RS485 / RS422 Isolator / Repeater / Converter (Industrial)


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The RPT-485_422-4 is a rugged, industrial-grade, optically-isolated RS485 / RS422 isolator / repeater / converter, which can be used to isolate one group of RS485 / RS422 equipment from another, or to extend the RS485 or RS422 distance to up to 4000 ft (1.2km); it can also can be used to convert a two-wire RS485 signal into a four-wire RS422 signal, and vice versa. This industrial opto-isolated RS485 / RS422 converter / repeater / isolator 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 protects your RS485 / RS422 devices from ground loop, noise problems, transient surges, remote lightning and spikes. The unit supports data rates up to 115.2K Baud, and features data format auto-sensing and self-adjusting, which automatically adjust baud rate, parity, stop bit and other COM port parameters to the devices that it is connected to. Therefore, it requires no DIP switch / jumper settings, software drivers or flow control, making the unit a highly reliable and truly plug-and-play device. 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.


  • Rugged industrial-grade RS485 / RS422 isolator / repeater / converter.
  • Isolates one group of RS485 / RS422 equipment from another.
  • Converts 2-wire RS485 to 4-wire RS422 and vice versa.
  • Extends RS485 or RS422's distance.
  • 2500V optical isolation.
  • 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
  • RS-485 / RS-422 auto-detection, no software drivers or manual setting is required.
  • External 9-30VDC powered (included).
  • Industrial grade enclosed in a rugged, rustless ABS housing.
  • 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.
  • Direct DIN-Rail (Rack) or Wall / Panel mounting (stackable).
  • Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
  • Safety: Strictly certified by TUV (Cert No. SG-CE-100004; SG-FCC-100001).
  • 5-year manufacturer's warranty.


Part Number: RPT-485_422-4
Compatibility:  EIA/TIA 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: 300 to 115,200bps (auto-sensing and self-adjusting)
Distance: RS-485 / RS-422: up to 4000ft (1.2km) at 19,200bps
Connectors: 2x 10-way Terminal Block
Surge protection: 600W
Static protection (ESD): Up to 15KV
Dimensions (H x W x D): 4.9 x 3.6 x 0.9 in (125 x 73 x 33 mm)
Weight: 4.5 oz (128 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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