I have the FT232RLMG device and a device that uses the RS-485 connection standard. I would like to know if I can connect the TX and RX pins of the FT232RLMG to the device that uses RS-485 directly or do I need some more components?

I have looked for information in the datasheet and found that it specifies in the section typical applications:

  • USB to RS232 / RS422 / RS485 Converters

In the and in technical characteristics says:

  • Data transfer rates from 300 baud to 3 Mbaud (RS422, RS485, RS232) at TTL levels.

Link to datasheet: FT232R

Thank you very much.

  • \$\begingroup\$ No, you cannot connect it directly to either RS-232 or RS-485. In either case an appropriate inverting level shifter and possibly differential converter is required to go from the IC's logic level to the interface signalling standards. \$\endgroup\$ Commented Dec 30, 2016 at 16:07

1 Answer 1


RS-485 uses differential signaling

RS-232 uses single ended signaling

They are not directly hardware compatible.

There are many off the shelf hardware devices that convert from RS-232 to RS-485. I believe single IC components exist as well although the ones I've worked with are RS-232 at 5V and 3.3V logic levels (UART) not full RS-232 voltage levels.

  • 2
    \$\begingroup\$ This mostly misses the point - the FT232 ICs support neither RS-232 nor RS-485, a product based on one which supports those must include a line driver and receiver from the USB IC's logic level to the interface standard level and polarity. \$\endgroup\$ Commented Dec 30, 2016 at 16:06

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.