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Schematic review

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JimB

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Depending on what you are connecting to "K2", there could be a problem in that the signal levels at that port are not RS232 but TTL.
If you need true RS232 levels at K2, you would be advised to use a MAX232 or similar between K2 and U3 (or possibly instead of U3).

JimB
 

bryan

Member
K2 is connected to a serial port of a aquarium controller. Cracking the box of this controller and the serial port is driven by a maxim232 -->microcontroller.

Computer-->DIY Opto Isolator-->maxim232-->microcontroller


Depending on what you are connecting to "K2", there could be a problem in that the signal levels at that port are not RS232 but TTL.
If you need true RS232 levels at K2, you would be advised to use a MAX232 or similar between K2 and U3 (or possibly instead of U3).

JimB
 
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