Uploading with the RS232 Serial port

Forum 2005-2010 (read only) Hardware Interfacing
1

I am using the Diecimila board with the hope of communicating via rs232 cable but the board has only the USB connection. I have taken a serial cable and connected the ground, tx, and rx lines to ground, pin1, and pin0 on the Arduino, respectively. Without using the MAX3323 serial driver chip, will this work? I want to upload to the board and run programs only using the rs232 cable; no USB. I have an external power source attached.

I have windows xp, the diecimila board, and I can upload to it with USB and COM3. When I try to upload with COM1 on the rs232 cable, I get the following error:
avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

Also, is there someplace that I can control the serial communication protocol (i.e. parity, start/stop bits...)?

I apologize if this has been answered already. I have read many postings and haven't found an answer. Thank you for your patience.

buggaby

2

I don't have much experience with that, however I think you will have to look at the voltage coming from the computer through the rs-232. I believe its +-12v and the arduino can only handle 0 to +5v.

3

It won't work directly, there has to be some form of level switching such that the Arduino doesn't see the negitive and too high voltages that the RS-232 uses.

My suggestions is to just get this RS-232 Arduino clone kit, it's cheap and you never can have too much Arduino around. I've been using this board for some months now and it works great, I even upgraded it to a 328 chip.

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

Lefty