Atac Technology Co., Ltd.

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RS-232 to RS-422/485 with Isolation & Wide Temperature - Model: IC-485IT

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Model: IC-485IT


  • Isolation 3000VDC
  • Operating temperature from -30ºC to 75ºC
  • Industrial specification
  • Fully compatible with PC serial COM ports
  • DC power supply (10~30V) Built in Surge Protector
  • Auto Toggling by hardware
  • Communication status can be monitored through LEDs
  • Dip switch for selecting RS422/485 modes, Terminal Resistance and Echo mode
  • Max. 10 Device Connectivity for RS422 Multi-Drop Mode
  • Max. 32 Device Connectivity for RS485 Mode

This RS-232 to RS-422/485 converter is an efficient solution for applying advantages of RS422/485 to legacy RS232 devices. The converter operates with no extra software installation. With simple DIP switch toggling, RS422 or RS485 can be selected. Also, the product is fully compatible with serial COM port in PC.

Auto RTS Control
Under 1:N communication environment, it is undesirable that multiple devices send data at once, causing electrical collision that leads to an error. In order to prevent this, only one device needs to send data at a time, which means that data I/O control is necessary at certain points. performs automatic toggling by hardware, saving extra programming work.

What is RS485 Echo Mode
The point which is different from the method for RS485 Non-echo mode is that the output signal line by itself is input again to the input signal line. Therefore, it is possible to confirm whether the data sent crashes with the data sent by another terminal or not by reading the echoed data. This operating mode is scarcely used except in some special purposes. On all operation is controlled by hardware circuit so no operation is required by application program.

Using 4-wire RS485
4-Wire RS485 Networking is same as RS422 Multi-Drop Networking. RS422 device is used as master and RS485 device is used as slave in 4-Wire RS485 bus. Although RS422 and RS485 have different electrical standards, most manufacturers make ICs that uses both RS422 and RS485 interface. Therefore, RS422 Multi-Drop and 4-Wire RS485 can be considered equal.

However, there can be difference in software that controls them. Since our device can operate regardless of the application software, it is ok to use without any trouble. In this case, set RS422 Multi-Drop mode.


  • RS-422/485 communication
  • Utility meters
  • Industrial process control
  • Building automation
  • Industrial-controlled Local Area Network
  • Industrial PCs and PC peripherals devices


  • Mode: Asynchronous serial communication
  • Speed: Up to 460.8kbps
  • Connector:
    RS232: DB9 Female
    RS422/485: Terminal Block 7P 5.08mm
  • Signals: TXD, RXD, RTS, CTS, GND for RS232
  • Protection
    15KV ESD Protection for all signals
    RS422/485 signals Surge Protection
  • Distance: Max 1.2Km 115.2Kbps,24AWG twisted pair cable
  • Data Bits: 5,6,7,8
  • Stop Bits: 1,1.5,2
  • Parity: None, Even, Odd, Space, Mark
  • RS422 mode: Point to Point,Multi Drop
  • RS485 mode: Echo, Non-Echo
  • RTS: Auto Toggling
  • Switch
    RS422 Term.Resistor setting
    RS485 Term.Resistor setting
    RS485 Echo/non-Echo selection
    RS422/485 selection
  • Power Input: 10~30VDC Terminal Block 7P 5.08mm
  • Power Consumption: 45mA @24VDC
  • LED: Power,TXD,RXD
  • Isolation: Optical 3000 VDC max
  • Terminal Block: 12~24AWG
  • Terminal Block Pin Assignments:
    RS-422 / RS-422 Multi-Drop / RS-485 4W:
    TX+ (1), TX- (2), RX+ (3), RX- (4), SG (5), VCC (6), GND (7)
    N/A (1), N/A (2), Data+ (3), Data- (4), SG (5), VCC (6), GND (7)
  • DIP Switch
    SW1-SW2-SW3-SW4: Mode
    OFF-OFF-OFF-X: RS-422
    OFF-OFF-ON-X: RS-422
    ON-OFF-ON-X: RS-485 4W, RS-422 Multi-Drop
    OFF-ON-OFF-X: RS-485 2W NO Echo
    OFF-ON-ON-X: RS-485 2W Echo
    X-X-X-ON: RS-422/485 Term.Resistor ON
  • RS-232 Pin Assignments:
    DCD (1), TXD (2), RXD (3), DSR (4), GND (5), DTR (6), CTS (7), RTS (8)
  • Operating temperatue: -30ºC to 75ºC
  • Storage temperature: -40ºC to 85ºC
  • Humidity: 5~95% Non-Condensing
  • Dimensions: 42.5 x 22.5 x 97mm (W x H x D)
  • Weight: 83g
  • Case: PC
  • Approval: CE, FCC, Rohs