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Fez domino with rs232 Arduino


#1

Helo,
I made a small board with a max3232 (3,3V) to exchange data between the Fez and an external device that works fine; now I bought a rs2323 arduino shield (http://www.ghielectronics.com/catalog/product/182), and nothing works ; anybody knows if there is any incompatibility betwwen these 2 devices?
Thanks for the help


#2

First, you should verify that the serial board is working properly. To do this, put a jumper between RX and TX of the serial board output, and write a program to write and then read the serial port. If this works, then the board is ok.

If the board is ok, then you might have a DTE/DCE issue. You might have TX->TX and RX->RX wiring now.


#3

Thanks for the help,
Unfortunatly it does not work; I think I have a damage shield.

thanks for he help


#4

Hi general… I’ve been looking at the USBizi pdf manual lately for another topic… The manual states; (the DOMINO uses the USBizi Chipset LQFP 144 “LPC2388FBD144” ) in the UART section pg 28, that ONLY COM2 UART1 is Hardware Handshaking supported… meaning that the shield might be using a UART feature that is not supported in your set up… thats my guess ??? … I hope this helps you.


#5

Hi
Thanks for the tip; the problem was the rs232 board.
thnaks


#6

I’m not sure that this Shield is the same as this one, from cutedigi

http://www.cutedigi.com/product_info.php?products_id=4329

I looked at the schematic:
http://www.cutedigi.com/pub/Arduino/arduino_RS232.pdf

It looks like they used 5V power!
Check your shield if it use 3v3 or 5V.

The problem might be here!


#7

Hi,
In fact it is a 5V shield; but as you can see in ‘http://www.ghielectronics.com/catalog/product/182’, it is attached to a Fez Domino; I beleive the inputs and outputs of the Fez are 5V tolerant.
In fact if you look to the Fez documentation the UART is TTL level compatible

I found that the problem was the shiled it self.

Thanks anyway


#8

if you enlarge this

http://www.ghielectronics.com/catalog/product/182

you can see it is the same board as

http://www.cutedigi.com/product_info.php?products_id=4329


#9

Yes is the same, but the thinga are running now thanks