The RJ11 and RJ12 interface of cash drawer
RJ refers to Registered Jack, which represents registered jacks, which comes from the USOC code of the Bell system. The USOC is a series of registered jacks and their wiring. It was developed by the Bell system, and aims to connect the user's equipment to the public network.
The FCC regulations govern the application of this purpose. The FCC issued a document specifying RJ11 on behalf of the U.S. government.
RJ11 is the common name for connectors developed by Western Electric Co. Its shape is defined as a 6-pin connection device. For RJ11, the source information is contradictory. It can be a 2-pin or 4-pin 6-pin connector. What is even more confusing is that RJ11 is not only used to represent the 6-pin connector, it also refers to the 4-pin version.
RJ12 is a standard telephone crystal head (six cores).
In the cash drawer interface, RJ11 is four cores and RJ12 is six cores.
The cash drawer interface generally refers to the RJ11 and RJ12, and both the RJ11 and RJ12 can be used in a 6-pin, 6P6C jack. If the customer is not clear that RJ11 or RJ12 should be used, RJ12 is the most secure method. RJ12 interface supports micro switch. The micro switch can record the number of opening the cash drawer, because some POS machines do not have this function, so for the use of the micro switch, it has no effect on the normal use of the cash drawer by the customer.