Optical Isolation RS-232 to RS-485/422 Converter

  • Support bidirectional data conversion between 1 RS-232 serial port and 1 RS-485/422 serial port
  • Unique serial port self-adaption technology, which can identify RS-485/RS-422 serial port automatically without setting the switch
  • RS-485/422 port adopts independent external power supply, and provides 2500V photoelectric isolation protection
  • Adopt pre-emphasis technology, the communication distance of RS-485 is up to 1800m (115200bps)
  • Serial port provides 1500W surge protection and 15kV electrostatic protection
  • RS-485/422 port provides optional connection ways, including RJ45, DB9M and 5-pin terminal blocks


MODEL485P is a RS-232 to RS-485/422 interface converter that can achieve bidirectional conversion between RS-232 and RS-485/422. It provides 1 RS-232 serial port and 1 RS-485/422 serial port. The RS-485/422 supports serial port self-adaption technology that can identify RS-485/422 serial port automatically without the need of setting the switch. Serial ports are equipped with 1500W surge protection, 15kV electrostatic protection and 2500V photoelectric isolation protection, which can effectively avoid surge and lightning strike. The device also adopts wall mounting, which can meet the requirements of different scenes.

Hardware adopts fanless, low power consumption, wide temperature and voltage design. It can be wildly used in indoor and outdoor system like attendance, entrance guard, cloud platform control, food selling and parking lot, etc.

Serial Port  

Standard: EIA RS-232C, RS-485, RS-422

Serial port quantity: 1 RS-232 serial port, 1 RS-485/422 serial port 

RS-232 signal: TXD, RXD, GND

RS-485 signal: 485+, 485-, GND

RS-422 signal: T+, T-, R+, R-, GND

Baud rate: 110bps~115200bps

Data bit: 8bit

Stop bit: 1bit, 1.5bit, 2bit

Check bit: None, Odd, Even, Mask, Space

Interface type: RS-232 serial port, adopts DB9, Female;

RS-485/422 serial port, adopt 5-pin 5.08mm pitch terminal blocks, DB9 Male or RJ45

Transmission distance: RS-232 serial port, 15m;

RS-485/422 serial port, 1800m (115200bps)

Direction control: RS-485 adopts automatic data flow control technology which can detect and control data transmission direction automatically 

Load capacity: RS-485 supports 32-point polling environment (128-point could be customized)

Interface protection: 1500W surge protection, 15kV electrostatic protection

Photoelectric isolation: 2500V





Power supply indicator, serial port data sending/receiving indicator







9VDC, DC round head

RS-232 port obtains power from the TXD, RTS, DTR signal of RS-232





Static power consumption: ≤70mA

Dynamic power consumption (mean): ≤200mA





Operating temperature: -20~75℃

Storage temperature: -25~85℃

Relative humidity: 5%~95%(no condensation)





Housing: metal, IP30 protection

Installation: wall mounting

Dimension (W x H x D): 62.4mm×22mm×93mm

Weight: 200g






3 years


Available Models RS-232  RS-485/422 Power Supply
MODEL485P 1 1 9VDC