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MAX232 equivalent IC with Opto Isolation

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prabhukaran3

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Dear Guys,
Cool Morning to all!
I am interfacing My Micro board by max232 to My system.. Micro board consists of 4 relay . Each relay is driving up to 12V 2A current.. Resistive load.. Relays are Isolated by Opto-cuopler (MCT6)... Without load total system is working fine. while connecting load System gets hanging problem.. mean ma application window not responding some times...

For more info:
Relays are Isolated.
Load Tracks is totally separated from Micro controller Unit....
What is the reason for this problem...? Expecting your valuable feedback

Is there any Opto-coupling based Rs-232 interfacing(IC) available in market?
 

Can you post a schematic of the design?

Are the relay loads purely resistive or could there possibly be a reactive component?

You may have issues with Relay Contact EMI.

Relay Protection & EMI Suppression

RC Snubber Noise and Arc Suppressor

Do the symptoms appear during relay switching?

Have you implemented proper safeguards against Back EMF from the relay coils, like a diode?

BigDog
 

you can get the adm3101e as a sample from analog
it is an expensive chip, but for one simple board it's ok, and more if you can get it as sample.
other isolated rs232 interface chips here : https://www.analog.com/en/interface-isolation/rs-232/products/index.html

also Maxim makes an isolated ±2500v version of the max232 : it is the max250
here :
also available as a sample to test your single board.
 
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