Active RS232 to RS422/RS485 Serial Converter Bidirectional Converter Adapter.

Active RS232 to RS422/RS485 Serial Converter Bidirectional Converter Adapter.

CQR1218 is a universal RS232 to RS485/RS422 bidirectional converter, designed to extend the RS232 transmission distance and the interface converter designed for the RS485/RS422 bus, which consists of a number of CQRobot independent innovation technology. It Includes built-in data collision protection control, the power supply and signal lights and inhibition of TVS transient voltages protection. In order to adapt to RS422 / RS485 with much bus wiring, it provides a terminal at port, DB9 and RJ45 physical interface, that effectively adapt to a variety of connection mode, making the bus from multiple directions to be better contacted and more convenient to be implemented. The equipment adopts the aluminum shell of sandblasting and anti-oxidation, which can effectively shield the external interference and have good heat dissipation.

CQR1218 interface converter supports the following four communication modes:

  • Point to point / 4 full duplex.
  • Point to multi-points/four-line full-duplex.
  • Point to point/twine and half duplex.
  • Point to multi-points/two-line and half duplex.

To prevent the reflection and interference of the signal, a matching resistor is needed at the terminal of the line (the parameter is 120 ohm 1/4w) when the converter is used as full duplex or half duplex wiring.



  1. Built-in data collision protection control DCPC function.
  2. The baud rate is adaptive
  3. LED indicates power and signal status.
  4. The maximum support is 32 nodes.
  5. RS232 port protection: 15KV ESD.
  6. The RS485/RS422 port provides surge protection. With Lightning protection of 600W.
  7. The data is bidirectional.
  8. 9V-18V / DC, Power Supply, With EU UK US Plug.
  9. It does not require a handshake signal to achieve transparent transmission.
  10. Plug-and-Play, NO Need to Drive. Supports Windows98 / Windows2000 / XP / Vista / Win7 / Win8 / Win10 / ME, Linux, MAC, Android, Arduino.


  • Working Voltage: 9V-18V / DC, Power Supply For RS232 to RS422/RS485 Serial Converter With EU UK US Plug.
  • Interface characteristics: The interface is compatible with EIA/TIA's RS-232c, RS-485 / rs-422 standard.
  • Electrical interface: Connector with RS-232 interface to input DB9; RS-422 / RS-485 interface: Terminal, RJ-45 and DB9.
  • Protection level: RS-422, RS-485 interface with 600W lightning surge protection of each line.
  • Working mode: Half-duplex asynchronous or full-duplex asynchronous.
  • Signal indication: Three signal indicator light of power supply (PWR), send (TXD), receive (RXD).
  • Transmission medium: Twisted pair or shielded wire.
  • Transmission rate: 115.2k BPS to 300M/38.4 K BPS to 38.4 KM/9600 BPS to 5 km.
  • Dimensions: 113mm * 55mm * 25mm.
  • The using of environment: 25 Degree Celsius to 70 Degree Celsius, relative humidity of 5% to 95%.
  • Transmission distance: 1200 m (115200bps-9600bps).

Distrbution List

  • 1 * Serial Cable
  • 1 * DB9 to 5P Converter
  • 1 * DC 9V-18V Power Supply, With EU UK US Plug.
  • 1 * RS232 to RS485/RS422 Convertor with Charger.

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  • Views: 2620
  • Product Code: CQR1218
  • Availability: In Stock
  • $49.99
  • Ex Tax: $49.99