ISO3082: circuit

Prodigy 80 points

Replies: 2

Views: 37

Part Number: ISO3082

Hello , ISO3082 is a half duplex IC.

My doubt is:

1. If RE is connected to GND, then it is always in receive mode. Now if DE is also high. transmission will happen. Can transmission and receiving happen simultaneously in half duplex? Isn't it supposed to be one by one.

2. Do we need R132, R13 in the circuit ? If yes, why?

3. What is the purpose of R20 and R135? can we eliminate them?

Thank you in advance.

2 Replies

  • In reply to Tanvi Mahajan1:

    Hi Tanvi, 

    Thanks for asking your question on E2E!

    The last attachment you posted didn't seem to load properly on my end. Can you please try to re-post it?

    Please see answers to your questions below:

    1. If RE is connected to GND, then it is always in receive mode. Now if DE is also high. transmission will happen. Can transmission and receiving happen simultaneously in half duplex? Isn't it supposed to be one by one.

    You are correct that TX and RX cannot happen simultaneously as there is only one bus and so there would be a bus collision. You could tie both of these pins as described and handle not transmitting while there is already data on the bus at the software level on the MCU. 

    2. Do we need R132, R13 in the circuit ? If yes, why?

    Can you re-upload the image? I cannot quite make out which resistors are R132 and R13.  

    3. What is the purpose of R20 and R135? can we eliminate them?

    Can you re-upload the image? I cannot quite make out which resistors are R20 and R135.

    Please let me know if you continue to have issues uploading the image and I will figure out another way for us to share files. 

    Best regards, 

    Dan