Interface and Isolation

Q&A [RS-485] (+24V) convolution to RS-485 line

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[RS-485] (+24V) convolution to RS-485 line

sofy

on Apr 8, 2016

Hello,

I would like to know we have solution or not for the customer's question.

The customer willing to use ADM483. And they want to SUPERIMPOSING DC (+24V) on RS-485 half duplex line.

(And also separate DC and data after receive)

Is there anything solution that we have?

Actually, some video transmit equipment have such a function like as Power over Ethernet.

(example product as below)

B&H Photo Video

Thank you for your help as always.

Best regards,

Sofy

0 RAnslow

on Apr 8, 2016 9:38 AM over 5 years ago
Hi Sofy,

The ADM483 has a Standard RS-485 A, B input common mode voltage range of -7V to +12 V.

The absolute maximum (DC) rating on the A,B pins is –9 V to +14 V.

Adding 24 V DC to the ADM483 A,B bus pins would not be possible.

Best regards,

Richard
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0 sofy

on Apr 11, 2016 5:30 AM over 5 years ago
Hello, Richard,

Thank you for your response!

I understood that.

Mostly ADI parts cover -7V to +12V that I've checked on web also.

And also notice about A, B pins absolute maximum DC (up to +14V).

Best regards,

Sofy
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