IC485IT – RS232 to RS422/485 with Isolation & Wide Temperature

1 x RS232, 1 x RS422/485, Isolation, Wide Temperature


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.

Mode : Asynchronous serial communication
Speed : Up to 460.8kbps
RS232 : DB9 Female
RS422/485 : Terminal Block 7P 5.08mm
Signals : TXD, RXD, RTS, CTS, GND for RS232
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
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
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)
RS-485: N/A (1), N/A (2), Data+ (3), Data- (4), SG (5), VCC (6), GND (7)
DIP Switch
SW1-SW2-SW3-SW4 : Mode
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 : -30 to 75 °C
Storage temperature : -40 to 85 °C
Humidity : 5~95% Non-Condensing
Dimensions : 42.5 x 22.5 x 97 mm (W x H x D)
Weight : 83g
Case : PC
Approval : CE, FCC, Rohs

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

    Please complete and submit the following form, we will respond to you as soon as possible.


    Print Friendly, PDF & Email