REMOTE CONTROL SYSTEM USING PASSWORD

PURPOSE:To disable the shift of operation to remote control operation at the input of a different password to remove intentional mischief by expressing the password as a continuous numerical code, determining the number of digits and numerals in respective digits by required values and setting up these values optionally in a receiving part. CONSTITUTION:Both a password memory 19 and a setting memory 20 are constituted by using a part of a RAM18 and 4-bit codes corresponding to 11 digits are prepared. The user setting up the receiving part 3 selects the number of digits and numerals within 4-10 digits optionally as the password code, turns a mode selecting switch 13 to ''SET'' and inputs numerals through a 4X3 key pad 12 to store the password in the setting storage 20. The 1st series of PB signals received by the receiving part and converted into numerals by a PB receiver 9 are stored in the password storage 19 as a left-justify code. Whether a numerical string arranged before a mark # out of the contents stored in the memory 19 completely coincides with the contents of the setting memory 20 or not is discriminated by a micro-CPU15. If the contents do not coincide completely, a remote control rejecting message is sent to a telephone line 2 and then the operation of a relay 5 is stopped.