Linux/ISO3082: Can I use RTS signal of STM32 USART to Control the ISO3082 DE pin ?

user1565130

Prodigy 60 points

Part Number: ISO3082

Tool/software: Linux

In my design, Using STM32F103 + ISO3082 to implement the RS485 Communication.

The USART1_RTS is connected to DE Pin of ISO3082. And sometimes the Error ocurred.

I guess the DE timing is wrong.

How to Control the DE ？ Using GPIO or RTS？ Which is preferred ?

I think RTS is specially used for flow control ,but now Error ocurred.

Wait your reply

over 5 years ago

0 user1565130 over 5 years ago

Prodigy 60 points

0 Manuel Chavez over 5 years ago in reply to user1565130

TI__Genius 17100 points

Hi User,

Welcome to E2E! Can you please share more details of the error?

GPIO is okay to use with the ISO3082, as long as the DE signal ranges from 0V to Vcc1 and has a high/enable level between 2V and Vcc1. We will follow up on whether RTS can be used, but please expect our next response during normal business hours.

Thank you for posting on E2E,
Manuel Chavez

0 Lucas Schulte9 over 5 years ago in reply to Manuel Chavez

TI__Expert 6955 points

user1565130,

Consider using GPIO to modulate the direction of the half-duplex communication as depicted in the diagram above. Let me know if this helps with the error.

Respectfully,

Lucas

Isolation

Isolation forum

Linux/ISO3082: Can I use RTS signal of STM32 USART to Control the ISO3082 DE pin ?