● Adding an RS-232C interface to a system is easy all that is required is an external level shifter to convert the serial transmissions to and from RS-232C levels.
● Maxim makes a huge range of RS-232C interface chips (level shifters) that greatly simplify your design.
. Many computers do not come equipped with RS-232 ports and must use either an external USB-to-RS-232 converter or an internal expansion card with one or more serial ports to connect to RS-232 peripherals.