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Universal serial converter





RCS770 is a general-purpose serial converter equipped with a USB port, RS232 port and two RS485 ports. Conversion can be done in all directions. Alternatively, this converter can act as a RS485 repeater allowing more RS485 devices to be used, since one bus can normally hold 32 devices. The two RS485 ports can be configured to act as a single full-duplex RS422 port or a four-wire RS485 port. USB, RS232 and RS485 sections are galvanically isolated from each other, which will eliminate ground loops and give more tolerance against disturbances and overvoltages. However, the two RS-485 buses are not isolated from each other.

If RCS770 is connected to a computer via USB, it creates a virtual serial port that can be used just like an ordinary port. Every converter has an individual serial number, and the converter will retain the same COM port number even if plugged into a different USB port on the same computer. This increases reliability. RCS770 is able to pass various serial protocols, including Nokeval SCL, Modbus ASCII, Modbus RTU, and HART. The RS485 direction is changed automatically, no handshake lines are required. RS485 bus is attached via screw terminals, avoiding the need to make solder joints on field.

Load manuals (pdf)

Connection details

bus interface

RS485, RS232, USB, RS422

baud rates

1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200

Power supply

galvanic isolation

2 kV AC/DC

current consumption

<200 mA

supply voltage

24 VDC: 9...30 VDC
USB connection

General information


70 x 85 x 60 mm (WHD)

minimum ambient temperature


maximum ambient temperature


Cable details

cable length

USB 1 m

Data conversions are selectable by jumpers: USB-RS485, USB-RS422, USB-RS232, RS485-RS232, RS422-RS232, RS485-RS485 (repeater)