ISOW1412: Half-duplex

Shuji Ishiwata

Part Number: ISOW1412
Other Parts Discussed in Thread: ISO1412,

Tool/software:

Hi All,

A and Y are shorted, and B and Z are shorted to enable half-duplex communication.
I'm sometimes having trouble switching between transmit and receive in 485 communication.
When transmitting from ISO1412, set the DE and RE pins high.
When receiving, set the DE and RE pins low.
In this way, DE and RE are switched between transmit and receive.
Is there any need to consider the timing when switching?
For example, do I need to wait a few seconds after switching, etc.

Also, can you confirm that the following pin settings are correct?

EN/FLT=High
IN=GISOIN pull-down
OUT=Open
The MODE pin is set to open because VDD=VIO=3.3V.

Best Regards,
Ishiwata

1 month ago

0 Varun Kumar 1 month ago

TI__Expert 8790 points

Hi Ishiwata,

Thanks for reaching out and providing inputs but the connections are not fully clear from the text above.

Can you please provide the ISOW1412 schematic connection for us to review better.

Regards
Varun

0 Shuji Ishiwata 1 month ago in reply to Varun Kumar

Mastermind 8050 points

Hi Varun,

Thank you for your support.
The schematics are confidential, so I'd like to send them to you in a private message.

Best Regards,
Ishiwata

0 Varun Kumar 1 month ago in reply to Shuji Ishiwata

TI__Expert 8790 points

Hi Ishiwata,

Then allow us some time to communicate you over your registered email by 9-Oct.

Hope that is okay. Closing this thread for now

Regards
Varun

0 Shuji Ishiwata 1 month ago in reply to Varun Kumar

Mastermind 8050 points

Hi Varun,

Thank you for your support. We look forward to hearing from you.

Best Regards,
Ishiwata

0 Shuji Ishiwata 28 days ago in reply to Shuji Ishiwata

Mastermind 8050 points

Hi Varun,

Thank you for your support.

Regarding the ISOW1412 switching, there appears to have been an issue with the MCU.
The customer resolved the issue themselves.

I have an additional question.
The ISOW1412 send and receive commands (DE, /RE) are controlled from the MCU and switched simultaneously.
Are there any restrictions, such as a wait time (which stops both send and receive), when switching?

Best Regards,
Ishiwata

0 Varun Kumar 27 days ago in reply to Shuji Ishiwata

TI__Expert 8790 points

Hello Ishiwata,

No. there are no such timing spec related to ISOW1412

The DE and RE and can even be connected together and given to one single control, since they are complementary to each other

Regards
Varun

Isolation

Isolation forum

ISOW1412: Half-duplex