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Sonsivri > Electronics > Hardware and Tools (Moderator: bbarney) > [Q] RS-232 surge protection circuit
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elcielo
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« on: August 19, 2015, 02:03:48 02:03 »
I want surge protection circuit for RS-232.
plz help me.
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Old_but_Alive
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« Reply #1 on: August 19, 2015, 05:37:12 05:37 »
do you really mean RS232 which is a standard for the voltage levels ( which is roughly +-12V, or UART voltage levels such as 3.3V or 5V
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zab
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« Reply #2 on: August 19, 2015, 07:08:51 07:08 »
Zener diodes and MOVs are used to protect circuit from over voltages. these are selected according to specified voltages,
this may help you
http://digital.ni.com/public.nsf/allkb/D21074403CE0179E86256C1D0068E819
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UncleBog
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« Reply #3 on: August 19, 2015, 07:23:16 07:23 »
Many RS232 transceivers include transient suppression, see http://www.maximintegrated.com/en/products/interface/transceivers/rs-232-transceivers/esd-protected-rs-232.html, for additional protection you can add an external TVS, start here http://www.vishay.com/diodes/protection-tvs-esd/trans-zorb/ .
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« Reply #4 on: August 19, 2015, 10:04:51 10:04 »
Quote from: elcielo on August 19, 2015, 02:03:48 02:03
I want surge protection circuit for RS-232.
plz help me.
Show us what you have done to help yourself...
All your posts have plz help me...
Your in a forum Not Sending Texts via cell phone...
FFS Try help your self first...

RS-232 is a Standard their is tons of stuff on the internet..
you want others to read your mind...
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Gallymimu
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« Reply #5 on: August 23, 2015, 04:07:01 04:07 »
I would suggest buying a part with built in protection.  There isn't much point in adding external components when they are available built in.
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titi
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« Reply #6 on: August 23, 2015, 04:34:18 16:34 »
Hi elcielo,
Here is some standard protection circuits for RS232:



RS-232 surge protector circuit using VDRs


RS-232 surge protector circuit using zener diodes

http://www.epanorama.net/circuits/rs232_protector.html

Best regards.
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