Isolated RS232 to RS485 / RS422 High-Speed Converter (Industrial)


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The CVT-485_422-4 is a high-speed (300 to 115,200bps), optically-isolated, externally-powered RS232 to RS485 converter / RS232 to RS422 converter, which can be used to convert any standard RS232C port into a two-wire half-duplex RS485 port or a four-wire full-duplex RS485 / RS422 port and vice versa. This industrial externally-powered opto-isolated RS232 to RS485 / RS422 converter supports multi-drop RS485 / RS422 networks and can be used to communicate with one loop of up to 128 units of RS485 / RS422 devices. It operates within a temperature range of -40ºF to 185ºF (-40ºC to 85ºC), features 600W surge protection, 15kV ESD static protection and 2500V opto-isolation circuitry, which effectively protect your RS232 devices from ground loops, noise problems, transient surges, remote lightning and spikes. The unit is powered from an external 9 to 30VDC power supply, so you do not have to worry about the power ability of your RS232 device; it also supports data direction auto-turnaround, which automatically enables the RS485 transceiver when data is present on the RS232 side. Therefore, it requires no port power, software drivers, or DIP switch settings. The built-in 120-Ohm terminator can be turned ON or OFF through a simple jumper wire, thus making the unit an ideal solution for all types of installations. A separate external power supply is included in the package, and, thanks to the professional and unique casing design, the product can be mounted directly on a wall, panel or DIN Rail, without a need of using any unsecured DIN-Rail or wall-mount brackets.

CommFront's products quality is ensured by our ISO-9001 quality control system (Cert No. SG12/04213, strictly certified by SGS), and we back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee.


  • High-speed rugged industrial-grade opto-isolated RS232 to RS485 / RS422 converter.
  • Converts RS232 to 2-wire RS485, 4-wire RS485 or 4-wire RS422 and vice versa.
  • External 9-30VDC powered (included), no port power from the RS232 port required.
  • Industrial grade enclosed in a rugged, rustless ABS housing.
  • 2500V optical isolation.
  • Supports multi-drop RS485 / RS422 networks (up to 128 nodes).
  • Direct DIN-Rail (Rack) or Wall / Panel mounting (stackable).
  • 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
  • RS-485 / RS-422 auto-detection, no manual setting is required.
  • No software drivers, flow control, DIP switch or jumper settings required.
  • Plug and play (hot-pluggable, data format auto-sensing & self-adjusting).
  • Data direction auto-turnaround, no flow control is required.
  • Operating temperature: -40ºF to 185ºF (-40ºC to 85ºC).
  • Built-in 600W surge protection, 15kV static protection and circuit protection.
  • Built-in selectable 120Ω terminator for system reliability and easy installation.
  • Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
  • Safety: Strictly certified by TUV (Cert No. SG-CE-100005; SG-FCC-100002).
  • 5-year manufacturer's warranty.


Part Number: CVT-485_422-4
Compatibility:  EIA/TIA RS-232, RS-485 and RS-422 standards
Power Source: 9 to 30VDC (External AC to DC power adapter included)
External AC/DC Power Adapter: 9VDC / 500mA (Input: 100~240VAC 50/60Hz, US type A plug)
Current Consumption: Less than 30mA
Optical Isolation: 2500Vrms (AC, 1 min)
Baud Rates: 1,200 to 115,200bps (auto-sensing & self-adjusting)
Distance: RS-232: 16ft (5m); RS-485/RS-422: up to 4000ft (1.2km) at 19,200bps
Maximum No. of Nodes: RS-485 / RS-422: 128 nodes
Connector: 1x DB-9 Female; 1x 10-way Terminal Block
End of Line Terminator: 120Ω (built-in, selectable)
Surge protection: 600W
Static protection (ESD): Up to 15KV
Dimensions (H x W x D): 4.7 x 3.6 x 0.9 in (120 x 73 x 33 mm)
Weight: 4.6 oz (130 g) (with terminal block)
Operating Temperature: -40ºF to 185ºF (-40ºC to 85ºC)
Operating Humidity: Up to 90% RH (no condensation)





CommFront products are strictly certified by SGS and/or TUV - the Nationally Recognized Testing Laboratories [NRTLs] in North America (approved by OSHA) and the Notified Bodies in the European Union. Learn More




CommFront products are designed and manufactured to ISO 9001 standards. Our quality control system is strictly certified by SGS (Cert No. SG12/04213). Learn More




CommFront products have been proven to be reliable. We back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee. Learn More

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