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RS-232 is the most common serial interface in use today. This means you can use your SHM-C in RS-232 installations - industrial applications; security systems; UNIX, DEC2, and HP workstation connectivity; and more.
Choose the 4-wire SHM-C Async to transmit data up to 4 miles (6.4 km). Run loopback tests simply by pressing a front-panel button. Open the flip-top lid for quick DTE/DCE selection. Transformer and optical isolation protect your data from electrical interference.