Electronics > Projects, Designs, and Technical Stuff
Cypress CY7C65213A-Based RS232 Adapter & Power Supply
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Gandalf_Sr:
Here's the design for the isolated, 'real' (+/- voltages), RS232 Extender.  It fits onto the side connector of my RS232 design above and then has a MAX3227 which I set up and tested on a breadboard.  It is a good choice as it automatically 'sleeps' while there's no traffic and 'wakes up' when RX/TX traffic appears.

It can be built with no isolation i.e. no isolated power supply and no digital converters (approx $5 saving on the BOM).

There's also a couple of pictures, first is the top view of the PCB in Diptrace, second is a 3D rendering from Diptrace.

There's a typo on the schematic, it should say this... "for non-isolated version, omit U1 & PS1 and fit R1, R4, R6, R7" (several ResDefs were wrong).

Let me know if you have suggestions for changes.
coromonadalix:
Seems nice to me, but since i love tx rx traffic led to see if its communicating,   i would try to add cheap standard 3 mm leds ???
Gandalf_Sr:

--- Quote from: coromonadalix on April 10, 2020, 04:06:57 pm ---Seems nice to me, but since i love tx rx traffic led to see if its communicating,   i would try to add cheap standard 3 mm leds ???

--- End quote ---
If this were connected to my RS232 PCB (or most others e.g. Sparkfun one), you'd see the RX/TX lights there? I see LEDs on this extension PCB as unnecessary?
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