Westermo Industrial MD-21 AC
Product Overview
The MD-21 is a versatile 20 mA current loop (TTY) converter that enables RS-232 systems to connect to a 20 mA current loop interface over distances up to 6 km (3.7 mi). The serial interface provided is a standard RS-232 with five control signals. Since the communication is completely transparent, there are no complex settings required apart from choosing whether the current loop should be active or passive. Designed for heavy-duty industrial applications, the MD-21 offers various power options, galvanic isolation, and transient protection to ensure reliable communication even in the harshest environments. It has been rigorously tested to meet stringent EMC, isolation, vibration, and shock standards, making it highly suitable for demanding industrial settings.