RS232 to USB Converter Explained

rs232
usb
converter
interface
serial communication

This page describes the RS232 to USB converter and the USB to RS232 converter.

RS232 to USB Converter

RS232 to USB converter

Figure-1 depicts a simple RS232 to USB converter.

It converts RS232 signal levels to USB signal levels.

Following table-1 mentions RS232 side pin descriptions and signal designations.

RS232 Pin Descriptions
2 (RXD)Receive Data input
3 (TXD)Transmit Data output
7 (RTS)Request to Send
8 (CTS)Clear to Send

Table-1: RS232 Side Pins

Following table-2 mentions USB side pin descriptions and signal designations.

USB Connector Pin Descriptions
1+5V
2-Data
3+Data
4GND

Table-2: USB Side Pins

USB to RS232 Converter

FT232RL-USB vs RS232 converter

The USB to RS232 converter does the reverse of the above functionality.

It converts USB signal levels to RS232 signal levels. The same cable as mentioned above can be used with proper mating connectors. This converter typically uses the FT232R, which is a USB to Serial UART interface converter from Future Technology Devices International Limited, or any other similar converter IC.

As shown, the following pin numbers are used as the USB connector interface on the FT232R device.

  • Pin 15 USBDP- I/O USB Data Signal Plus
  • Pin 16 USBDM- I/O USB Data Signal Minus
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RS232: Advantages and Disadvantages

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RS232 to RS485 Converter Explained

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RS232 to TTL Converter Explained

Understand the differences between RS232 and TTL converters, including pin descriptions and logic level differences. Learn about related interface types.

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