Adaptor design
Wiring
Software
See the hardware part to setup serial communication. Get serial communication software like coolterm or picocom. Depending on your computer select the right serial port like : /dev/ttyUSB0, /dev/tty.usbserial (type ls /dev/ in a terminal) Setup 19200 baud and default 0D 0A line feed is fine. You can start with AT The modem will answer : OK
Send a message
AT&K0
AT+SBDWT=Hello
AT+SBDIX