i have control relay by ethernet relay board by RS232 connect with arduino board, but it need to add RS232->TTL level adapter, is there a easy way? such as control by TCP socket send command?
Hi, I would love to help but it's a little unclear what your trying to achieve. Share some product links to the hardware that you have, What relay board, Arduino, ethernet shield do you have and exactly which is connected to which? Is the relay board at a remote location that you want to control remotely? Over a local network or the Internet?
No sure exactly what you mean. Can you give us an example?