RFC/9R is an RS232-to-RS422 DB9 converter, designed to convert the RS232 serial standard with a DB9 connector to RS422 with a 5-pin Mini XLR connector. This industrial adapter is self-powered through the D-sub connector. It can be used to connect a PC or industrial device to an RS422 serial bus, converting a DB9 connector with fastening screws to a 5-pin Mini XLR connector.

The device is completely Plug&Play and does not require any drivers or DIP switches. The RS232-to-RS422 DB9 converter operates in Full Duplex mode and automatically detects transmission speeds of up to 250 kbps, making it easy to install in any new or existing system.

Use cases

The compact size of this converter makes it suitable for installations where space is limited and there is physically no room for a traditional DIN rail converter. Another situation in which this RS232-to-RS422 DB9 converter may be required is when a machine has only a DB9 port, or more precisely a D-sub port, and can communicate exclusively through that port. The converter can be securely fastened to the machine on the D-sub side using screws, ensuring maximum communication reliability.

When communication isolation is required to protect the computer against low- or medium-level interference, an isolated converter such as IMC/9R is recommended. However, this device communicates via RS485 and requires an external DC power supply ranging from 5 V to 12 V DC. The converter can be powered from 5 V to 12 V DC through a standard barrel jack and can be connected, for example, to a USB port or to a custom power cable.

RS485 is a Half Duplex standard, but it is much more widely used than RS422. Communication interference is common in industrial environments, and it is good practice to protect devices that communicate with external equipment.

Protocol

The RFC/9R RS232-to-RS422 DB9 converter is completely independent of the protocol being used. This means that the converter is transparent to the communication and can be used with any proprietary protocol.

This is possible because the converter operates at the logic-level interface rather than on the protocol itself. Therefore, this RS232-to-RS422 DB9 converter can be used with any computer or machine that communicates through a DB9 port using the RS232 serial standard.

Versatility

The RS232-to-RS422 DB9 converter is also available with RTS-controlled data direction or with different connector options. For example, the RFT/9R converter is functionally identical to the RFC/9R, but it uses an 8-pin RJ45 connector. The IMC/9R and ISC/9R feature an RS485 interface isolated up to 50 V for applications requiring greater protection, with automatic and RTS-controlled data direction, respectively.

The DFP/9S and DFP/9A industrial serial converters feature a synthetic optical fiber output with a screw connector, providing electrical isolation between devices. The catalogue includes all combinations of serial communication standards, optical fiber types, and power supply configurations. Special requirements, such as higher transmission speeds, can be submitted through the contact form.

Main features

RS232

Mechanical features

Working conditions