IC card Expense machine- Downloads data communication fail

IC card Expense machine- - - > Downloads data communication fail

Settles means ——
1, Sells meal machine No. set up whether right, Downloads time also must pick out correspondence machine number in software;
2, Sets up sell meal machine 's download serial port whether right   in software; ;
3, Communicates line whether insert to right USB faucet;
4, Line whethers normal, Is like computer or Timecard recording machine deal with 's meet plug whether right, Firmness, There is become less crowded or contact bad, Ands line whether can you you turnoff   , Short;
5, Is like is RS485 's machine on network, Can first will certain move to computer side use short network line test download, Is like normal then check line, Is like line also normal, Then Chus check other network machine  。