Easily convert an rs232 serial signal 12 to 12v to a transistor transistor logic signal 0 to 5v this rs232 to ttl converter lets you connect devices that use rs232 serial ports to devices that only communicate using transistor transistor logic ttl signals its a convenient and cost effective solution to convert rs232 into ttl so you can connect equipment together based on your devices signal requirements this serial converter is ideal for short distance communication between two