RFRS232 to USB Converter Explained
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This page describes the RS232 to USB converter and the USB to RS232 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 |
| 4 | GND |
Table-2: USB Side Pins
USB to 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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