AWR1843AOP: Supported communication methods

Do-hyun Kim

Prodigy 105 points

Part Number: AWR1843AOP
Other Parts Discussed in Thread: SN65HVD1781A-Q1, , AWR1843

Is RS 485 communication supported?

I am trying to communicate using SN65HVD1781A-Q1. Which PORT of AWR1843AOP should I enter?

9 months ago

0 Kaushik Gowda 9 months ago

TI__Mastermind 20605 points

Hi,

The RS485 protocol is not a supported communication interface on the AWR1843AOP.

Regards,

Kaushik

+1 Do-hyun Kim 9 months ago in reply to Kaushik Gowda

Prodigy 105 points

Connect the signal from the RS 485 communication IC to the UART port of AWR1843AOP and check if communication is not possible.

+1 Do-hyun Kim 9 months ago in reply to Do-hyun Kim

Prodigy 105 points

Although RS-485 communication is not supported directly in AWR1843AOP,

Isn't it possible to use it using the SN65HVD1781A-Q1 IC as shown in the picture above?

0 Jeffrey Chung1 9 months ago in reply to Kaushik Gowda

Expert 2925 points

Hi Kaushik,

Please let me know about Do-hyun's question above. They are waiting for your answer.

Regards,

0 Jitendra Gupta 9 months ago in reply to Jeffrey Chung1

TI__Guru 69520 points

Hi,

You can use this part with AWR1843/AOP connecting with AWR1843 UART lines.

I see there is additional DIR line, if you need one-directional communication then fix this DIR/DE line using HW pull up/down, else for Rx/Tx both flow, you need to connect DIR/DE line with AWR1843 GPIO and drive that high/low from AWR1843 Application based on Read or write action.

Regards,

Jitendra

0 Do-hyun Kim 8 months ago in reply to Jitendra Gupta

Prodigy 105 points

Thank you for answer.

The DE and RE pins must be allocated among the AWR1843AOP pins. Please recommend a pin that supports the 'Auto Toggle function / Auto Direction Control function'.

0 Jitendra Gupta 8 months ago in reply to Do-hyun Kim

TI__Guru 69520 points

Hi,

There is no automatic way to toggle DE/RE pin in AWR1843AOP, as originally AWR1843 device support basic UART not the way with SN65HVD1781A-Q1.

Although to make SN65HVD1781A-Q1 work with AWR1843AoP on bi-directional, you need to write software to control DE/RE line by connecting that to AWR1843 GPIO line and drive it from software. It can not be done in 'Auto Toggle mode'.

In mmWave SDK, you will find the GPIO driver and test application for your reference to toggle GPIO high/low that you can implement in your application to control SN65HVD1781A-Q1 direction.

Regards,

Jitendra

0 Do-hyun Kim 8 months ago in reply to Jitendra Gupta

Prodigy 105 points

Thank you for answer.

In conclusion, the answer is that compatibility is possible by converting the RS-485 signal coming from outside into the UART of AWR1843AOP using SN65HVD1781A-Q1, right? (Settings for DE and RE pins are configured by software)

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AWR1843AOP: Supported communication methods