PLC Programming Handbooks
ASCII Chart ">ASCII is the American Standard Code for Information Interchange used by all computers to standardize a number for a letter, number or code. Originally developed in 1963 and used in teletypes, modems and printers it is still used extensively in computer and PLC communications. These simple ASCII charts show the digit and symbol associated with it.
Regular ASCII Chart (character codes 0 - 127)
Extended ASCII Chart (character codes 128 - 255)