RS-232 Isolation Protector

  • Support transparent data transmission of 1 RS-232 serial port and provide 2.5kV optical isolation protection
  • Unique port-power technology that needs no external power supply, and low power consumption make it true passive
  • Automatic serial port signal rate detection, support serial port baud rate 300bps~921600bps
  • Support 600W surge protection and 15kV electrostatic protection
  • Plug and play, compact size, easy installation
  • Support 0~70℃ wide operating temperature range


MODEL 232I/9 is a cost effective passive pocket RS-232 serial port isolation protector which can implement 2500VAC photoelectric isolation between RS-232 serial ports. This product provides 1 RS-232 serial port DB9M and 1 RS-232 serial port DB9F. It’s also equipped with 600W surge protection and 15kV electrostatic protection, which can meet the requirements of different scenes.

This product has compact size and convenient installation. It can prevent the RS-232 port from being damaged by induced voltage after multiple insertions. MODEL 232I/9 adopts unique port-power technology that it can obtain power from TXD, RTS and DTR signals of RS-232 port. It can operate normally even when only TXD signal supplies power. It can truly achieve passive effect with its extremely low power consumption. This product has industry-leading isolation technology which could provide device with AC2500V isolation ability and not affect the normal operation of the device.

Serial Port  

Standard: EIA RS-232C

Serial port quantity: 1 RS-232 DB9M serial port, 1 RS-232 DB9F serial port

Baud rate: 300~921600bps

RS-232 signal: RXD, TXD, GND, 

Transmission distance: RS-232 serial port, 15m

Interface protection: 600W surge protection, 15kV electrostatic protection

Photoelectric isolation: 2500V







No external power supply required

Device obtains power from TXD, RTS, DTR signals of RS-232 serial port





Static power consumption: ≤10mA

Dynamic power consumption (mean): ≤45mA





Operating temperature: 0~70℃

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





Housing: plastic

Dimension (W x H x D): 62.5mm×33mm×16.5mm

Weight: 30g






3 years


Available Models RS-232(DB9 Female) RS-232(DB9 Male) Power Supply
MODEL232I/9 1 1