What is the difference between keyboard wedge and RS-232 interfaces?
For a keyboard wedge interface, the scanner or reader (decoder built in) connects to the keyboard port of computer, the keybard will connect to the split cable of scanner and remains fully functional. The data scanned from a bar code symbol is treated as it is typed in from the keyboard. For RS-232 interface, the scanner or reader connects to a serial port and transmits serial data to the host machine. The host must be set up to receive serial data. The RS-232 scanner or reader can be programmed for a variety of baud rates, data bits and parity in order to communicate properly with host machine. Q. What is depth of field? A: The variation in distance that a bar code can be read from a scanner is called depth of field. Q. What is the difference between Visible and Infra-red scanners (Readers)? A: The light source of scanner or reader in most cases is at around 660 nanometres wavelength, which can be seen by our eyes, this is the type of scanner of reader that comes with Vissible Light;
