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[on:]

Programming using an RS232 (Serial) Cable in lieu of using USB (FTDI)

I have a question, is it possible to wire up a cable to directly interface an RS232 Serial Port on your computer to program the Microcontroller in lieu of using a USB interface?

It would seem to remove the FTDI dependency if you can just straight program from your serial port!

I know this can be done with other micro controllers (or at least, you used to be able to: eg, legacy PIC).

I am wondering what the Cable Pinout Diagram (Schematic) would be for the RS232 to interface it with the programming pins on the Board?

Thanks so much

[Reply #1 on:]

The problem is that true RS-232 uses signaling voltages that are incompatible with a arduino board and would cause damage unless one first converts the RS-232 voltage levels to serial TTL voltage levels.

 But that aside there are a few arduino 'clone' type boards that are designed to directly plug into a PC RS-232 port. In fact my first introduction to arduino was via a kit version like this one:

http://www.nkcelectronics.com/freeduino-serial-v20-board-kit-arduino-diecimila-compatib20.html

Lefty

[Reply #2 on:]

Thank you so much for the response!

Would you be able to point me to a resource where I could find the pinout diagram? as well as the schematic for converting to TTL ?

thanks so much

[Reply #3 on:]

Thank you so much for the response!

Would you be able to point me to a resource where I could find the pinout diagram? as well as the schematic for converting to TTL ?

thanks so much

I sent a link of it's schematic in my reply to your PM.

Lefty