If you need a converter for industrial environments then we highly recommend using an optically isolated converter which is specifically rated for industrial environments. The MWE820B is a fully optically isolated USB to RS232 / RS485 / RS422 converter with an isolation rating of up to 700V continuous voltage and 3500V spike voltages which will protect your equipment and the converter itself from most types of surges, ground loops and other types of electrical noise commonly seen in industrial environments.
Isolation is achieved by high speed
6N137 isolation optocouplers from Fairchild Semiconductors. The high performance chipset CP2102 from Silicon Labs ensures reliable and solid performance for many years.
This converter can be mounted on a standard DIN rail, one by one or it can be stacked on top of each other to save space; alternatively it can be mounted by screws. It it powered by the USB port so no external power supply is required.
This converter will not create 3 individual virtual COM ports in your computer's Device Manager, it will instead create only 1 virtual COM port which can be used simultaneous for RS232, RS485 and RS422 communication; all 3 physical ports on the converter can be used at the same time for simultaneous data transfers. This means that data is present on the 3 physical ports at the same time; one port for RS232, one port for RS485 and one port for RS422, this way you can actually convert USB data to RS232, RS485 and RS422 at the same time.
After installing the included drivers one (1) virtual COM port automatically shows up in your computer's Device Manager which can be used as if it was a standard built-in COM port.
Overall features
- Industrial grade fully isolated converter
- Combo RS232, RS485 and RS422 converter
- One COM port available
- Port powered, no need for external power
- Screw terminal block
- DIN or screw mountable
- WHQL compliant COM drivers included
- Auto detection of data speed
- Built-in electrostatic protection
- Advanced port settings available
- USB cable included
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Resources
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| SPECIFICATIONS |
| Part number |
MWE820B |
| Operating system |
- Windows 10 (32/64-bit), Windows 8.1 / 8 (32/64-bit), Windows 7 (32/64-bit), Vista (32/64-bit), XP, Server 2003, 2000, ME, 98Se (all WHQL compliant)
- Linux 2.6.x, 3.x.x
- Mac OS X 10.4, 10.5, 10.6, 10.7 and 10.8.
- Windows CE 5.0, 6.0
- Android 4.2
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| Processor |
Silicon Labs CP2102 |
| Power |
5VDC provided by USB port |
| Port 1 |
RS232 2-wire,
output voltage: ~8.9VDC |
| Port 2 |
RS422 4-wire Full Duplex,
output voltage: ~5.0VDC |
| Port 3 |
RS485 2 wire Half Duplex,
output voltage: ~5.0VDC |
| Compatible with |
Modbus RTU/ASCII, BACnet |
| Bias resistors |
Yes |
| Installation method |
35mm standard DIN rail or screws |
| USB interface |
Standard Type B Female |
| Indication LEDs |
Power, Send and Receive |
| Serial ports |
1 (RS232, RS485 or RS422) |
| Signals |
- RS232: TX, RX, GND
- RS485: D+, D-, GND
- RS422: T+, T-, R+, R-, GND |
| Baud rate |
300 to 921600bps |
| Parity |
None, Odd, Even, Mark, Space |
| Data Bits |
5, 6, 7, 8 |
| Stop Bits |
1, 1.5, 2 |
| TX / RX buffer size |
640 byte transmit buffer, 576 byte receive buffer |
| Flow Control |
Hardware or Xon / Xoff |
| COM port accessible by |
Included virtual COM port drivers |
| Special features |
- Event character support
- Line break transmission |
| Optical Isolation |
700V continuous and 3500V spike |
| Electrostatic (ESD) protection |
15KV/ 600W/ms high voltage protection |
| Current draw |
Static: less than 80mA. Dynamic average: less than 150mA |
| Dimensions |
102mm x 69mm x 33mm |
| Interface compliance |
USB1.1,2.0,3.0, EIA/TIA RS-232 |
| Regulatory compliance |
FCC, CE and RoHS |
| Working temp |
–40 to +85 °C |
| Warranty |
1 year limited warranty |
For alternative USB to serial solutions please see our full selection of USB to Serial RS232 adapters
