Westermo Industrial MD-21 AC Current Loop to Serial Converter
- Current Loop to Serial Converter
- 1 RS-232 serial port terminal and 1 RS-232 Male serial port
- 1 20mA Current Loop Input
- Din-rail
- Input power 264V AC to 207V AC
- Brand: WESTERMO
- Product Code: MD-21 AC
Description
The MD-21 is a 20 mA current loop (TTY) converter allowing RS-232 systems to be connected to a 20 mA current loop interface over a distance of up to 6 km (3.7 mi). The serial interface is a standard RS-232 interface with five control signals. Since the communication is totally transparent there is no need for different settings except for if the current loop shall be active or passive.
The MD-21 is designed for use in heavy-duty industrial applications. The different power options, galvanic isolation, and transient protection guarantee communication in the worst environments. The MD-21 has been tested to meet many EMC, isolation, vibration, and shock standards, all to the highest levels suitable for heavy industrial environments.
The design of the current loop converter makes the MD-21 suitable for a variety of applications with various speeds and data bit options. The converter can be used as a standard RS-232 to 20 mA current loop converter or connected in a ring creating a multi-drop network. Being able to act as the current source on both transmit and receive circuits if required ensures that the MD-21 is suitable for any TTY application.
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Specification
Power Requirements | |
---|---|
Operating voltage | 207 – 264 VAC |
Rated Current | 22 mA @ 230 VAC |
Interface | |
RS-232 male | 1 x up to 19.2 kbit/s |
RS-232 detachable screw terminal | 1 x up to 19.2 kbit/s |
20 mA current loop | 1 x up to 19.2 kbit/s |
Physical Characteristics | |
Dimensions | 55 x 100 x 132 mm (2.16 x 3.93 x 5.19 in) |
Operating Temperature | 5 – 50ºC (41 – 122ºF) |
Weight | 0.3 kg |
Degree of protection | IP 20 |
Safety | EN 60950 (1995) |
EMC | SS-EN 50081-1/SS-EN 55022 (1992): Class B, SS-EN 50082-2/SS-EN 61000-4-2 (1995): 4 kV CD, 8 kV AD, SS-EN 50082-2/SS-EN 61000-4-4 (1995): 4 kV power, 2 kV signals, SS-EN 50082-1/SS-IEC 801-3 (1984): 3 V/m |