RS232 to RS485 / RS422 Converter (Industrial / Port-Powered)


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The CVT-485_422-1 is a dual-function, compact, rugged, industrial-grade, port-powered RS232 to RS485 / RS232 to RS422 converter that can be used to convert any standard RS-232C port into a two-wire half-duplex RS485 port, or a four-wire full-duplex RS485 / RS422 port and vice versa. This industrial 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), and features 600W surge protection and 15kV static protection. The unit is efficiently powered from the RS232 data line and it supports data direction auto-turnaround, which automatically enables the RS485 transceiver when data is present on the RS232 side. Therefore, it requires no external power, software drivers or flow control. The ALL-IN-ONE rugged terminal block, which was professionally designed for different requirements, comes with an optional 5V DC input and a selectable 120-Ohm terminator, thus making it an ideal solution for all types of installations.

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.


  • Rugged industrial-grade port-powered RS232 to RS485 / RS422 converter.
  • Port-powered, no external power or RTS, DTR required.
  • Industrial grade enclosed in a rugged, rustless ABS housing.
  • Converts RS232 to 2-wire RS485, 4-wire RS485 or 4-wire RS422 and vice versa.
  • Supports multi-drop RS485 / RS422 networks (up to 128 nodes).
  • 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
  • Operating temperature: -40ºF to 185ºF (-40ºC to 85ºC).
  • Plug and play (hot-pluggable, data format auto-sensing & self-adjusting).
  • Data direction auto-turnaround, no flow control or software driver is required.
  • Built-in selectable 120Ω terminator for system reliability and easy installation.
  • Built-in 600W surge protection, 15kV static protection and circuit protection.
  • Accepts external 5VDC regulated power if the port-power is insufficient.
  • ALL-IN-ONE rugged terminal block designed for different requirements.
  • Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
  • Safety: Strictly certified by TUV (Cert No. SG-CE-090012).
  • 5-year manufacturer's warranty.


Part Number: CVT-485_422-1
Compatibility:  EIA/TIA RS-232C standard and RS-485 / RS-422 standard
Power Source: Port power from RS232 data line
Current Consumption: Less than 10mA
Baud Rates: 300 to 115,200bps (Auto-sensing & Self-adjusting)
Distance: Depending on power from RS232 port, will transmit up to 4000ft (1.2km) at 19,200bps
Maximum Number of drops: 128
Connector: RS232 Side: DB-9 Female; RS485 / RS422 Side: DB-9 Male; Termination Board: DB-9 Female and a 6-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): 0.63 x 1.3 x 3.5 in (16 x 32 x 90 mm)
Weight: 1.34 oz (38 g)
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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