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Industrial Externally-Powered Opto-Isolated RS232 to RS485/RS422 Converter

Model: CVT-485_422-4

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The CVT-485_422-4 is an industrial grade (wide temperature range with surge & static protection) high-speed (300 to 115,200bps) optically-isolated bi-directional RS-232 to RS-485 converter / RS-232 to RS-422 converter, which can be used to convert any standard RS-232C port into a two-wire half-duplex RS-485 port or a four-wire half-duplex RS-485 / full-duplex RS-422 port and vice versa. This product features opto-isolation circuitry, which effectively protect your RS-232 devices from ground loops, transient surges and spikes; it also supports data direction auto-turnaround. Therefore, no flow control is required.
The unit is powered from an external 9 to 30VDC power supply, so you do not have to worry about the power capability of your RS232 device.


RS232 to RS422/485 Isolated Converter data sheet

- Rack (DIN-Rail) or Wall mounting for easy installation.
- Converts RS232 to 2-wire RS485, 4-wire RS485 or 4-wire RS422 and vice versa.
- Industrial grade with wide temperature range (-40F to 185F / -40C to 85C), surge and static protection.
- External 9-30VDC powered, no port power from the RS-232 port is required.
- Optical isolation effectively protects RS-232 devices from ground loops, transient surges and spikes. It also eliminates ground loop and noise problems.
- Supports high-speed serial data rates: 300 to 115,200bps.
- Supports up to 128 nodes of RS-485/422 devices.
- RS-485/RS-422 auto-detection, no jumper setting is required.
- Plug and play (hot-pluggable, data format auto-sensing & self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- Built-in surge protection, static protection and circuit protection.
- Built-in 120Ω end-of-line terminator for easy installation.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE/FCC certified.
- 5-year manufacturer's warranty.

120 Ohm End-of-Line Terminator (Built-in)

Self-explanatory, the 120 Ohm end-of-line terminator is to be connected at the end of the RS485/RS422 transmission line. This is important for building a reliable RS485/RS422 system, not only because of impedance matching, but also for the reduction of signal reflections and noise problems.

Note: The 120 Ohm end-of-line terminator adds heavy DC loading to a system and, therefore, it should be connected only when the RS485/RS422's distance is over 660ft (200m).

  • Model: CVT-485_422-4
  • Shipping Weight: 0.5lbs
  • Manufactured by: CommFront

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