The failure of POS to connect to the server means that the local network signal is not good, and the traffic card of the POS machine is not installed properly, causing the POS machine to be unable to connect to the server.

POS (Pointofsales) means "point of sale" in Chinese, and the full name is point of sale information management system. It is a terminal reader equipped with barcode or OCR code technology and has a cash or barter limit cashier function. . Its main task is to provide data services and management functions for commodity and media transactions, and to conduct non-cash settlement. POS is a multi-functional terminal that can be installed in credit card merchants and acceptance outlets and connected to a computer network to realize automatic transfer of electronic funds. It has functions such as supporting consumption, pre-authorization, balance inquiry and transfer. Use It is safe, fast and reliable. It is difficult to obtain basic business information in bulk transactions. The introduction of POS systems is mainly to solve the blind spots of information management in the retail industry. An important part of the chain store management information system.