RS232 to USB converter | USB to RS232 converter
This page describes RS232 to USB converter and USB to RS232 converter.
RS232 to USB converter
Figure-1 depicts 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:RS32 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 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 FT232R which is a USB to Serial UART
interface converter from Future Technology Devices International Limited
or any other similar converter IC.
As shown following pin numbers are used as USB connector interface on FT232R device.
Pin 15 USBDP- I/O USB Data Signal Plus
Pin 16 USBDM- I/O USB Data Signal Minus
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