M-bus water meter

the meter has two meter modes: prepay meter mode and open meter mode prepay meter mode: the user prepay water at first block price--- use water--- come to charge--- read user card in the system--- system automatically show how much the user has to pay---- user tell the operator how many water he want to prepay again---- the operator enter the volume the user want in the system---- the user pay the money and the volume will be wroten back to the card--- the user get his invoice---- the user go back home and reload the volume to his meter Open meter mode: user use water--- management company come to read his meter with handheld unit(HHU)--- upload the HHU data to PC server---- the system will automatically calculate how much the user need to pay and generate an unpaid invoice--- send the unpaid invoice to the user---- user comes to pay for the unpaid invoice. Other functions: Old Debt: use this meter to replace old normal meter, the user might was in debt for water used in old normal meter. once our meter is installed, the management company can preset the meter in prepay meter mode, and when register the user information, we can enter the old debt, so in future purchase, the user has to pay extra money for the old debt. so the management company can get the old debt back little by little. Block price: the system allows multi block price. in the system parameter setting , the opearter can preset several block valve. if the used volume of a user is paid according to each block price. say block one is 0-5M3 Unit price is $1, block two is 6-10M3 Unit price is $2, and third block is 11---- unit price is $3. if a user used 14M3, the system will calculate: 5x1+5x2+4X3=$27. Alarm level: two alarm level to remind user to reload when the remaining volume reach to alarm level Anti-rust valve: the valve will automaticall close and open three times in a month to anti rust