I am concerned about bar code interface with LPC1768/LPC1769 controller.. If I use only UART-TX, UART-RX, GND pin of controller only to interface with barcode scanner module which has UART or RS232 option( without mapping handshaking signal), i) is it possible to communicate with barcode device. ii) What should I do with RTS/CTS if they are not used.
Most barcode readers can be configured to send automatically, so you will only need the RX pin on your microcontroller.
The unused barcode reader input pins should be tied to voltages that indicate a ready state. (on rs232 this was high, so on a UART it would be low (grond)) unused outputs should be left unconnected.