Programmable Intelligent Communication Controller with LED Display. 1x 5-wire RS-232 or 2-wire RS-485 port, 1 RS-422 port and 1 RS-485 port.Onboard 1 KB Queue bufferThe I-752N series module is equipped with a 1 KB queue buffer for its local RS-232 device. All input data can be stored in the queue buffer until the Host PC has time to read it. This feature allows the Host PC to link thousands of RS-232 devices without any loss of data.3000V isolati..