Westermo MD-21 DC TEMP Industrial Current Loop to Serial Converter
- 20 mA Current Loop to Serial Converter
- 1 x RS-232 (D-sub female, up to 19.2 kbit/s)
- 1 x RS-232 (screw terminal, up to 19.2 kbit/s)
- 1 x 20mA Current Loop Input (up to 19.2 kbit/s)
- Purpose-built DIN rail casing with integral clip
- 12 – 36 VDC input power range
- –40 to +70°C operating temperature range
- Brand: WESTERMO
- Product Code: 3151-2005
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.
End of Life Product - No Replacement
Please note that the MD-21 has been phased out. You can explore other types of converters in the Converters.
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Specification
| Interface | |
|---|---|
| 100Mb Fiber optic single mode (Megabit) Ports | |
| 100Mb Fiber optic multi mode (Megabit) Ports | |
| Serial port | : 1 x RS-232 (D-sub female, up to 19.2 kbit/s), 1 x RS-232 (screw terminal, up to 19.2 kbit/s) |
| USB | |
| Other ports | : 1 x 20mA Current Loop Input (up to 19.2 kbit/s) |
| Isolation | : 500 V |
| Converter specifications | |
| Data transfer speed ( Baudrate ) | Up to 19200 bit/s |
| Maximum data transmission distance | 6 km |
| Minimum output power converter | - |
| Sensitivity to receiving information | - |
| Wavelength | - |
| Require cable diameter | 42pF/m |
| Flow Control | - |
| Protocols | - |
| Serial Signals | |
| RS-232 Signals | - |
| RS-422 Signals | - |
| RS-485-2w Signals | - |
| RS-485-4w Signals | - |
| Power Requirements | |
| Power Consumption (Output Adapter) | Max 3W |
| Power Input Plugin ( Redundant ) | |
| Overload Current Protection | Supported |
| Reverse Polarity Protection | |
| Input Voltage | 12 – 36 VDC |
| Input Current | 140 mA @ 12 VDC |
| Connector | Screw terminal |
| General | |
| Fan / Fanless | Fanless |
| MTBF | - |
| Physical Characteristics | |
| Dimensions | 50 x 100 x 128 mm |
| Housing | - |
| Installation | DIN-rail mounting |
| Operating Temperature | –40 to +70°C (–40 to 158°F) |
| Operation Humidity | 0-95% RH, non-condensing |
| Standards and Certifications | Ingress; protection: IP20 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 |
| Storage Temperature | - |
| Weight | 0.3 kg |
| LED Indicators | |
| LED Per Port | |
| Power | |
