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POS cash drawer interface RJ11 and RJ12

POS cash drawer interface RJ11 and RJ12


RJ refers to Registered Jack, which stands for Registered Jack

USOC (Universal ServiceOrdering Codes) code from Bell Systems


USOC is a series of registered jacks and their wiring, developed by Bell Systems to connect users' devices to the public network

FCC regulations govern the application for this purpose. The FCC (Federal Communications Commission) has issued a document on behalf of the US government that regulates the RJ11


RJ11 is the generic name for connectors developed by Western ElectricCo


Its shape is defined as a 6-pin connection device. Formerly known as WExW, where x means active', contact or needle

For example, WE6W has all 6 contacts, numbered 1 to 6, WE4W interface only uses the outermost two contacts (1 and 6) of 4 pins, WE2W only uses the middle two pins


For RJ11, the sources of information are conflicting, it can be a 2 or 4-pin 6-pin connector.

To add to the confusion, RJ11 isn't just used to represent a 6-pin connector, it's also a 4-pin version.

RJ12 is a standard telephone crystal head with six cores.

In the cash drawer interface, RJ11 is four-pin, RJ12 is six-pin


Brief introduction of crystal connector :


RJ45: 8-pin plug, 8P8C (8 position, 8contact), that is, 8 positions, 8 contacts

RJ12 (RJ25): 6-pin plug, 6P6C, that is, 6 positions, 6 contacts

RJ11 or RJ14 : 4-pin plug, 6P4C, 6 positions, 4 contacts, like our telephone access cords

RJ12 (R10orRJ9) : 4-pin plug (telephone handset cord), 4P4C, 4 positions, 4 contacts

RJ11, RJ14, RJ25 can be used in the same 6-pin 6P6C jack, - generally RJ11 uses 2 wires, RJ14 uses 4 wires, and RJ25 uses 6 wires

Cash drawer connectors generally involve RJ11 (6P4C, 4-pin) and RJ12 (6P6C, 6-pin), both RJ11 and RJ12 can be used in a 6-pin, 6P6C jack


If the customer does not know whether to use RJ11 or RJ12, it is the safest way to use RJ12

RJ12 interface supports micro switch. The micro switch can record the number of times the cash drawer is opened. Because some POS machines do not have this function, whether or not the micro switch is used has no effect on the normal use of the cash drawer by customers.


USB cash drawer Cable RJ11 and RJ12

POS cash drawer interface Cable RJ11 and RJ12


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