Universal intercom key! Opens up to 90% of the intercom: Metacom, visit, Tsifral. Universal key Doorphone is an ideal solution for employees: MIA, utilities, ambulance, cable and satellite TV, couriers and postmen. You do not need to carry around a bunch of keys, they will replace a master key to intercom. Own production (2 products keys pills + proxy key) delivery to the regions, the payment upon receipt. Sales of equipment for that I have ever heard. After all, in fact, the tablet is a hard-wired ROM key.
This memory is called Touch Memory brand DS1990A. Pill "communicates" with the intercom on the bus One-wire (single-wire interface). This bus is designed by Dallas, it allows you to talk to two or more devices of a single wire. If the device is passive (as in our case), it is also transmitted on the bus and power over a single wire. In addition to the memory of the key (tablet) is a 60 pF capacitor, which provides short-term power at the time of response.
The master must continuously generate a signal unit for charging this capacitor to the ROM in the tablet continued to eat. Discarding all the clever term, we can say simply: all that is necessary for operation of the device is only transmitted over a single wire. By the way, the 1-Wire bus has proved so successful that it held industrial networks, including in our country. The principle of universal key All this describes the general work interphone key. Our key works on the same principle. Plant manufacturer interphone systems produces a unique key code is not repeated. When installing the intercom company installer registers the keys (or rather the key code) in memory of intercom. Every time we offer a clue to the reader, intercom compares this slower than the reading of their original keys. Please note that the principle of universal key is independent of the city where you are and the company's intercom, which established and serves intercoms. Request a universal master key all-terrain vehicle in any city of Russia, with payment upon receipt, please visit