Hello i want to connect to a rs232 device. . the modem that in fact is siemens s35 with rs232 cable has its own power so I'm planning to make the connection from the db9 serial port using only tx,rx, and ground to connect to arduino... Can this be made or do i have to buy something like this ? http://www.cutedigi.com/product_info.php?products_id=4329
how about a garmin gps device that outputs rs232 ? what i want to understand is that using newsoft serial i can connect the same serial devices i connect to the pc , not requiring power of course..
Thanks btw i want to connect the gsm phone to send some sms's.