device driver for generating a response message. When response message is received from the device driver, the I/O management system forwards the response message to the SCADA application.